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Spaceborne GNSS-R Observation of Global Lake Level: First Results from the TechDemoSat-1 Mission

by Liwen Xu 1,2, Wei Wan 1,*, Xiuwan Chen 1,2, Siyu Zhu 3, Baojian Liu 1 and Yang Hong 1
1
Institute of Remote Sensing and GIS, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2
Engineering Research Center of Earth Observation and Navigation (CEON), Ministry of Education, Beijing 100871, China
3
Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(12), 1438; https://doi.org/10.3390/rs11121438
Received: 24 May 2019 / Revised: 9 June 2019 / Accepted: 15 June 2019 / Published: 18 June 2019
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 km2 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. View Full-Text
Keywords: TechDemoSat-1; GNSS-R; water level; lake TechDemoSat-1; GNSS-R; water level; lake
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Xu, L.; Wan, W.; Chen, X.; Zhu, S.; Liu, B.; Hong, Y. Spaceborne GNSS-R Observation of Global Lake Level: First Results from the TechDemoSat-1 Mission. Remote Sens. 2019, 11, 1438.

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