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  • 1.
    Abrehdary, M.
    et al.
    Royal Inst Technol KTH, Div Geodesy & Satellite Positioning, S-10044 Stockholm, Sweden..
    Sjöberg, L. E.
    Royal Inst Technol KTH, Div Geodesy & Satellite Positioning, S-10044 Stockholm, Sweden..
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Royal Inst Technol KTH, Div Geodesy & Satellite Positioning, S-10044 Stockholm, Sweden..
    Modelling Moho depth in ocean areas based on satellite altimetry using Vening Meinesz-Moritz' method2016In: Acta Geodaetica et Geophysica, ISSN ISSN 2213-5812, EISSN 2213-5820, Vol. 51, no 2, p. 137-149Article in journal (Refereed)
    Abstract [en]

    An experiment for estimating Moho depth is carried out based on satellite altimetry and topographic information using the Vening Meinesz-Moritz gravimetric isostatic hypothesis. In order to investigate the possibility and quality of satellite altimetry in Moho determination, the DNSC08GRA global marine gravity field model and the DTM2006 global topography model are used to obtain a global Moho depth model over the oceans with a resolution of 1 degrees x 1 degrees. The numerical results show that the estimated Bouguer gravity disturbance varies from 86 to 767 mGal, with a global average of 747 mGal, and the estimated Moho depth varies from 3 to 39 km with a global average of 19 km. Comparing the Bouguer gravity disturbance estimated from satellite altimetry and that derived by the gravimetric satellite-only model GOGRA04S shows that the two models agree to 13 mGal in root mean square (RMS). Similarly, the estimated Moho depths from satellite altimetry and GOGRA04S agree to 0.69 km in RMS. It is also concluded that possible mean dynamic topography in the marine gravity model does not significantly affect the Moho determination.

  • 2.
    Abrehdary, Majid
    et al.
    Department of Environment and Life Sciences, Geomatics Section, University of Karlstad, Karlstad,Sweden; Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Lars, Sjöberg
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology(KTH), Sweden.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Sampietro, Daniele
    GReD s.r.l., Como, Italy.
    Towards the Moho depth and Moho density contrast along with their uncertainties from seismic and satellite gravity observations2017In: Journal of Applied Geodesy, ISSN 1862-9016, E-ISSN 1862-9024, Vol. 11, no 4, p. 231-247Article in journal (Refereed)
    Abstract [en]

    We present a combined method for estimating a new global Moho model named KTH15C, containing Moho depth and Moho density contrast (or shortly Moho parameters), from a combination of global models of gravity (GOCO05S), topography (DTM2006) and seismic information (CRUST1.0 and MDN07) to a resolution of 1° × 1° based on a solution of Vening Meinesz-Moritz’ inverse problem of isostasy. This paper also aims modelling of the observation standard errors propagated from the Vening Meinesz-Moritz and CRUST1.0 models in estimating the uncertainty of the final Moho model. The numerical results yield Moho depths ranging from 6.5 to 70.3 km, and the estimated Moho density contrasts ranging from 21 to 650 kg/m3, respectively. Moreover, test computations display that in most areas estimated uncertainties in the parameters are less than 3 km and 50 kg/m3, respectively, but they reach to more significant values under Gulf of Mexico, Chile, Eastern Mediterranean, Timor sea and parts of polar regions. Comparing the Moho depths estimated by KTH15C and those derived by KTH11C, GEMMA2012C, CRUST1.0, KTH14C, CRUST14 and GEMMA1.0 models shows that KTH15C agree fairly well with CRUST1.0 but rather poor with other models. The Moho density contrasts estimated by KTH15C and those of the KTH11C, KTH14C and VMM model agree to 112, 31 and 61 kg/m3 in RMS. The regional numerical studies show that the RMS differences between KTH15C and Moho depths from seismic information yields fits of 2 to 4 km in South and North America, Africa, Europe, Asia, Australia and Antarctica, respectively.

  • 3.
    Abrehdary, Majid
    et al.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Sjöberg, Lars E.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Combined Moho parameters determination using CRUST1.0 and Vening Meinesz-Moritz model2015In: Journal of Earth Science, ISSN 1674-487X, E-ISSN 1867-111X, Vol. 26, no 4, p. 607-616Article in journal (Refereed)
    Abstract [en]

    According to Vening Meinesz-Moritz (VMM) global inverse isostatic problem, either the Moho density contrast (crust-mantle density contrast) or the Moho geometry can be estimated by solving a non-linear Fredholm integral equation of the first kind. Here solutions to the two Moho parameters are presented by combining the global geopotential model (GOCO-03S), topography (DTM2006) and a seismic crust model, the latter being the recent digital global crustal model (CRUST1.0) with a resolution of 1A(0)x1A(0). The numerical results show that the estimated Moho density contrast varies from 21 to 637 kg/m(3), with a global average of 321 kg/m(3), and the estimated Moho depth varies from 6 to 86 km with a global average of 24 km. Comparing the Moho density contrasts estimated using our leastsquares method and those derived by the CRUST1.0, CRUST2.0, and PREM models shows that our estimate agrees fairly well with CRUST1.0 model and rather poor with other models. The estimated Moho depths by our least-squares method and the CRUST1.0 model agree to 4.8 km in RMS and with the GEMMA1.0 based model to 6.3 km.

  • 4.
    Abrehdary, Majid
    et al.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Sjöberg, Lars E.
    Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden.
    The spherical terrain correction and its effect on the gravimetric-isostatic Moho determination2016In: International Journal of Geophysics, ISSN 1687-885X, E-ISSN 1687-8868, Vol. 204, no 1, p. 262-273Article in journal (Refereed)
    Abstract [en]

    In this study, the Moho depth is estimated based on the refined spherical Bouguer gravity disturbance and DTM2006 topographic data using the Vening Meinesz-Moritz gravimetric-isostatic hypothesis. In this context, we compute the refined spherical Bouguer gravity disturbances in a set of 1° × 1° blocks. The spherical terrain correction, a residual correction to each Bouguer shell, is computed using rock heights and ice sheet thicknesses from the DTM2006 and Earth2014 models. The study illustrates that the defined simple Bouguer gravity disturbance corrected for the density variations of the oceans, ice sheets and sediment basins and also the non-isostatic effects needs a significant terrain correction to become the refined Bouguer gravity disturbance, and that the isostatic gravity disturbance is significantly better defined by the latter disturbance plus a compensation attraction. Our study shows that despite the fact that the lateral variation of the crustal depth is rather smooth, the terrain affects the result most significantly in many areas. The global numerical results show that the estimated Moho depths by the simple and refined spherical Bouguer gravity disturbances and the seismic CRUST1.0 model agree to 5.6 and 2.7 km in RMS, respectively. Also, the mean value differences are 1.7 and 0.2 km, respectively. Two regional numerical studies show that the RMS differences between the Moho depths estimated based on the simple and refined spherical Bouguer gravity disturbance and that using CRUST1.0 model yield fits of 4.9 and 3.2 km in South America and yield 3.2 and 3.4 km in Fennoscandia, respectively.

  • 5.
    Agbauduta, Stephen Ogba
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    SPATIAL MCDA FOR FINDING SUITABLE AREAS FOR HOUSING CONSTRUCTION2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Demand for residential houses in urban areas has become a major problem facing town planners today. With the high increase in urbanization due to the increase in population, residential houses are becoming more difficult to find. Planners aim at developing new ideas to combat the high increase in the demand for residential buildings. In recent times, different methods of analysis have been introduced that will help planners select best locations to erect residential houses.

    A Geographic information system (GIS) is one of the tools for analyzing and storing a great deal of information. Over the years, GIS technology has been introduced into planning and the result has been of great help to urban planners in planning sustainable environment for residents. This research aims at using GIS technology and multi-criteria decision analysis (MCDA) to determine possible locations to build residential houses and analyzing different methods of selecting suitability areas within the study area. An MCDA map was produced from the combination of different factors and constraint which include elevation, orientation of the building (direction), the soil type and land use type. Proximity analysis was also done to find out how infrastructures (existing roads, shopping malls and health care enter) are close to the study area. Results show that the southern, eastern, and a part of western side of the study area is better to build residential houses than other areas.

    Three different methods (visual interpretation method, seeding method and neighborhood method) where used to find out which method produces the most suitable locations within the study area. In order to calculate the suitability areas and suitability values, the sum of pixel values were calculated for each method. The visual interpretation method servers as a standard method of deciding the suitability area covers 15,375 m² and has the highest suitability values of about 500 pixels. The seeding method was used as an automatic method for selecting the suitability area; result shows that the suitability area covers 17,421 m² and has the highest suitability value of about 1200 pixels. The neighborhood method was calculated using two different statistics (mean statistics and majority statistics). The mean statistics covers an area of 12,439 m² while the majority statistics covers an area of 14,332 m². From analysis carried out, the seeding method is preferred for selecting suitability areas than the visual interpretation method and the neighborhood method but the visual interpretation method covers more suitability area than the seeding method and neighborhood method.

  • 6.
    Ahnberg Åsenius, Elisabeth
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Lekmöjligheter och trafiksäkerhet för barn i stadsmiljöer: Fallstudie av centrala Falun2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Small children in the age around two to ten needs space to play and move around to be able to develop, and these needs should be considered in the spatial planning practice. Unfortunely there are signs that childrens need for places to play and move around have lost in priority in spatial planning practice in Sweden the last decades. For example research shows that childrens access to public places to play at in swedish citys is reduced. Also childrens possibilities to move around freely in swedish cities are continuously reduced due to increasing traffic. It has also been noted that fewer children walk or bicycle on there own to school and bicycling in the spare time has also been declining.   

    The aim of this study has been to exmine childrens possibilities to play and move around independently in urban environment. The study is restricted to a casestudy of the city-environment Falun-Centrum. That is an area of ca 2,5 km2 predefined by Falu kommun. It contains the city-center with shops, parks, roads, residential areas, kindergardens, schools etc. Information has been collected by a postal survey sent to guardians of 100 children (about 20 % of the total number in the area) that were older than one year and younger than eleven years during 2017 living in the casestudy-area.

    The results are based on 53 answers; 39 answers to the postal survey and 14 answers to additional interwievs over telephone. The answers show that in Falun-Centrum the respondents experience that their children have quite good access to places to play at in their vicinity. Field inventory of the places showed that many of the places were spacious enough to allow vast playing and had green and varied terrain, which is good. Though, the results about the safety aspects in traffic shows that there are a lot of traffic hazards that prevent the children to move around independently in the area.

    In summary it means that the children in general have good places to play at in there vicinity (although there are exeptions), but that they can not go there on their own due to traffic hazards. The lack of traffic safety also means that the conditions for them to go to, explore and get to know new places in their surroundings are severely limited. In the long run it limits the development of their geographichal imagination of their urban surroundings. It also limits their opporunities to meet, get to know and understand other persons in the city. In the long run it inhibits the urban social sustainability.

  • 7.
    Ali, Fadi
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Urban classification by pixel and object-based approaches for very high resolution imagery2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Recently, there is a tremendous amount of high resolution imagery that wasn’t available years ago, mainly because of the advancement of the technology in capturing such images. Most of the very high resolution (VHR) imagery comes in three bands only the red, green and blue (RGB), whereas, the importance of using such imagery in remote sensing studies has been only considered lately, despite that, there are no enough studies examining the usefulness of these imagery in urban applications. This research proposes a method to investigate high resolution imagery to analyse an urban area using UAV imagery for land use and land cover classification. Remote sensing imagery comes in various characteristics and format from different sources, most commonly from satellite and airborne platforms. Recently, unmanned aerial vehicles (UAVs) have become a very good potential source to collect geographic data with new unique properties, most important asset is the VHR of spatiotemporal data structure. UAV systems are as a promising technology that will advance not only remote sensing but GIScience as well. UAVs imagery has been gaining popularity in the last decade for various remote sensing and GIS applications in general, and particularly in image analysis and classification. One of the concerns of UAV imagery is finding an optimal approach to classify UAV imagery which is usually hard to define, because many variables are involved in the process such as the properties of the image source and purpose of the classification. The main objective of this research is evaluating land use / land cover (LULC) classification for urban areas, whereas the data of the study area consists of VHR imagery of RGB bands collected by a basic, off-shelf and simple UAV. LULC classification was conducted by pixel and object-based approaches, where supervised algorithms were used for both approaches to classify the image. In pixel-based image analysis, three different algorithms were used to create a final classified map, where one algorithm was used in the object-based image analysis. The study also tested the effectiveness of object-based approach instead of pixel-based in order to minimize the difficulty in classifying mixed pixels in VHR imagery, while identifying all possible classes in the scene and maintain the high accuracy. Both approaches were applied to a UAV image with three spectral bands (red, green and blue), in addition to a DEM layer that was added later to the image as ancillary data. Previous studies of comparing pixel-based and object-based classification approaches claims that object-based had produced better results of classes for VHR imagery. Meanwhile several trade-offs are being made when selecting a classification approach that varies from different perspectives and factors such as time cost, trial and error, and subjectivity.

          Classification based on pixels was approached in this study through supervised learning algorithms, where the classification process included all necessary steps such as selecting representative training samples and creating a spectral signature file. The process in object-based classification included segmenting the UAV’s imagery and creating class rules by using feature extraction. In addition, the incorporation of hue, saturation and intensity (IHS) colour domain and Principle Component Analysis (PCA) layers were tested to evaluate the ability of such method to produce better results of classes for simple UAVs imagery. These UAVs are usually equipped with only RGB colour sensors, where combining more derived colour bands such as IHS has been proven useful in prior studies for object-based image analysis (OBIA) of UAV’s imagery, however, incorporating the IHS domain and PCA layers in this research did not provide much better classes. For the pixel-based classification approach, it was found that Maximum Likelihood algorithm performs better for VHR of UAV imagery than the other two algorithms, the Minimum Distance and Mahalanobis Distance. The difference in the overall accuracy for all algorithms in the pixel-based approach was obvious, where the values for Maximum Likelihood, Minimum Distance and Mahalanobis Distance were respectively as 86%, 80% and 76%. The Average Precision (AP) measure was calculated to compare between the pixel and object-based approaches, the result was higher in the object-based approach when applied for the buildings class, the AP measure for object-based classification was 0.9621 and 0.9152 for pixel-based classification. The results revealed that pixel-based classification is still effective and can be applicable for UAV imagery, however, the object-based classification that was done by the Nearest Neighbour algorithm has produced more appealing classes with higher accuracy. Also, it was concluded that OBIA has more power for extracting geographic information and easier integration within the GIS, whereas the result of this research is estimated to be applicable for classifying UAV’s imagery used for LULC applications.

  • 8.
    Alinazari, Shabnam
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Alvinder, Catrin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    I barn och ungas ögonhöjd: En checklista från barn till plan för detaljplanering2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Det demokratiska samhället med värderingar om allas lika rätt till inflytande har med Förenta Nationernas barnkonvention lyft frågan om barns rätt att påverka den fysiska planeringen (UNICEF, 2009). Plan- och bygglagen (PBL) gör ingen skillnad på barn eller vuxna vilket innebär att de ska ses som jämlika medborgare inom samhällsbyggnadsprocesser (SFS, 2010:900). Detta utgör den lagbestämda grunden till varför barn, precis som vuxna, ska ha samma rätt att påverka beslut som rör deras närmiljö. En barnchecklista kan tydliggöra att ett barnperspektiv tillämpas inom planeringsprocesser och frågorna utgår vanligen från vuxnas tolkningar av vad som bör innefattas (Boverket, 2000). Denna studie har uppmärksammat den brist på medverkan av barn och unga som ofta finns i planeringssammanhang och det finns därigenom utrymme för förbättringar. Studien har därför valt att fokusera på att få barnens röster hörda genom att undersöka vilka faktorer i miljön som är viktiga för dem. Detta har legat som grund till att utarbeta en ny checklista där deras värderingar varit grundläggande för frågornas utformande. För att uppnå detta anordnades workshops och enkätundersökningar med grupper av barn från lågstadiet upp till gymnasiet. Eftersom åldersspannen varierade mellan 9-18 år anpassades metoderna efter deras kognitiva förmåga.

    Resultatet från studien visade att barnen ansåg att det fanns flera faktorer i miljön som påverkar deras subjektiva upplevelse. Detta innefattade bland annat hur byggnader med dess utbredning och placering påverkar dem men även hur viktigt det är med bra gång- och cykelvägar för att främja för deras rörelsefrihet. Det betonades även hur bevarandevärden där exempelvis en enkel kulle för pulkaåkning eller en skogsdunge att busa i var viktigt att inte planera bort. Det slutgiltiga resultatet blev checklistan: Från barn till plan. Den är tänkt att fungera som ett arbetsverktyg med öppna frågor, vilket ger planeraren utrymme att belysa barnperspektivets tillämpning inom detaljplanering. Resultatet visade även på stor kunskap, intresse och medvetenhet hos barn och unga gällande den byggda miljön. De bör därför ses som självständiga kompetenta individer inom samhällsplanering med röster värda att höras.

  • 9.
    Andersson, Jacob
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Norbäck, Markus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Lokalisering av nya bostadsområden i översiktlig planering: En rumslig multikriterieanalys över Gävle2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Urbanization combined with toxic emissions from motor traffic calls forhigher demands when house planning in cities. The purpose of this study is toincrease understanding about how to apply multi criteria analyses whenmaster planning to contribute to a more sustainable society. A more effectivehouse planning connected to existing societal functions might add to the usageof more sustainable transportation alternatives rather than that of cars.

    Using the input from interviews with representatives from both the privateand the public sector, a number of criterias have been developed for theanalysis. Considering existing societal functions, this study was intended toidentify new areas for housing development using a multi criterial analysis.This might contribute to more sustainable transportation because of thedistance to the societal functions. In addition to this, the intention extended tothe investigation of how political interests differs from one another, using aranking system based on the developed criterias.

    The results show that representatives from the two largest political parties in asmall town in Sweden rank the criterias different when it comes to whatsocietal functions a new housing area should have in close proximity. On theother hand, the end results show that the areas chosen for housingdevelopment have similar qualities, in spite of varying housing politics amongthe politicians. This study might contribute to a more effective politicalhandling of business, since political differences does not ultimately showdifferences in where activities or objects should be placed.

  • 10.
    Andersson, Linda
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hedlund, Johanna
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Trivsam boendemiljö för studenter: En gestaltningsstudie utifrån studenters åsikter för ett trivsamt boende2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The physical environment is a very important component for human health.  A well-functioning site enables people to recreation and social life. People who spend a lot of time outdoor are also experiencing less stress. If people doesn’t give opportunity to influence the spatial planning process there is a risk of negative attitudes and discomfort. This can create a mental illness. This study deals with how students feel about their physical environment and how they want it to be designed. The study is aimed at students who live in one of the three different student areas in Gävle: Kungsbäck, Campus Sätra and Midgård. The study is based on three methods. These were: a questionnaire, an observation study, and a physical design study in 3D.

     

    The observations showed significant problems with the site design as only movement, who take into necessary but significant activity account. The observations showed a clear lack of both elective and social activities, both of which are important for a well-functioning place. The survey showed dissatisfaction about the site design among the students. Through this study, students were given an opportunity to share their wishes about the site's future design. The proposals were designed in 3D. Three different proposals were developed: a zero option, an economical option, and an expensive option. The zero option indicates a probable development of the area if no action takes place. The economical option indicates a solution that focus on economical sustainability. The expensive option has the highest costs both in construction and maintenance. The evaluation showed that the students liked the economical proposal option most.

     

    The result showed the importance of student participation in the planning process. Student comments through the survey and evaluation, indicated that: trees, venues, water, grass and lighting should be included in future planning frameworks for student housing.

  • 11.
    Andrée, Martin
    et al.
    Lantmäteriet.
    Larsson, Karolina
    KLM; Stockholms stad.
    Nordqvist Darell, Fanny
    Stockholms stad.
    Malm, Linus
    Tyréns.
    Tullberg, Odd
    WSP.
    Wallberg, Ann
    JM.
    Norsell, Johan
    NAI Svefa.
    Paasch, Jesper M.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Seipel, Stefan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Computer science.
    Paulsson, Jenny
    Kungliga Tekniska Högskolan, Stockholm.
    Slutrapport för projektet Smart planering för byggande: Delprojekt 3 - BIM som informationsstöd för 3D fastighetsbildning2018Report (Other academic)
    Abstract [sv]

    Samhällsbyggnadsprocessen behöver utvecklas och bli smartare, öppnare och mer effektiv för ett ökat bostadsbyggande. En digitalisering av samhällsbyggnadsprocessen kan ge ett effektivare samarbete mellan kommun, fastighetsägare, byggherrar, medborgare, näringsliv och myndigheter.Vid bildande av tredimensionellt avgränsade fastigheter eller fastighetsutrymmen (3D-fastigheter) behöver gränsernas läge redovisas både verbalt och i kartor och ritningar, detsamma gäller berörda rättigheter. Det är idag ofta svårt att korrekt redovisa en 3D-volym med enbart dagens pappersritningar och även svårt att läsa en registerkarta i 2D med fastigheter och rättigheter beslutade i 3D. Beslutsunderlagen i fastighetsbildnings-processen behöver bli mer enhetliga och entydiga samt fastighetsinformationen behöver bli återanvändningsbar i hela samhällsbyggnadsprocessen.I detta projekt har vi studerat informationsbehovet i de olika tidpunkterna under fastighetsbildningsprocessen för 3D-fastigheter med fokus på vem som är ansvarig för att tillhandahålla informationsunderlag för att identifiera krav på utformning av 3D-modeller (t.ex BIM) och 3D-stöd för fastighetsbildning.Internationellt finns det ett stort intresse och många frågeställningar gällande samspelet mellan BIM och Fastighetsinformation; det är däremot ganska få fall som har identifierats där man har arbetat praktiskt med BIM i relation till redovisning av 3D-fastigheter.Projektethar även tittat på behov av visualisering och tillhandahållande av fastighetsinformation i 3D, hur informationen bör utformas för att kunna tolkas korrekt samt nyttjas vidare av andra aktörer i samhällsbyggnadsprocessen.Slutsatsen i projektetär att en framtida arbetsmodell där man i samband med myndighetsutövningen för fastighetsbildning samverkar med stöd av BIM och geografisk information i ärendehandläggningen kan ge stora effekter på både myndighetens effektivitet och i ärendeutövningen och för förståelsen av fastighetbildningsbeslutet hos samtliga intressenter i processen. För att det arbete som genomförts i denna utredning skall få genomslag i den dagliga verksamheten rekommenderar vibland annatatt de statliga och kommunala lantmäterimyndigheterna arbetar vidare med att utveckla arbetsprocessen och rekommendationerna för 3D-fastighetsbildning baserat på resultatet från detta projekt och redan i dagens modell efterfrågar att man i handläggningsprocessen kan arbeta BIM-baserat även om kommande beslutshandlingar under en övergångsperiod fortfarande kommer att vara baserade på ritningsbilagor i 2D.

  • 12.
    Arfwidsson, Linnéa
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Warg, Alicia
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Traditionella och nya upplåtelseformer av bostadslägenheter2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essays main focus is to further develop the understanding and describe six different types of tenure. The essay investigate similarities and differences between the types of tenure on the Stockholm housing market. The most common types of leaseholds, ownership apartments, and rental apartments will be described but and also new types of leases will be described. Such as cooperative rental apartments, condominiums, low purchase price apartments and rental purchases. The latter two are new forms of types of ownership and have emerged as an attempt by developers to bring young adults and low-wage earners into the housing market.

    Firstly, The qQuestion formulations in this essay are constructed to investigate similarities and differences which exist between the different forms of submission. Secondly, the questions target what kind of current costs for housing and the non-recurrent costs for purchasing. Finally, the purposes for the introduction of the new forms of leasing.

    The study has been conducted through literature studies and also interviews with market developers. Therefore, based on the study questions, respondents have answered the basis for our presentation and discussion of a descriptive analysis of the various forms of submission.

    Based on the results of the study, it can be clarified that the rental apartments can be the most advantageous in terms of the cost. But then it is taken into account that the queue is about 10 years for getting an apartment. Further, the results indicate that individuals that has a capital and the opportunity to purchase a ownership apart, the queue isn’t a matter and the individual has an opportunity to make a profit or loss on a later sale of the residence. Taking account to amortization of loans, an ownership apartment can be most advantageous from an economic perspective. Condominiums has been found to have a relatively low fee but the monthly cost become relatively high depending on the high purchase price.

    The results of this study shows that co-operative rental apartments have been found to have a low monthly cost. But the problem is that they are bothered by a long queue and also that the individual is dependent of a input gains. The two new types of low purchase price apartments and rental purchases on the market are so newly established which makes it difficult to make an accurately interpret of their impact on the housing market today.

  • 13.
    Assefha, Sabina
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Sandell, Matilda
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Evaluation of digital terrain models created in post processing software for UAS-data: Focused on point clouds created through block adjustment and dense image matching2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Lately Unmanned Aerial Systems (UAS) are used more frequently in surveying. With broader use comes higher demands on the uncertainty in such measurements. The post processing software is an important factor that affects the uncertainty in the finished product. Therefore it is vital to evaluate how results differentiate in different software and how parameters contribute. In UAS-photogrammetry images are acquired with an overlap which makes it possible to generate point clouds in photogrammetric software. These point clouds are often used to create Digital Terrain Models (DTM). 

    The purpose of this study is to evaluate how the level of uncertainty differentiates when processing the same UAS-data through block adjustment and dense image matching in two different photogrammetric post processing software. The software used are UAS Master and Pix4D. The objective is also to investigate how the level of extraction in UAS Master and the setting for image scale in Pix4D affects the results when generating point clouds. Three terrain models were created in both software using the same set of data, changing only extraction level and image scale in UAS Master and Pix4D respectively. 

    26 control profiles were measured with network-RTK in the area of interest to calculate the root mean square (RMS) and mean deviation in order to verify and compare the uncertainty of the terrain models. The study shows that results vary when processing the same UAS-data in different software. 

    The study also shows that the extraction level in UAS Master and the image scale in Pix4D impacts the results differently. In UAS Master the uncertainty decreases with higher extraction level when generating terrain models. A clear pattern regarding the image scale setting in Pix4D cannot be determined. Both software were able to produce elevation models with a RMS-value of around 0,03 m. The mean deviation in all models created in this study were below 0,02 m, which is the requirement for class 1 in the technical specification SIS-TS 21144:2016. However the mean deviation for the ground type gravel in the terrain model created in UAS Master at a low extraction level exceeds the demands for class 1. This indicates all but one of the created models fulfil the requirements for class 1, which is the class containing the highest requirements.

  • 14.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, Sweden .
    Deformation monitoring using different least squares adjustment methods: a simulated study2016In: KSCE Journal of Civil Engineering, ISSN 1226-7988, E-ISSN 1976-3808, Vol. 20, no 2, p. 855-862Article in journal (Refereed)
    Abstract [en]

    This study aims to investigate the ability of different least squares adjustment techniques for detecting deformation. A simulated geodetic netwo rk is used for this purpose. The observations are collected using the Total Station instrument in three epochs and different least squares adjustment methods are used to analyze the simulated network. The applied methods are adjustment-byelement, using variance-covariance components and Tikhonov regularization. For numerical computation, we utilized exist geodetic network around the simulated network and the deformation (changes in the simulated network) imposes to the object using a simulator in each epoch. The obtained results demonstrate that more accurate outcome for detection of small deformation is possible by estimating variance-covariance components. The difference of the estimated and the simulated deformations in the best scenario, i.e., applying variance-covariance components, is 0.2 and 0.1 mm in x and y directions. In comparison with adjustment by element and Tikhonov regularization methods the differences are 1.1 and 0.1 in x direction and 1.4 and 1.1 mm in y direction, respectively. In addition, it is also possible to model the deformation and therefore it can be seen that how the calculated displacement will affect the result of deformation modelling. It has been demonstrated that determining reasonable variance-covariance components is very important to estimate realistic deformation model and monitoring the geodetic networks. 

  • 15.
    Bagherbandi, Mohammad
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. KTH Royal Institute of Technology, Stockholm, Sweden.
    Bai, Yongliang
    School of Geosciences, China University of Petroleum (East China), Qingdao, China.
    Sjöberg, Lars
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Tenzer, Robert
    NTIS - New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia, Plzeň, Czechia.
    Abrehdary, Majid
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Miranda, Silvia
    Departamento de Geofísica y Astronomía, FCEFN Universidad Nacional de San Juan, San Juan, Argentina.
    Sanchez, Juan M. Alcacer
    Departamento de Geofísica y Astronomía, FCEFN Universidad Nacional de San Juan, San Juan, Argentina.
    Effect of the lithospheric thermal state on the Moho interface: a case study in South America2017In: Journal of South American Earth Sciences, ISSN 0895-9811, E-ISSN 1873-0647, Vol. 76, p. 198-207Article in journal (Refereed)
    Abstract [en]

    Gravimetric methods applied for Moho recovery in areas with sparse and irregular distribution of seismic data often assume only a constant crustal density. Results of latest studies, however, indicate that corrections for crustal density heterogeneities could improve the gravimetric result, especially in regions with a complex geologic/tectonic structure. Moreover, the isostatic mass balance reflects also the density structure within the lithosphere. The gravimetric methods should therefore incorporate an additional correction for the lithospheric mantle as well as deeper mantle density heterogeneities. Following this principle, we solve the Vening Meinesz-Moritz (VMM) inverse problem of isostasy constrained by seismic data to determine the Moho depth of the South American tectonic plate including surrounding oceans, while taking into consideration the crustal and mantle density heterogeneities. Our numerical result confirms that contribution of sediments significantly modifies the estimation of the Moho geometry especially along the continental margins with large sediment deposits. To account for the mantle density heterogeneities we develop and apply a method in order to correct the Moho geometry for the contribution of the lithospheric thermal state (i.e., the lithospheric thermal-pressure correction). In addition, the misfit between the isostatic and seismic Moho models, attributed mainly to deep mantle density heterogeneities and other geophysical phenomena, is corrected for by applying the non-isostatic correction. The results reveal that the application of the lithospheric thermal-pressure correction improves the RMS fit of the VMM gravimetric Moho solution to the CRUST1.0 (improves ∼ 1.9 km) and GEMMA (∼1.1 km) models and the point-wise seismic data (∼0.7 km) in South America.

  • 16.
    Bagherbandi, Mohammad
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Eshagh, Mehdi
    Avd för naturvetenskap, lantmäteri- och maskinteknik, Institutionen för ingenjörsvetenskap, Högskolan i Väst.
    Combined Moho Estimators2014In: Geodynamics : Research International Bulletin, ISSN ISSN 2345-4997, Vol. 1, no 3, p. 1-11Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    In this study, we develop three estimators to optimally combine seismic and gravimetric models of Moho surface. The first estimator combines them by their special harmonic coefficients; the second one uses the spherical harmonic coefficients of the seismic model and use integral formula for the gravimetric one. The kernel of the integral terms of this estimator shows that a cap size of 20◦ is required for the integration, but since this integral is presented to combine the low frequencies of the gravimetric model, a low resolution model is enough for the integration. The third estimator uses the gravity anomaly and converts its low frequencies to those of the gravimetric Moho model, meanwhile combining them with those of seismic one. This integral requires an integration domain of 30◦ for the gravity anomalies but since the maximum degree of this kernel is limited to a specific degree, the use of its spectral form is recommended. The kernel of the integral involving the gravity anomalies, developed for recovering high frequencies of Moho, is written in a closed-from formula and its singularity is investigated. This kernel is well-behaving and decreases fast, meaning that it is suitable for recovering the high frequencies of Moho surface.

  • 17.
    Bagherbandi, Mohammad
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. KTH.
    Sjöberg, Lars E.
    KTH.
    Tenzer, Robert
    Wuhan University, China.
    Abrehdary, Majid
    KTH.
    A new Fennoscandian crustal thickness model based on CRUST1.0 and a gravimetric-isostatic approach2015In: Earth-Science Reviews, ISSN 0012-8252, E-ISSN 1872-6828, Vol. 145, p. 132-145Article, review/survey (Refereed)
    Abstract [en]

    In this paper a new gravimetric-isostatic crustal thickness model (VMM14_FEN) is estimated for Fennoscandia. The main motivation is to investigate the relations between geological and geophysical properties, the Moho depth and crust-mantle density contrast at the crust-mantle discontinuity. For this purpose the Bouguer gravity disturbance data is corrected in two main ways namely for the gravitational contributions of mass density variation due to the different layers of the Earth's crust such as ice and sediments, as well as for the gravitational contribution from deeper masses below the crust. This second correction (for non-isostatic effects) is necessary because in general the crust is not in complete isostatic equilibrium and the observed gravity data are not only generated by the topographic/isostatic masses but also from those in the deep Earth interior. The correction for non-isostatic effects is mainly attributed to unmodeled mantle and core boundary density heterogeneities. These corrections are determined using the recent seismic crustal thickness model CRUST1.0. We compare our modeling results with previous studies in the area and test the fitness. The comparison with the external Moho model EuCRUST-07 shows a 3.3. km RMS agreement for the Moho depth in Fennoscandia. We also illustrate how the above corrections improve the Moho depth estimation. Finally, the signatures of geological structures and isostatic equilibrium are studied using VMM14_FEN, showing how main geological unit structures attribute in isostatic balance by affecting the Moho geometry. The main geological features are also discussed in the context of the complete and incomplete isostatic equilibrium. 

  • 18.
    Bagherbandi, Mohammad
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Tenzer, Robert
    The Key Laboratory of Geospace Environment and Geodesy, School of Geodesy and Geomatics, Wuhan University, Wuhan, China.
    Comparative study of the uniform and variable Moho density contrast in the Vening Meinesz-Moritz’s isostatic scheme for the gravimetric Moho recovery2015In: International Association of Geodesy Symposia: 3rd International Gravity Field Service, IGFS 2014; Shanghai; China; 30 June 2014 through 6 July 2014 / [ed] Jin, S.G., Springer Berlin/Heidelberg, 2015Conference paper (Refereed)
    Abstract [en]

    In gravimetric methods for a determination of the Moho geometry, the constant value of the Moho density contract is often adopted. Results of gravimetric and seismic studies, however, showed that the Moho density contrast varies significantly. The assumption of a uniform density contrast thus might yield large errors in the estimated Moho depths. In this study we investigate these errors by comparing the Moho depths determined globally for the uniform and variable models of the Moho density contrast. These two gravimetric results are obtained based on solving the Vening Meinesz-Moritz’s inverse problem of isostasy. The uniform model of the Moho density contrast is defined individually for the continental and oceanic lithosphere to better reproduce the reality. The global data of the lower crust and upper mantle retrieved from the CRUST1.0 seismic crustal model are used to define the variable Moho density contrast. This seismic model is also used to validate both gravimetric solutions. Results of our numerical experiment reveals that the consideration of the variable Moho density contrast improves the agreement between the gravimetric and seismic Moho models; the RMS of differences is 5.4 km (for the uniform density contrast) and 4.7 km (for the variable density contrast).

  • 19.
    Bagherbandi, Mohammad
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Geoinformatics, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Tenzer, Robert
    School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, China .
    Sjöberg, Lars E.
    Division of Geodesy and Geoinformatics, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Abrehdary, Majid
    Division of Geodesy and Geoinformatics, Royal Institute of Technology (KTH), Stockholm, Sweden.
    On the residual isostatic topography effect in the gravimetric Moho determination2015In: Journal of Geodynamics, ISSN 0264-3707, E-ISSN 1879-1670, Vol. 83, p. 28-36Article in journal (Refereed)
    Abstract [en]

    In classical isostatic models, a uniform crustal density is typically assumed, while disregarding the crustal density heterogeneities. This assumption, however, yields large errors in the Moho geometry determined from gravity data, because the actual topography is not fully isostatically compensated. Moreover, the sub-crustal density structures and additional geodynamic processes contribute to the overall isostatic balance. In this study we investigate the effects of unmodelled density structures and geodynamic processes on the gravity anomaly and the Moho geometry. For this purpose, we define the residual isostatic topography as the difference between actual topography and isostatic topography, which is computed based on utilizing the Vening Meinesz-Moritz isostatic theory. We show that the isostatic gravity bias due to disagreement between the actual and isostatically compensated topography varies between -382 and 596 mGal. This gravity bias corresponds to the Moho correction term of -16 to 25 km. Numerical results reveal that the application of this Moho correction to the gravimetrically determined Moho depths significantly improves the RMS fit of our result with some published global seismic and gravimetric Moho models. We also demonstrate that the isostatic equilibrium at long-to-medium wavelengths (up to degree of about 40) is mainly controlled by a variable Moho depth, while the topographic mass balance at a higher-frequency spectrum is mainly attained by a variable crustal density.

  • 20.
    Baranov, Alexey
    et al.
    Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russian Federation; Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russian Federation.
    Tenzer, Robert
    Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University, Kowloon, Hong Kong.
    Bagherbandi, Mohammad
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Division of Geodesy and Geoinformatics, Royal Institute of Technology (KTH), Stockholm, Sweden.
    Combined Gravimetric–Seismic Crustal Model for Antarctica2018In: Surveys in geophysics, ISSN 0169-3298, E-ISSN 1573-0956, Vol. 39, no 1, p. 23-56Article in journal (Refereed)
    Abstract [en]

    The latest seismic data and improved information about the subglacial bedrock relief are used in this study to estimate the sediment and crustal thickness under the Antarctic continent. Since large parts of Antarctica are not yet covered by seismic surveys, the gravity and crustal structure models are used to interpolate the Moho information where seismic data are missing. The gravity information is also extended offshore to detect the Moho under continental margins and neighboring oceanic crust. The processing strategy involves the solution to the Vening Meinesz-Moritz’s inverse problem of isostasy constrained on seismic data. A comparison of our new results with existing studies indicates a substantial improvement in the sediment and crustal models. The seismic data analysis shows significant sediment accumulations in Antarctica, with broad sedimentary basins. According to our result, the maximum sediment thickness in Antarctica is about 15 km under Filchner-Ronne Ice Shelf. The Moho relief closely resembles major geological and tectonic features. A rather thick continental crust of East Antarctic Craton is separated from a complex geological/tectonic structure of West Antarctica by the Transantarctic Mountains. The average Moho depth of 34.1 km under the Antarctic continent slightly differs from previous estimates. A maximum Moho deepening of 58.2 km under the Gamburtsev Subglacial Mountains in East Antarctica confirmed the presence of deep and compact orogenic roots. Another large Moho depth in East Antarctica is detected under Dronning Maud Land with two orogenic roots under Wohlthat Massif (48–50 km) and the Kottas Mountains (48–50 km) that are separated by a relatively thin crust along Jutulstraumen Rift. The Moho depth under central parts of the Transantarctic Mountains reaches 46 km. The maximum Moho deepening (34–38 km) in West Antarctica is under the Antarctic Peninsula. The Moho depth minima in East Antarctica are found under the Lambert Trench (24–28 km), while in West Antarctica the Moho depth minima are along the West Antarctic Rift System under the Bentley depression (20–22 km) and Ross Sea Ice Shelf (16–24 km). The gravimetric result confirmed a maximum extension of the Antarctic continental margins under the Ross Sea Embayment and the Weddell Sea Embayment with an extremely thin continental crust (10–20 km).

  • 21.
    Benselfelt, Milena
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Brändström, Sophia
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Elledningars rättighetstyper; ledningsrätt, servitut och nyttjanderätt: Elbolagens och lantmäterimyndigheternas åsikter2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden is constantly developing and it means more lines in the ground, which leads to more questions about their legal rights. The electricity grid is divided into three different sizes; the core network, the regional network and the local network. The electricity grid is an important part of the infrastructure, and it should be legally protected through for example, utility easement or agreement easement.. Issues may arise about the legal rights of power lines such as when a transfer occurs, etc. Thus it is important to examine how the power lines should be legally protected.

    The purpose of the study is to examine how the electricity companies legally protect their power lines, as well as the pros and cons of the legal rights, based on the aspects of electricity companies and cadastral authorities. The purpose is also to highlight the most common issue regarding the legal rights on power lines.

    The questions that were formulated according to the purpose were:

    1. How do electricity companies legally protect their power lines?

    2. What are the pros and cons of the legal rights based on the views of electricity companies and surveyors?

    3. What is the most common problem that electric companies have about legal rights of power lines?

    By using a qualitative method in form of an interview study, the data for the study has been obtained. The interview study consisted of 16 interviews with experts from electricity companies and cadastral authorities. As the study should cover all of Sweden, electricity companies and land surveyors were selected with a geographical spread.

    The study shows that electricity companies legally protect their power lines depending on their size. The study also shows the differences between the electricity companies and the cadastral authorities ́ views on the pros and cons of the legal rights. Issues may occur depending on who owns the land where the lines are to be constructed. 

  • 22.
    Berggren, David
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Förnyelselagen, möjlighet eller hot?: Förnyelse av äldre inskrivna avtalsrättigheter, Gävle kommuns hantering av förnyelsekravet2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    According to the so-called ”förnyelselagen”, the Renewal Act, all title registration of contractual rights registered before 1 July 1968 will be de-registered from the Real Property Register, unless renewal is applied for the right no later than 31 December 2018. The aim of the degree project is to pay attention to the renewal requirement. The objective is partly to investigate how the municipality of Gävle will handle the renewal requirement, and partly to facilitate the municipality to determine for which registered rights renewal needs to be sought.

    Unnecessary registered rights cause additional work and costs at cadastral procedures and the Renewal Act is considered to be an effective tool to de-register unnecessary registered rights. At the same time, concerns have been expressed that right holders will apply for renewal for all registered rights that are affected, without investigate which of them are unnecessary. In addition, there is also a concern that the renewal requirement may be overlooked by right holders for rights that are still relevant, which can lead to legal loss.

    Three methods were used in the study. Juridical method was used to investigate the legal situation regarding what happens with registered rights that are de-registered from the Real Property Register. To study how a major right holder acts, an investigation of registered rights was made in the Real Property Register regarding the municipality of Gävle. Furthermore, interviews were conducted with representatives of the municipality concerning the work with the renewal requirement.

    A result of the juridical method is that there are four different situations when an unregistered right may end. The result of the inventory in the Real Property Register, shows that there are about 1 400 registered rights that affect the properties of the municipality. The interviews resulted in that the municipality is informed about the renewal requirement and the municipality in most cases will investigate which registered rights should be renewed.

    The first conclusion is that unregistered contractual rights currently remain valid in the same manner as registered rights, but they may end in four situations if they are not monitored by the right holder. Such protection of unregistered rights is found to be practically impossible in most cases regarding the municipality of Gävle. The other conclusion is that the municipality will investigate which registered rights that need to be renewed, therefore the risk of legal loss can be assessed as low. Finally, it can be concluded that the Renewal Act is an opportunity rather than a threat for the municipality of Gävle.

  • 23.
    Berggren, David
    et al.
    Lantmäteriet.
    Paasch, Jesper M.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Förnyelselagen - möjlighet eller hot?2018In: Samhällsbyggaren, ISSN 2000-2408, no 2, p. 38-39Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Riksdagen har beslutat att avtalsrättigheter som skrivits in i det statliga Lantmäteriets fastighetsregister före den 1 juli 1968 kommer att tas bort ur registret om inte rättighetshavaren senast den 31 december 2018 anmäler till Lantmäteriet att den ska finnas kvar. Hur arbetar rättighetshavare med förnyelsekravet och vad kan förnyelsekravet väntas få för konsekvenser?

  • 24.
    Bergström, Louise
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hjälsten, Lisa
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Förutsättningar för avgränsning av bilfri zon: Exemplifierat i Gävle stad2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Car-free zones are a planning strategy that strives for a sustainable urban environment, focusing on reducing car use in people's everyday lives. The purpose of this study has been to investigate what preconditions that have been taken into account when defining car-free zones, to find out how car-free zones are to be delimited in Swedish cities. The aim of the study was to identify which preconditions that are important when designing a car-free zone. Then the preconditions were applied in Gävle to exemplify where a car-free zone is possible and optimal for the municipality of Gävle.

    The study was carried out with two methods to determine the conditions for the delimitations of car-free zones. First, a qualitative content analysis of four existing and planned car-free zones was carried out through an inductive approach to planning documents, reports, scientific articles, books and organizations' websites. The existing and planned car-free zones were the pedestrian street Ströget, Helsinki, Oslo and the district Vauban. Thereafter four semi-structured interviews were conducted. The interviewees were traffic planners from Gävle Municipality, Sundsvall Municipality, Umeå Municipality and Eskilstuna Municipality. Preconditions emerging from the content analysis and interviews were shown in themed tables to compare the preconditions emerged from the two methods. A comparison between the content analysis and the interviews identified nine preconditions. These nine preconditions are density, trade, public buildings, green spaces, meeting places, cycle paths, public transport, walk paths and multistory car parks. The preconditions were applied to an orthophoto of Gävle in ArcMap 10.6 to illustrate where a car-free zone is possible and most optimal to implement in Gävle city. The application of the preconditions resulted in an area that centered in central Gävle

  • 25.
    Björinder, Elin
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Ekegårdh, Adeline
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Förebyggande åtgärder för att försäkra en god luftkvalitet i samband med exploatering2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Luftföroreningar är ett växande problem i urbana miljöer på grund av förändrad markanvändning och förtätning av städer. Den huvudsakliga utsläppskällan till luftföroreningar i stadsmiljö är biltrafiken, som bland annat bidrar till höjda halter av luftburna partiklar och kvävedioxid (NO2) i luften. Dessa två luftföroreningar har stor påverkan på människors hälsa. För att reducera överskridande miljökvalitetsnormer, kan kommuner tvingas ta fram åtgärdsprogram. Syftet med denna studie var att påvisa effektiviteten av att införa så kallade förebyggande åtgärder i samband med exploateringsprojekt, oavsett om ett område riskerar att överskrida miljökvalitetsnormerna eller inte, för att på så sätt skapa en bättre luftkvalitet. För att visa på hur förebyggande åtgärder kan se ut i en tätort har exempelområdet Bomhus i Gävle använts där Gävle kommun har för avsikt att utveckla ett område med bostäder och vägar (se figur 1 för det avgränsade området).

    Metoden för denna studie har varit en litteraturstudie och två framtida scenarioanalyser, vilka inkluderar gestaltningsförslag. Litteraturstudien grundar sig i vetenskapliga artiklar, åtgärdsprogram, examensarbeten och myndighetsrapporter, där åtgärder för att reducera halter av partiklar och kvävedioxid undersöktes. Vi har sedan baserat antaganden av framtida scenarioanalyser på litteraturstudien. Åtgärderna har analyserats och kvantifierats för att sedan redovisa konkreta, realistiska och kostnadseffektiva förebyggande åtgärder i exempelområdet Bomhus. Framtagandet av kvantifieringar på luftkvalitetsvärden och åtgärder har legat till grund för att beräkna de samhällsekonomiska kostnaderna i samband med exploatering. För att visualisera förslag på förebyggande åtgärder skapades ett gestaltningsförslag.

    Resultatet visade på att införande av förebyggande åtgärder i exempelområdet Bomhus i Gävle kan bidra till en förbättrad luftkvalitet. Alla åtgärder kunde inte kvantifieras, men litteraturstudiens resultat visade på att tidigare framtagna åtgärder har gett en minskning av luftföroreningar, vilket antas göra detsamma även i Bomhus. Utifrån resultatet anser vi att analysen av införandet av förebyggande åtgärder utgör stor vikt i planeringsprocessen och bör tas fram av kommuner och byggherrar i ett tidigt skede i stadsplaneringen, eftersom att kostnader kan bli stora om luftföroreningarna ökar, oavsett halt. Kommuner ska med hjälp av kostnadsanalyser kunna bedöma om förebyggande åtgärder är samhällsekonomiskt effektiva att tillämpa i en tätort.

  • 26.
    Björklund, Emil
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Uppdatering av den svenska nationella höjdmodellen: Förutsättningar för att använda mobil laserskanning2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this study the prerequisites for using data collected using mobile laser scanning are investigated for updating the Swedish national elevation model. In 2016, the Swedish Transport Administration started a project where information from the road network is collected with mobile laser scanning. The National Land Survey of Sweden has gained access to data from this project and wants to investigate the possibilities of using data from mobile laser scanning to update the national elevation model.

    The prerequisites for using data from mobile laser scanning to update the national elevation model is investigated by examining the deviation against measured control points, comparing height deviation between data from the national elevation model and mobile scanned laser data, as well as studying the distribution and completeness of data from the mobile laser scan is compared to the changed areas it is supposed to replace.

    The result shows a low deviation in height to the control points of 1.2 centimeter in mean deviation. The grid comparison also shows a low deviation in height, mean deviation -2.4 cm. The classification of the point cloud from mobile laser scanning shows problems in dense vegetation where there are no returns from the ground, which, along with restrictions on the spread of mobile laser scanning, impose restrictions on areas that can be updated. It is primarily the lack of ground points in the point cloud and that the point cloud does not fully cover the changed areas that limit the ability to use data from mobile laser scanning to update the National Elevation Model.

  • 27.
    Björklund, Leo
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Kommunernas prissättning av kommunal mark vid markanvisningar för bostäder: En granskning av Gävle kommun och Stockholm kommun2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden is currently suffering from a major shortage of housing because the number of houses can’t satisfy the demand. To solve the problem more houses needs to be built. In the first half of 2016 approximately 21 000 new houses were built and another 28 000 got started. Before the builders can start the construction of the new houses, there need to be suitable land to build on.

    The municipalities own a large part of the land that is suitable for residential purposes, which means that the builder often are dependant on municipal land. All municipalities who answered the question, in the 2016 housing market survey, if they own suitable land for housing replied “Yes”.

    There are three main questions that will be answered in this paper:

    A. How do the municipalities price land for the construciton of apartmentbuildnings?

    B. How does quality requirements affect the land price and how are theserequirements checked by the municipality?

    C. How does the land price differ between bid and fixed priced landallocations?

    To answer these questions a few different methods have been used. The first method was to review the municipal policy for land allocation which they are requeired by law to have. There were also a review done of land allocation agreements, some that were sold by bid and some that were sold with a fixed price. Finally interviews were performed with questions based on the previously done reviews.

    Through the methods performed, the questions were answered. Both municipalities gives the land a value of SEK/sqm gross area where basements and cold areas are excluded. One difference is that Gävle uses external valuators while Stockholm has two internal units that performs the valuations of the land.

    This work showed that neither of the municipalies have a clear method of following up on the quality requirements. During the interviews it was explained that most of the requirements were tied to the building permits validity.

    The review of the land allocation agreements showed that 4 out of 5 land allocations that were made by bid were priced higher then thoose with a fixed price. It may therefore be of interest to further investigate the question.

  • 28.
    Blomkvist, Jacob
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Centrumutveckling i en småstad: Förbättrad social hållbarhet i Smedjebacken2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many small municipalities, in contrast to larger centers, struggle to offer natural social venues in their neighborhoods. As people choose larger cities for social gatherings, smaller city centers becoming depopulated and in turn they lose their necessary demand to sustain social meeting places. The purpose of this work is to see what small towns can do to make social spaces more attractive and vibrant and thereby encourage people to participated more in the public realm. This study will focus on Smedjebacken (Sweden) municipality's urban development and present proposals for measures that the municipality can take to become more socially sustainable from a planning perspective.

    The work is much based on Kevin Lynch and Jan Gehl's theories. Where Lynch's scientific strategies see the great perspective of how the city is built and Gehl's ideologies are at a more detailed level where the residents meetings in the city are the primary.

    A case study has been conducted to gather information about past and future strategies concerning Smedjebacken's city center, as well as documents, ideas and views of municipal official and knowledgeable persons through interviews. A Lynch-based observation analysis of central parts of the city was also used. The method is based on theories in Lynch’s The image of the city, Lynch argues that people see five critical elements in cities: paths, edges, districts, nodes and landmarks. This analysis was conducted during two days in Smedjebacken’s city center.

    The results show that Smedjebacken has several improvement points in order to increase the social sustainability in the city center. The city is divided into three major districts and has an incoherent character, which means that the few shops and social venues in the city are dispersed and do not benefit from one another as a result. In order to fuse the core of the city, recommendations based on Jan Gehl's theories are advanced. The key strategy recommended is to create social meetings that encourage residents to visit and participate in their community center.

  • 29.
    Bolin, Frida
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hellström, Kristin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Nedlagda järnvägar: Intresse och avveckling för annan markanvändning2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Railways are of major importance in today´s society and it also affects land usebecause land needs to be claimed to form property for railways. In Swedenthere is currently several disused railways that no one manages. This since thebusiness that once was active is no longer existing. The Swedish Transportadministration has the opinion that railways that not are in use today are achallenge to society because maintenance and care is overlooked. The purposeof the study is to investigate whether there is an interest in using the landwhere disused railways are located for other purpose. The study will alsoshow how land use can be changed in the most efficient way. The aim of thestudy is that it will result in new knowledge in the subject and thus contributeto sustainable social development.A literature study has been made to see what was previously written about thesubject. Some of the scientific papers studied indicate that these disusedrailways are not just a challenge in Sweden, there are also a challenge inseveral other countries in the world. As previous literature on the subject islimited, this study is important for contributing new knowledge on thesubject.To find out if there is an interest in using the land and how to change land useeffectively, a research method has been carefully chosen. Qualitativeinterviews have been conducted with experts in the subject, municipalities, anon-profit organization as well as landowners that are affected or have beenaffected by disused railways.The result of the study shows that there is an interest in using disusedrailways, both from a general and an individual point of view. The result hasalso shown that land use change among other things, most effective throughpurchase, property regulation or the formation of a community facilitydepending on land use. The laws applicable are, Land code, Real property lawand construction law.

  • 30.
    Borghero, Cecilia
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Feasibility study of dam deformation monitoring in northern Sweden using Sentinel1 SAR interferometry2018Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Dams are man-made structures that in order to keep functioning and to be considered structurally healthy need constant monitoring. Assessing the deformation of dams can be time consuming and economically costly.

    Recently, the technique of Interferometric Synthetic Aperture Radar (InSAR) has proved its potential to measure ground and structural deformation. This geodetic method represents a cost-effective way to monitor millimetre-level displacements and can be used as supplemental analysis to detect movements in the structure and its surroundings.

    The objective of this work is to assess the practicality of the method through the analysis of the surface deformation of the Ajaure dam located in northern Sweden, in the period 2014-2017, using the freely available Sentinel-1A images. The scenes, 51 in ascending and 47 in descending mode, were processed exploiting the Persistent Scatterer (PS) technique and deformation trends, and time series were produced.

    Built in the 60’s, the Ajaure embankment dam is considered as high consequence, meaning that a failure would cause socio-economic damages to the communities involved and, for this reason, the dam needs constant attention. So far, a program of automatic measurements in situ has been collecting data, which have been used partly to compare with InSAR results.

    Results of the multi temporal analysis of the limited PS points on/around the dam show that the dam has been subsiding more intensely toward the centre, where maximum values are of approximately 5 ± 1.25 mm/year (descending) and 2 ± 1.27 mm/year (ascending) at different locations (separated of approximately 70 m). Outermost points instead show values within -0.7 and 0.9 mm/year, describing a stable behaviour. The decomposition of the rate has furthermore revealed that the crest in the observation period has laterally moved toward the reservoir.

    It has been observed that the operation of loading and unloading the reservoir influence the dam behaviour. The movements recorded by the PS points on the dam also correlate with the air temperature (i.e. seasonal cycle).

    The research revealed that the snow cover and the vegetation could have interfered with the signal, that resulted in a relative low correlation. Therefore, the number of PS points on and around the dam is limited, and comparison with the geodetic data is only based on a few points. The comparison shows general agreement, showing the capacities of the InSAR method.

    The study constitutes a starting point for further improvements, for example observation in longer period when more Sentinel1 images of the study area are collected. Installation of corner reflectors at the dam site and/or by use of high resolution SAR data is also suggested.

  • 31.
    Borén, Cecilia
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Lämplighetsbedömning vid 3D-fastighetsbildning: Hur bedömningen av lämpliga förvaltningsobjekt görs med hänsyn till storlek och andra påverkande faktorer2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays it can be seen that smaller and smaller 3D-property units are formed. To form 3D-property units the property formation procedure must have undergone an assessment of suitability where the general suitability conditions in the third chapter of the Property Formation Act should be taken into account. The legislative history and the commentary of the Property Formation Act speak of that the 3D-property units formed should be suitable management objects and be of palpable size. The size perspective on the 3D-property units has, in some cases, been proven challenging to assess for the cadastral authority.

    This study examines how the assessment of suitable management objects is performed and how the assessment can be affected by other factors. To achieve this, a survey, interviews and a study of property information procedure dossiers have been done. The study of dossiers shows that it is difficult to see reasons to why the 3D-property unit has been considered suitable. The survey and interviews show that the assessment is done with the 3D-property unit’s purpose and independence in mind. The independence is dependent on that the 3D-property unit can operate without too many rights, be economically stable and function alone from a management perspective. The size is only of small significance when it comes to the assessment.

    Conclusion is that the suitability for each management object, the 3D-property units, is done according to the general suitability conditions of the third chapter of the Property Formation Act, where the size doesn’t have an impending significance. However, other factors can affect the assessment; factors that are taken into account individually in each 3D-case.

  • 32.
    Brandt, S. Anders
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Lim, Nancy J.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Visualising DEM-related flood-map uncertainties using a disparity-distance equation algorithm2016In: IAHS-AISH Proceedings and Reports / [ed] A. H. Schumann, G. Blöschl, A. Castellarin, J. Dietrich, S. Grimaldi, U. Haberlandt, A. Montanari, D. Rosbjerg, A. Viglione, and S. Vorogushyn, Göttingen: Copernicus Publications on behalf of International Association of Hydrological Sciences (IAHS) , 2016, Vol. 373, p. 153-159Conference paper (Refereed)
    Abstract [en]

    The apparent absoluteness of information presented by crisp-delineated flood boundaries can lead tomisconceptions among planners about the inherent uncertainties associated in generated flood maps. Even mapsbased on hydraulic modelling using the highest-resolution digital elevation models (DEMs), and calibrated withthe most optimal Manning’s roughness (n) coefficients, are susceptible to errors when compared to actual floodboundaries, specifically in flat areas. Therefore, the inaccuracies in inundation extents, brought about by thecharacteristics of the slope perpendicular to the flow direction of the river, have to be accounted for. Instead ofusing the typical Monte Carlo simulation and probabilistic methods for uncertainty quantification, an empiricalbaseddisparity-distance equation that considers the effects of both the DEM resolution and slope was used tocreate prediction-uncertainty zones around the resulting inundation extents of a one-dimensional (1-D) hydraulicmodel. The equation was originally derived for the Eskilstuna River where flood maps, based on DEM dataof different resolutions, were evaluated for the slope-disparity relationship. To assess whether the equation isapplicable to another river with different characteristics, modelled inundation extents from the Testebo Riverwere utilised and tested with the equation. By using the cross-sectional locations, water surface elevations, andDEM, uncertainty zones around the original inundation boundary line can be produced for different confidences.The results show that (1) the proposed method is useful both for estimating and directly visualising modelinaccuracies caused by the combined effects of slope and DEM resolution, and (2) the DEM-related uncertaintiesalone do not account for the total inaccuracy of the derived flood map. Decision-makers can apply it to alreadyexisting flood maps, thereby recapitulating and re-analysing the inundation boundaries and the areas that areuncertain. Hence, more comprehensive flood information can be provided when determining locations whereextra precautions are needed. Yet, when applied, users must also be aware that there are other factors that caninfluence the extent of the delineated flood boundary.

  • 33.
    Brandt, Sven Anders
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Modeling and visualizing uncertainties of flood boundary delineation: algorithm for slope and DEM resolution dependencies of 1D hydraulic models2016In: Stochastic environmental research and risk assessment (Print), ISSN 1436-3240, E-ISSN 1436-3259, Vol. 30, no 6, p. 1677-1690Article in journal (Refereed)
    Abstract [en]

    As flood inundation risk maps have become a central piece of information for both urban and risk management planning, also a need to assess the accuracies and uncertainties of these maps has emerged. Most maps show the inundation boundaries as crisp lines on visually appealing maps, whereby many planners and decision makers, among others, automatically believe the boundaries are both accurate and reliable. However, as this study shows, probably all such maps, even those that are based on high-resolution digital elevation models (DEMs), have immanent uncertainties which can be directly related to both DEM resolution and the steepness of terrain slopes perpendicular to the river flow direction. Based on a number of degenerated DEMs, covering areas along the Eskilstuna River, Sweden, these uncertainties have been quantified into an empirically-derived disparity distance equation, yielding values of distance between true and modeled inundation boundary location. Using the inundation polygon, the DEM, a value representing the DEM resolution, and the desired level of confidence as inputs in a new-developed algorithm that utilizes the disparity distance equation, the slope and DEM dependent uncertainties can be directly visualized on a map. The implications of this strategy should benefit planning and help reduce high costs of floods where infrastructure, etc., have been placed in flood-prone areas without enough consideration of map uncertainties.

  • 34.
    Carrillo, Emilio
    et al.
    Departament de Geoquímica, Petrologia i Prospecció Geològica, Universitat de Barcelona, Barcelona, Spain; School of Geological Sciences and Engineering, Yachay Tech University, San Miguel de Urcuquí, Ecuador.
    Koyi, Hemin
    Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
    Nilfouroushan, Faramarz
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Lantmäteriet, Gävle, Sweden.
    Structural significance of an evaporite formation with lateral stratigraphic heterogeneities (Southeastern Pyrenean Basin, NE Spain)2017In: Marine and Petroleum Geology, ISSN 0264-8172, E-ISSN 1873-4073, Vol. 86, p. 1310-1326Article in journal (Refereed)
    Abstract [en]

    We run a series of analogue models to study the effect of stratigraphic heterogeneities of an evaporite formation on thin-skinned deformation of the Southeastern Pyrenean Basin (SPB; NE Spain). This basin is characterized by the existence of evaporites, deposited during the Early-Middle Eocene with lateral variations in thickness and lithological composition. These evaporites are distributed in three lithostratigraphic units, known as Serrat Evaporites, Vallfogona and Beuda Gypsum formations and acted as décollement levels, during compressional deformation in the Lutetian. In addition to analogue modeling, we have used field data, detailed geological mapping and key cross-sections supported by seismic and well data to build a new structural interpretation for the SPB. In this interpretation, it is recognized that the basal and upper parts of the Serrat Evaporites acted as the main décollement levels of the so-called Cadí thrust sheet and Serrat unit. A balanced restoration of the basin indicates that thrust faults nucleated at the stratigraphic transition of the Serrat Evaporites (zone with lateral variations of thickness and lithological composition), characterized by a wedge of anhydrite and shale. The analogue models were setup based on information extracted from cross-sections, built in two sectors with different lithology and stratigraphy of the evaporites, and the restored section of the SPB. In these models, deformation preferentially concentrated in areas where thickness change, defined by wedges of the ductile materials, was inbuilt. Based on the structural interpretation and model results, a kinematic evolution of the SPB is proposed. The kinematic model is characterized by the generation of out-of-sequence structures developed due to lateral stratigraphic variations of the Serrat Evaporites. The present work shows a good example of the role of stratigraphic heterogeneities of an evaporite formation which acts as décollement level on structural deformation in a fold-thrust belt. The results of this work have implications for hydrocarbon exploration and are relevant for studying structural geometry and mechanics in shortened evaporite basins.

  • 35.
    Chen, Yanguang
    et al.
    Department of Geography, College of Urban and Environmental Sciences, Peking University, Beijing, China.
    Jiang, Bin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hierarchical scaling in systems of natural cities2018In: Entropy, ISSN 1099-4300, E-ISSN 1099-4300, Vol. 20, no 6, article id 432Article in journal (Refereed)
    Abstract [en]

    Hierarchies can be modeled by a set of exponential functions, from which we can derive a set of power laws indicative of scaling. The solution to a scaling relation equation is always a power law. The scaling laws are followed by many natural and social phenomena such as cities, earthquakes, and rivers. This paper reveals the power law behaviors in systems of natural cities by reconstructing the urban hierarchy with cascade structure. Cities of the U.S.A., Britain, France, and Germany are taken as examples to perform empirical analyses. The hierarchical scaling relations can be well fitted to the data points within the scaling ranges of the number, size and area of the natural cities. The size-number and area-number scaling exponents are close to 1, and the size-area allometric scaling exponent is slightly less than 1. The results show that natural cities follow hierarchical scaling laws very well. The principle of entropy maximization of urban evolution is then employed to explain the hierarchical scaling laws, and differences entropy maximizing processes are used to interpret the scaling exponents. This study is helpful for scientists to understand the power law behavior in the development of cities and systems of cities. © 2018 by the authors.

  • 36.
    Cooke, Sarah
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Using remote sensing and aerial archaeology to detect pit house features in Worldview-2 satellite imagery.: A case study for the Bridge River archaeological pit house village in south-central British Columbia, Canada.2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It is well known that archaeological sites are important sources for understanding past human activity. However, those sites yet to be identified and further investigated are under a great risk of being lost or damaged before their archaeological significance is fully recognized. The aim of this research was to analyze the potential use of remote sensing and aerial archaeology techniques integrated within a geographic information system (GIS) for the purpose of remotely studying pit house archaeology. As pit house archaeological sites in North America have rarely been studied with a focus in remote sensing, this study intended to identify these features by processing very high resolution satellite imagery and assessing how accurately the identified features could be automatically mapped with the use of a GIS. A Worldview-2 satellite image of the Bridge River pit house village in Lillooet, south-central British Columbia, was processed within ArcGIS 10.1 (ESRI), ERDAS Imagine 2011 (Intergraph) and eCognition Developer 8 (Trimble) to identify spatial and spectral queues representing the pit house features. The study outlined three different feature extraction methods (GIS-based, pixel-based and object-based) and evaluated which method presented the best results. Though all three methods produced similar results, the potential for performing object-based feature extraction for research in aerial archaeology proved to be more advantageous than the other two extraction methods tested.

  • 37.
    Dalheimer, Jan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Transformation av geodetiska höjdnät med flygburen laserskanning: En inledande genomförbarhetsstudie2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When the requirements on accuracy and precision are high for geodetic measurements you need geodetic reference systems realized with geodetic control networks of high quality. Today, establishment and transformation to higher order reference systems for height usually uses terrestrial methods like levelling. While highly accurate these result in time consuming work. There have been a couple attempts at using other methods for this task, for example GNSS, but another possibility might be usage of point clouds from airborne laser scanning.

    As a starting point for further studies this study attempts to use point clouds to transform a geodetic height network in Sandviken municipality, Sweden. The network consists of around 500 benchmarks and has been transformed to the national reference system for height, RH2000, by the Swedish national geodetic survey (Lantmäteriet) in 2010. The point cloud used is also produced by Lantmäteriet and is said to have a mean error of 0,05 m. This is relatively high since the requirements usually are in the millimeter range when determining transformation parameters, but if the transformation only consist of a single height shift calculated as a mean from several height shifts derived from the point cloud any random errors in the point cloud should be reduced.

    By measuring the height difference between benchmarks and points on the ground, that through different methods are given heights according to the point cloud, heights of the benchmarks have been determined according according to the point cloud. These can be compared to heights in RH2000 according to the transformation performed by Lantmäteriet to see their deviation from the assumed true value. Further comparisons against the older local heights of the benchmarks give a height shift that can be used as a simple transformation. By calculating a mean and uncertainty an estimation of the suitability of the method can be achieved.

    The all height shifts deviated a few millimeters from the result Lantmäteriet got, with uncertainties around 3 mm for the overall best method. Even if the uncertainty of the shift and therefore the transformation ended up somewhat high compared to what Lantmäteriet achieved it is still believed that point clouds may be or become a viable alternative. Especially in more remote regions without good connections to the higher order network. There are many parameters that have not yet been explored though, as well as some potential systematic errors that should be further investigated.

  • 38.
    Dimopooulou, Efi
    et al.
    School of Rural and Surveying Engineering, National Technical University of Athens, Zografou, Greece.
    Karki, Sudarshan
    Queensland Government, Department of Natural Resources and Mines, Brisbane, Australia.
    Roić, Miodrag
    Faculty of Geodesy, University of Zagred, Zagreb, Croatia.
    Duarte de Almeida, José-Paulo
    Geomatic Engineering Laboratory, Department of Mathematics, Faculty of Science & Technology, University of Coimbra, Coimbra, Portugal.
    Griffith-Charles, Charisse
    epartment of Geomatics Engineering and Land Management, Faculty of Engineering, The University of the West Indies, St. Augustine, Trinidad and Tobago.
    Thompson, Rod
    Department OTB, Section GIS - technology, Faculty of Architecture and the Built Environment, Delft University of Technology, Delft, The Netherlands.
    Ying, Shen
    School of Resource and Environmental Sciences, Wuhan University, Wuhan, China.
    Paasch, Jesper M.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Oosterom, Peter van
    Department OTB, GIS Technology Section, Faculty of Architecture and the Built Environment, Delft University of Technology, Delft, the Netherlands .
    Chapter 2. Initial Registration of 3D Parcels2018In: Best Practices 3D Cadastres - Extended version / [ed] Peter van Oosterom, Copenhagen, Denmark: International Federation of Surveyors , 2018, p. 67-94Chapter in book (Refereed)
    Abstract [en]

    Registering the rights of a 3D parcel should provide certainty of ownership, protection of rights and unambiguous spatial location. While not all cadastral jurisdictions in the world maintain a digital cadastral database, the concepts of such registration hold true regardless of whether it is a paper-based cadastre or a digital one. Similarly, the motivations and purpose for the creation of a 2D cadastre for individual jurisdictions applies to3D cadastre as well. It provides security of ownership for3D parcels, protects the rights of the owners, and provides valuable financial instruments such as mortgage, collateral, valuation and taxation. The current life cycle of the development of a land parcel includes processes startfrom outside the cadastral registration sphere, such as zoning plans and permits, but has a direct impact on how a certain development application is processed. Thus, in considering the changes required to allow a jurisdiction to register 3D, it is important to note the sphere of influence that could have an impact on 3D registration. These include planners, notaries, surveyors, data managers and registrars; however for the purpose of this paper, the research is focused on the core 3D aspects that are institutional, legal and technical. This paper explores approaches and solutions towards the implementation of initial 3D cadastral registration, as derivedby current procedures of registration of 3D parcels in various countries worldwide. To this end, the paper analyses the categorisations and approaches of3D spatial units and examines the validation requirements (constraints) on a cadastral database, at various levels of maturity. In this view, 3D data storage and visualization issues are examined in relation to the level of complexity of various jurisdictions, as provided by the results of the country inventory combined with a worldwide survey in 2010 and updated in 2014 (Van Oosterom, et al., 2014). It appearsthat significant progress has been achieved in providing legal provisions for the registration of 3D cadastres in many countries and several have started to show 3D information on cadastral plans such as isometric views, vertical profiles or text environment to facilitate such data capture and registration. Moreover, as jurisdictions progress towards an implementation of 3D cadastre, much 3D data collected in other areas (BIM, IFC CityGML files, IndoorGML, InfraGML and LandXML) open up the possibility of creating 3D cadastral database and combining with the existing datasets.The usability, compatibility and portability of these datasets is a low cost solution to one of the costliest phases of the implementation of 3D cadastres, which is the initial 3D data capture.

  • 39.
    Eby Palm, Sara
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Gentrifiering i förtätningsdiskursen: En kritisk diskursanalys av plandokument och mötesprotokoll från Gävle kommun2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Urban densification has become a prevalent strategy of city planning in Sweden. Urban intensification is also a strategy which, according to Bunce (2018), Rådberg (2014) and the Swedish National Board of Housing, Building and Planning (2016a, 2016b) runs the risk of resulting in gentrification. The Swedish National Board advices that gentrification should be considered when urban densification is implemented in central areas (Boverket, 2016a, 2016b). In what way do Swedish municipalities address the issue in their city planning? This Bachelors Degree essay is an attempt at beginning to answer that question. The study applies discourse analysis and takes the form of a case study of the municipality of Gävle. It focuses on central urban densification for housing purposes, and studies excerpts from planning documents on different geographical scales, combined with protocol from municipal policy meetings. All materials used are within the public domain. The study uses three different definitions of gentrification (Hamnett, 2003; Marcuse, 2015; Boverket 2016a, 2016b). Combining different methods of discourse analysis, the study pinpoints any discussion regarding gentrification or its synonyms, as well as the overall themes and values present within the text. The study finds that gentrification is sparingly mentioned within the material, and in addition notes that social consequences are predominantly described as being positive. The findings are compared to definitions of silence (Huckin, 2002; Kurzon, 2007), and to Huckin’s (2002) criteria for manipulative silence. The study concludes that the absence of gentrification and of negative social impact within the discourse qualifies as silence, and that this silence fits the criteria for manipulative silence. It is speculated that the silence may be caused by a combination of urban planning ideals, pressure to prepare for a large number of dwellings, and demands made by the laws that regulate urban planning. Further study is recommended to broaden the studied discourse and to examine the cause of the silence found in this study.

  • 40.
    Ederyd, Julia
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hägg, Sara
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hur kan ekosystemtjänster bevaras i urbana områden?: En studie om Grönytefaktor2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    We need to be proactive when it comes to planning our cities to meet the challenges that arrive with rapid and increasing urbanization. It’s important to preserve biodiversity and ecosystem services in a rapidly growing city since they have a great positive effect on our environment. The sustainable city can be defined through a valuation, quantification and identification of the ecological values and ecosystems in the urban area. One approach to quantify important socio-ecological ecosystem services is to calculate an areas eco-effective surfaces by using the Biotope Area Factor (BAF) tool.This study aim to increase the knowledge of how ecosystem services can be included in the planning process to create a sustainable city- and living environment. The goal of this study is to explore the requirements of BAF in the planning process since it’s important to assure and preserve ecosystem services in urban areas. The study is a comparative case study that includes a BAF-calculation with GIS and an analysis of the courtyards in three blocks in the suburb Hammarby Sjöstad, Stockholm. The result is then compared with three cityblocks in Norra Djurgårdsstaden, Stockholm. Interviews with experts are also included to give the study legitimacy. The result shows that the BAF-value does not differ between the chosen blocks in the districts, although the balancing was very low in Hammarby Sjöstad compared to Norra Djurgårdsstaden. The result also showed that the experince of the courtyard does not correspond to the achieved BAF-value and that the BAF-tool used in this study has developing potential. The BAF-tool is initially a good tool too enhance issues about ecosystem services but in the longterm we need to build and plan differently compared to how we build and plan today. This study has therefor resulted in ten criterias that should be considered when planning in space limited urban areas to enhance ecosystem services in the city.

  • 41.
    Edholm, Felicia
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Classon, Sofie
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Utvärdering av terrester laserskanning som metod vid exteriör dokumentation av Hälsingegårdar2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Due to changed air humidity, wooden houses can be affected negatively by for example deformations and settlements. Hälsingland farms (Hälsingegårdar) are a number of old homesteads, of which seven are listed at UNESCO’s World Heritage List. The wooden buildings at Hälsingland farms reflect the building techniques from the 18 and 19th century in Hälsingland province and are therefore of value both economically and culturally. To preserve the buildings in their original condition and to pass down the knowledge of the building techniques there is need of accurate documentation. Accurate documentation is possible through three-dimensional models created by, for example, terrestrial laser scanning. The aim of this study has been to develop recommendations for documentation of wooden buildings, such as Hälsingland farms, with terrestrial laser scanning and to create the base for future deformation investigations on Slåttagården, a Hälsingland farm.

    Terrestrial laser scanning was carried out in April 2017 at Slåttagården. With Global Navigation Satellite Systems (GNSS) receiver, five points on the ground were measured to establish a reference network. A number of control and check points were measured with a total station on and around the main building. The control points were marked with spherical targets. After the laser scanning was completed, the point clouds were registered in two different ways, with cloud-to-cloud registration and target-to-target registration. Then the point clouds were georeferenced into the external reference system. The position uncertainty was controlled in the software Cyclone by comparison between check points and modelled planes from the georeferenced point cloud.

    Registration and position uncertainties for the two registration methods differ marginally, which indicates that the use of targets in TLS projects similar to this study is not necessary. TLS is limited by the fact that it is a terrestrial technology and therefore needs to be supplemented with other documentation technologies, such as Unmanned Aircraft System.

    The study provide a base for future deformation studies at the Hälsingland farm Slåttagården. The collected data have low position uncertainty (about 0.01 m) and are therefore considered to be a good base for continued deformation studies.

  • 42.
    Edlund, Isabelle
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Jonsson, Amanda
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Kommunal markpolicy: Ett medel i kommunens hantering av markärenden2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Hur marken ska användas och av vem är aktuella frågor i dagens samhälle till följd av att många tätorter i Sverige är i en expansiv fas. Kommuner är till största del de viktigaste markägarna av exploaterbar mark. Det har påträffats att endast några kommuner har publicerade dokument som visar den vilja och de riktlinjer kommunen har med det kommunala markinnehavet, kommande markförvärv och i markärenden med privata aktörer utanför den kommunala verksamheten. Till följd av det är syftet med studien att uppmärksamma och öka kunskapen om kommunal markpolicy. 

    En markpolicy är ett styrdokument som beskriver en kommuns vilja och riktlinjer för det kommunala markinnehavet. Policyn ska utgöra ett beslutsunderlag och vara vägledande för kommunens hantering av markärenden. Syftet med studien är även att bidra till en effektivare markpolitik och mer enhetlig handläggning av markärenden samt en mer transparent kontakt mellan kommun och privata aktörer. Målet med studien är att ge svar på om en dokumenterad markpolicy kan vara ett bra underlag i kommunala markärenden, samt vad en markpolicy bör innehålla för att den ska uppfylla sitt syfte.

    I studien har två metoder använts, en granskning av befintliga markpolicyer och intervjuer. Granskningen av markpolicyer genomfördes med syftet att studera policyns syfte och innehåll. Intervjuer genomfördes med både kommuner som har en dokumenterad markpolicy och med kommuner som inte har en sådan samt intervjuer med bygg- och fastighetsutvecklingsföretag. 

    Resultatet av granskningen visade att visst innehåll är mer vanligt förekommande i kommunernas markpolicyer. Intervjuerna visade att det finns delade meningar om en markpolicys betydelse, vad den bör innehålla samt om privata aktörer är hjälpta av en sådan. Främst används markpolicyn internt av kommunen och är ett verktyg för att förankra markpolitiken, detta skapar en samlad bild utåt mot privata aktörer. 

    De slutsatser som kan tas av studien är att en markpolicy kan vara till hjälp för kommuner, dels för att förankra markpolitiken och för att skapa en mer enhetlig handläggning av markärenden inom kommunen. En markpolicy kan även leda till ökad transparens mellan kommuner och privata aktörer. 

  • 43.
    Eggers, Patrick
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Parallelization of ray casting for solar irradiance calculations in urban environments2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The growing amount of photovoltaic systems in urban environments creates peaks of energy generation in local energy grids. These peaks can lead to unwanted instability in the electrical grid. By aligning solar panels differently, spikes could be avoided. Planning locations for solar panels in urban environments is very time-intense as they require a high spatial and temporal resolution. The aim of this thesis is to investigate the decrease in runtime of planning applications by parallelizing ray-casting algorithms. This thesis includes a software tool for professionals and laymen, which has been developed in a user centered design process and shows ways to perform those calculations on a graphics processing unit.After creating a computational concept and a concept of the software design, those concepts have been implemented starting with an implementation of the Möller-Trumbore ray-casting algorithm which has been run with Python on the central processing unit (CPU). Further the same test with the same algorithm and the same data has been performed on the graphics processing unit (GPU) by using PyCUDA, a Python wrapper for NVIDIAs Compute Unified Device Architecture (CUDA). Both results were compared resulting in, that parallelizing, transferring and performing those calculations on the graphics processing unit can decrease the runtime of a software significantly. In the used system setup, the same calculations were 42 times faster on the Graphics Processing Unit than on the Central Processing Unit. It was also found, that other factors such as the time of the year, the location of the tested points in the data model, the test interval length and the algorithm design of the ray-casting algorithm have a major impact on the performance of such. In the test scenario the processing time for the same case, but just during another time of the year, increases by factor 4.The findings of this thesis can be used in a wide range of software as it shows, that computationally intensive calculations can easily be sourced out from the Python code and executed on another platform. By doing so, the runtime can be significantly decreased and the whole software package can get an enormous speed boost.

  • 44.
    Ekelund, Hugo
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Gustavar, Joakim
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Lutning och Buktningskontroll av horisontell yta med geodetiska mätinstrument2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Performing controls of different types of objects in the construction phase of buildings are of great importance to avoid unnecessary costs and delays. Concrete floors are one type of object that has defined tolerances regarding levelness and flatness. In Sweden, the tolerance for levelness and flatness can be found in the national guideline AMA-Hus. Flatness is controlled within two different diameters of 0.25 m and 2 m respectively, in this study referred to as local and global flatness.The aim of this study was to identify the optimal method to control levelness and flatness of a horizontal surface and to determine the effect from the angle of incidence using reflectorless measurements. Grid scanning with different point density performed with a multi station and laser scans from multi station and laser scanner were used to collect the data. Before measurements artificial elevated curvatures where placed on the concrete floor. Data from the measurements where interpolated in Surfer software, and height maps were created. The interpolation method used was Kriging. Software containing an algorithm for objective flatness detection was developed in cooperation with a civil engineer in computer science.Analysis of the grid scanning data revealed that point density over 12.5 cm is not sufficient to detect significant elevation differences when controlling flatness. Grid scanning at 12.5 cm or thicker also cannot be deemed optimal since the time required to perform the measurements are disproportionately long. Laser scanning using the multi station proved, in the conditions of this study, to be the optimal method for levelness and flatness control in respect to time consumption.Steeper angle of incidence from measurements further from the instrument showed no systematical deviations of the measurements in this study. However, the increased point density found close to the instrument caused something that could be considered as noise in the point cloud as well as increased time consumption.

  • 45.
    Eklund, Per
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Olofsson, Elias
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Galileos påverkan på snabb statisk mätning vid korta baslinjer2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Global Navigation Satellite System (GNSS) is a global system for satellite positioning and navigation and consists, amongst other, of Global Positioning System (GPS) and Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS). Currently, these systems are the only fully global operative satellite systems for positioning. Galileo is an upcoming satellite system and offers at the present time 14 active satellites, but will consist of 30 satellites once it is fully operational by 2020.

    The survey method with GNSS that has lowest uncertainties is static survey. It is a relative method which means that a minimum of two receivers observe simultaneously, usually for several hours. Rapid static surveying is a further development of static surveying and offers much shorter observation times, but it imposes a restriction of the baseline length.

    The purpose of this study is to evaluate Galileo’s contribution on rapid static surveying and see whether Galileo can decrease uncertainties, deviations and observation times in different constellations with GPS and GLONASS.

    Measurements were conducted during two days for two and four hours respectively. Two baselines were measured; the first baseline had a length of 0.4 km and the second nearly 2 km. Later in a software, each constellation was divided in ten time windows (epochs) and each time window was then divided in three sessions (1, 5 and 10 minutes). Four types of constellations were tried: GPS, GPS and GLONASS, GPS and Galileo and lastly all three combined.

    Results show that low uncertainties are obtained when more than one constellation is used. Lowest uncertainties can be obtained with all constellations active. Surveying with only GPS gives the highest uncertainties in all cases, but this is especially true for the shortest session (1 minute). Similarities in uncertainties between the short and long baseline is clear, but uncertainties are higher for the long baseline. Deviations are lower with all constellations active, but the baseline length is in almost all cases too short.

    The conclusion from the study is that Galileo can be used to lower observation time and uncertainties. However this is negligible when used with GPS and GLONASS, at least for the two baselines in this test. Low uncertainties can be achieved with multi constellation or longer observation time.

  • 46.
    El-Mekawy, Mohamed
    et al.
    Department of Computer and Systems Sciences, Stockholm University, Sweden .
    Östman, Anders
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    A unified building model for a real 3D cadastral system2015In: Emerging issues, challenges and opportunities in urban e-planning / [ed] Carlos Nunes Silva, Hershey, PA: IGI Global, 2015, p. 252-279Chapter in book (Other academic)
    Abstract [en]

    Cadastral systems today are mostly based on digitally represented 2D parcel maps or land registries of 3D components referenced to different documents. With clear limitations to this method, this chapter focuses on creating 3D property information based on existing 3D building models. It starts by investigating shortages of the most prominent semantic building models for BIM and geospatial models (IFC and CityGML, respectively) as well as a pre-developed Unified Building Model (UBM). The result shows that neither one of the three has capabilities for complete 3D cadastre systems. The chapter proposes an extension to the UBM by adding four subtypes to the boundary surfaces above- and under-ground, namely “Building Elements,” “Digging,” “Protecting Area,” and “Real Estate Boundary.” The extended UBM is then implemented in a case study of a hospital building in Sweden and shown to be able to model all surfaces that define 3D cadastral information of buildings. The extended UBM is argued to contribute to e-planning in cities and urban applications as well as to 3D cadastral applications.

  • 47.
    Engblom, Mikael
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Planläggning av cirkulationsplatser ur ett säkerhetsperspektiv: En fallstudie av cirkulationsplatser i Gävle2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Planning of roundabouts have become a common feature in various cities around the world to resolve dangerous situations that may occur in traditional four-way intersections. This is because the motorists’ speed is lower in a roundabout compared to a standard four-way intersection, which leads to less severe accidents. Are vulnerable road users safety benefits at a roundabout as clear?

    The purpose of the study is to examine the design of traffic environments, with a focus on pedestrian and cyclists’ safety in connection to roundabouts. I have seen on the safety aspects that should be taken into consideration for pedestrians and cyclists.

    The research questions in my study are:

    - What are the advantages and disadvantages of vulnerable road users with planning and construction of roundabouts?

    - Which safety aspects are taken into consideration in roundabouts?

    The research is based on a qualitative approach. Data collection methods used are observation, interview and qualitative text analysis. The study included three planners from Gävle, Eskilstuna and Västerås. The highlighted safety aspects, advantages and disadvantages presented by the surveyed municipalities proceed from with planning of roundabouts and pedestrian crossings.

    In the result it can be stated that with fast and relatively simple methods and steps are possible to improve pedestrian and cyclist safety on crossings at roundabouts.

  • 48.
    Englin, Jenny
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Strandskyddets tillämpning i Hälsingland: En granskning av strandskyddslagstiftningen, utifrån Lantmäteriets och länsstyrelsens bedömning2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The coasts and shoreline of the world have an important role in society, both for the economy, green areas for recreation and natural aspects. Important aspects that can also adversely affect the world's shoreline. In Sweden, the shoreline is protected by shore protection laws, which aims to protect public and private interests and ensure good conditions for animal and plant life. Shore protection laws is a form of conservation regulations that must always be taken into account when registration of property. The shore protection is generally, which means that all shore and waters in Sweden are affected. The shore protection starts from the shoreline and 100 meters up to land and 100 meters into the water. When registration of property, the surveyors apply the applicable legislation and consult with the relevant authorities in order not to counteract the purpose of shore protection.

    The purpose of the thesis is to analyze the application of the shore protection laws in registration of property, on the decision of the country administrative board and the Swedish Mapping, Cadastral and Land Registration Authority, Lantmäteriet.

    The goal is to find the difference between how the county administrative board and the Lantmäteriet applies the shore protection in registration of property.

    The method of the study is based on a qualitative analysis, a legal analysis and a literature study. The purpose of the study was to review the shore protection laws regulations from Lantmäteriet and the county administrative board's claims to the appeals, which was carried out by the legal analysis and parts of the literature study. The qualitative study consisted of a questionnaire sent to all participating county administrative boards in Sweden and interviews with surveyors. The study would have been carried out throughout Sweden but implemented only in Hälsingland.

    The result of the study showed that there are differences in the application of the shore protection laws regulations in Hälsingland. The difference may be due to the fact that the shore protection of the is difficult to interpret, which allows for different applications for different registration of property.

  • 49.
    Ennerfors, Senny
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Värdering och prissättning av fastigheter som är upplåtna med tomträtt för småhus: – En studie kring friköp2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Site-leasehold is a right to access and use a property for an indefinite period. It is possible to lease a property belonging to the state and the municipality. It is also possible to lease a site-leasehold in a property belonging to a foundation if the government gives its consent.Most municipalities let their site-leaseholders purchase their leaseholds at a discounted price, which is usually based on a certain percentage of the property tax value. There are a number of challenges with valuing a site-leasehold such as the lack of a free and open market because there is only one buyer, i.e. the leaseholder. There is also often a lack of location based price material.The purpose of the study is to investigate how site-leaseholds are priced by municipalites real estate valuation companies. The study is about investigating the underlying causes that affect the pricing.The aim of the study is to provide answers to whether a site-leasehold even can be sold to a market value, and in that case how such a valuation model may look like.The study has been conducted using two methods. One method consisted of surveys that were sent to 68 municipalities in Sweden and the purpose was to investigate how municipalities priced their site-leaseholds and what challenges they see with pricing. Then interviews were conducted with three different real estate valuation companies. The purpose of the interviews is to investigate how real estate valuation companies view valuation and pricing of site-leaseholds.The study shows that municipalities feel that site-leaseholds are sold at a low price but that there are some underlying factors explaining this. The interviews also showed that valuation and pricing of site-leaseholds are divided into two issues, i.e. real estate valuation and land policy. Finally, it was found that municipalities can sell leaseholds at a market value, but that there are some important aspects that speak against doing so, for an example the lack of a free and open market.

  • 50.
    Ericsson, Elin
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Lindberg, Albin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Development opportunities in the land management process in Rwanda: In order to achive a more effective and efficient land use2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A well-functioning property system is a criterion for a country to have good opportunities in social development. This study looks into one of the development opportunities in Rwanda’s real estate system, especially the provision and the updating of the country’s management in the land use process. The problems in Rwanda are described as a combination of lack of communication and knowledge from the authorities and the population. The methods in this study conducted of a qualitative interview combined with a literature review. This in order to gain the fact needed to answer the research questions of this study were the aim was to find some difference between the Master Plan and the physical reality and suggestions in how to establish effective and efficient land use in Rwanda. At first the study aimed to perform a comparative analysis but while performing the methods it was showed that the comparison method was impossible to go through with, instead the study got depended on a literature review along with interviews to be able to answer the research questions of the study. The results from the methods are presented in two steps, first the results from the interviews and then is the results from the literature review presented. The different interviews gave similar results in four main categories which made the conclusion obvious. The land use planning law needs to be reviewed and that the Ministry of Lands and Forestry have a lack of concrete tolls and power to prevent illegal land use.

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