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Geoid model validation and topographic bias
University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.ORCID iD: 0000-0001-7810-8829
2022 (English)In: Journal of Geodetic Science, ISSN 2081-9919, E-ISSN 2081-9943, Vol. 12, no 1, p. 38-41Article in journal (Refereed) Published
Abstract [en]

Recently a number of geoid campaigns were performed to verify different types of geoid and quasigeoid modeling techniques. Typically, GNSS-leveling was employed as an independent method, but in some cases zenith camera astronomic deflection data were also used in astrogeodetic determinations of the geoid and/or quasigeoid. However, due to the uncertainty in the topographic density distribution data (and thereby in orthometric heights), we conclude that neither GNSS-leveling nor astrogeodetic techniques can reliably verify differences between gravimetric geoid models at several centimeter levels in rough mountainous regions. This is because much the same topographic data are used both in the gravimetric geoid models and in their verifications by geometric and/or astrogeodetic geoid models. On the contrary, this is not a problem in verifying gravimetric quasigeoid models, as they are independent of the topographic density distribution, and so is the related normal height used in GNSS-leveling.

Place, publisher, year, edition, pages
De Gruyter Open, 2022. Vol. 12, no 1, p. 38-41
Keywords [en]
accuracy; density; geoid; topography; quasigeoid; uncertainty; verification
National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:hv:diva-19204DOI: 10.1515/jogs-2022-0133ISI: 000851628300001Scopus ID: 2-s2.0-85138234875OAI: oai:DiVA.org:hv-19204DiVA, id: diva2:1698972
Funder
Swedish National Space Board, 187/18
Note

This study was supported by Project No. 187/18 of the Swedish National Space Agency (SNSA).

Available from: 2022-09-26 Created: 2022-09-26 Last updated: 2024-04-12

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Sjöberg, Lars

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