1. Spaceborne GNSS-R Observation of Global Lake Level: First Results from the TechDemoSat-1 Mission.
- Author
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Xu, Liwen, Wan, Wei, Chen, Xiuwan, Zhu, Siyu, Liu, Baojian, and Hong, Yang
- Subjects
GLOBAL Positioning System ,BODIES of water ,ORBIT determination ,LAKES ,TITAN (Satellite) - Abstract
Spaceborne global navigation satellite system reflectometry (GNSS-R) data collected by the UK TechDemoSat-1 (TDS-1) satellite is applied to retrieve global lake levels for the first time. Lake levels of 351 global lakes (area greater than 500 km
2 and elevation lower than 3000 m each) are estimated using TDS-1 Level 1b data over 2015–2017. Strong correlations (overall R2 greater than 0.95) are observed among lake levels derived from TDS-1 and other altimetry satellites such as CryoSat-2, Jason, and Envisat (the latter two are collected by Hydroweb), although with large root-mean-square error (RMSE) (tens of meters) mainly due to the fact that TDS-1 is not dedicated for altimetry measuring purpose. Examples of the Caspian Sea and the Poyang Lake show consistent spatial and temporal variations between TDS-1 and other data sources. The results in this paper provide supportive information for further application of GNSS-R constellations to measure altimetry of inland water bodies. [ABSTRACT FROM AUTHOR]- Published
- 2019
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