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Regional geoid computation by least squares modified Hotine’s formula with additive corrections
Tallinn University of Technology, Estonia.
Tallinn University of Technology, Estonia.
Lantmäteriet.
KTH.
2018 (Engelska)Ingår i: Journal of Geodesy, ISSN 0949-7714, E-ISSN 1432-1394, Vol. 92, nr 3, s. 253-270Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Geoid and quasigeoid modelling from gravity anomalies by the method of least squares modification of Stokes’s formula with additive corrections is adapted for the usage with gravity disturbances and Hotine’s formula. The biased, unbiased and optimum versions of least squares modification are considered. Equations are presented for the four additive corrections that account for the combined (direct plus indirect) effect of downward continuation (DWC), topographic, atmospheric and ellipsoidal corrections in geoid or quasigeoid modelling. The geoid or quasigeoid modelling scheme by the least squares modified Hotine formula is numerically verified, analysed and compared to the Stokes counterpart in a heterogeneous study area. The resulting geoid models and the additive corrections computed both for use with Stokes’s or Hotine’s formula differ most in high topography areas. Over the study area (reaching almost 2 km in altitude), the approximate geoid models (before the additive corrections) differ by 7 mm on average with a 3 mm standard deviation (SD) and a maximum of 1.3 cm. The additive corrections, out of which only the DWC correction has a numerically significant difference, improve the agreement between respective geoid or quasigeoid models to an average difference of 5 mm with a 1 mm SD and a maximum of 8 mm.

Ort, förlag, år, upplaga, sidor
2018. Vol. 92, nr 3, s. 253-270
Nyckelord [en]
Geoid, Gravity anomaly, Gravity disturbance, Hotine, Quasigeoid, Stokes
Nationell ämneskategori
Annan geovetenskap och miljövetenskap Geofysik
Identifikatorer
URN: urn:nbn:se:hig:diva-31121DOI: 10.1007/s00190-017-1061-7OAI: oai:DiVA.org:hig-31121DiVA, id: diva2:1373564
Tillgänglig från: 2019-11-27 Skapad: 2019-11-27 Senast uppdaterad: 2019-11-27Bibliografiskt granskad

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Ågren, Jonas
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Journal of Geodesy
Annan geovetenskap och miljövetenskapGeofysik

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