Journal article
On the Performance of Sentinel‐3 Altimetry Over New Reservoirs: Approaches to Determine Onboard A Priori Elevation
Department of Environmental Engineering, Technical University of Denmark1
Air, Land & Water Resources, Department of Environmental Engineering, Technical University of Denmark2
Chinese Academy of Sciences3
National Space Institute, Technical University of Denmark4
Geodesy and Earth Observation, National Space Institute, Technical University of Denmark5
Satellite radar altimetry has become an important data source supplementing in situ water level. For practical reasons, a radar altimeter can only record reflected echoes within its range window. Therefore, water surface elevation must fall within the range window. To this end, the Sentinel‐3 radar altimetry mission is configured with a new tracking function (i.e., open loop) to position its range window based on an onboard a priori elevation of ground targets.
We found that Sentinel‐3 is unable to observe recently built reservoirs due to the incorrect onboard elevations. To overcome this issue, four approaches are proposed to improve the a priori elevation for inland water bodies, particularly reservoirs. These approaches can significantly increase data availability of Sentinel‐3 over reservoirs and can be used to prepare the onboard elevations of reservoirs and lakes for future missions such as Sentinel‐6, Sentinel‐3C/‐3D, and the Surface Water and Ocean Topography (SWOT) mission.
Language: | English |
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Year: | 2020 |
ISSN: | 19448007 and 00948276 |
Types: | Journal article |
DOI: | 10.1029/2020GL088770 |
ORCIDs: | 0000-0001-6119-9322 , Jiang, Liguang , Kittel, Cecile M. M. , 0000-0003-4556-6641 , 0000-0001-7155-3356 , Andersen, Ole B. , Bauer‐Gottwein, Peter , Nielsen, Karina and Liu, Jun |