Journal article
Influence of local geoid variation on water surface elevation estimates derived from multi-mission altimetry for Lake Namco
Department of Environmental Engineering, Technical University of Denmark1
Air, Land & Water Resources, Department of Environmental Engineering, Technical University of Denmark2
National Space Institute, Technical University of Denmark3
Geodesy, National Space Institute, Technical University of Denmark4
Chinese Academy of Sciences5
Water surface elevation (WSE) is an essential quantity for water resource monitoring and hydrodynamic modeling. Satellite altimetry has provided data for inland water bodies. The height that is derived from altimetry measurement is ellipsoidal height. In order to convert the ellipsoidal height to orthometric height, which has physical meaning, accurate estimates of the geoid are needed.
This paper evaluates the suitability of geodetic altimetric measurements for improvement of global geoid models over a large lake in the Tibetan Plateau. CryoSat-2 and SARAL/AltiKa are used to derive the high-frequency geoid correction. A validation of the local geoid correction is performed with data from in-situ observations, a laser altimetry satellite (ICESat), a Ka-band radar altimetry satellite (SARAL) and a SAR radar altimetry satellite (Sentinel-3).
Results indicate that the geodetic altimetric dataset can capture the high-resolution geoid information. By applying local geoid correction, the precision of ICESat, SARAL and Sentinel-3 retrievals are significantly improved. We conclude that using geodetic altimetry to correct for local geoid residual over large lakes significantly decreases the uncertainty of WSE estimates.
These results also indicate the potential of geodetic altimetry missions to determine local geoid residual with centimeter-level accuracy, which can be used to improve global and regional geopotential models.
Language: | English |
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Year: | 2019 |
Pages: | 65-79 |
ISSN: | 00344257 and 18790704 |
Types: | Journal article |
DOI: | 10.1016/j.rse.2018.11.004 |
ORCIDs: | Jiang, Liguang , 0000-0003-2090-2813 , Andersen, Ole Baltazar , Nielsen, Karina and Bauer-Gottwein, Peter |