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Activity Report: Contributions from Lantmäteriet to the InSAR-Sweden Project
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Computer and Geospatial Sciences, Geospatial Sciences. Lantmäteriet, Gävle.ORCID iD: 0000-0003-1744-7004
Lantmäteriet, Gävle.
Lantmäteriet, Gävle.
Lantmäteriet, Gävle.
2023 (English)Report (Other academic)
Abstract [en]

The two-year Swedish Ground Motion Service (InSAR-Sweden) project was started in 2021 and made a collaboration between the Geological Survey of Norway (NGU) and several Swedish organizations, including Lantmäteriet. During the project, the InSAR-based ground motion service has been developed by NGU using Sentinel-1 data (2015–2021) and the Persistent Scatterer Interferometry (PSI) technique and is freely available for interested users. There were different working groups in the project and Lantmäteriet has contributed mostly to working group WP#3 which is the “validation of deformation data”.We used the PSI results of previous studies for Uppsala and Gävle cities to validate the newly launched InSAR-Sweden ground motion service. We compared the deformation localization and Line of Sight (LOS) displacement time series at some deforming locations. Although the number and acquisition dates of Sentinel-1 data and the parameters used for PSI processing differ between Uppsala, Gävle and InSAR-Sweden, the cross-checked results demonstrate good agreement between corresponding studies regarding the localization and rate of subsidence in those two cities over a period of five years.During the project, Lantmäteriet installed several types of radar corner reflectors (CR) in different locations in Sweden. These corner reflectors are passive devices which provide precise measurement points and can be installed at desired locations. These devices can be used to measure temporal LOS changes and consequently the ground movements precisely using the InSAR technique. The plan is to continue and complement the national geodetic infrastructure with at least 20 passive reflectors which are collocated with permanent GNSS stations and/or tide gauges. Among others, these co-located permanent GNSS stations and corner reflectors can potentially contribute to the development and validation of the national (InSAR-Sweden) and European ground motion (EGMS) services. Moreover, the co-location helps to transform the relative ground motions estimated with InSAR to an absolute geodetic reference frame.In this activity report, we provide a brief introduction to SAR corner reflectors and their applications, and we explain our progress in installing such reflectors in Sweden. We also present our preliminary results from our data analysis. Moreover, we explain our cross-checking of the results obtained from InSAR-Sweden with the InSAR-based studies conducted for Uppsala and Gävle cities.

Place, publisher, year, edition, pages
Gävle: Lantmäteriet , 2023. , p. 40
Series
Lantmäterirapport - Geodetic Report, ISSN 0280-5731 ; 1
Keywords [en]
InSAR, deformation, remote sensing, subsidence, Ground motion, validation, corner reflectors
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:hig:diva-41126OAI: oai:DiVA.org:hig-41126DiVA, id: diva2:1739390
Available from: 2023-02-24 Created: 2023-02-24 Last updated: 2023-03-10Bibliographically approved

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https://www.lantmateriet.se/globalassets/geodata/gps-och-geodetisk-matning/rapporter/lantmaterirapport_2023-1.pdf

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Nilfouroushan, Faramarz

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CiteExportLink to record
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