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

被引：10
|
作者：
Xu, Liwen [1 ,2 ]
Wan, Wei [1 ]
Chen, Xiuwan [1 ,2 ]
Zhu, Siyu [3 ]
Liu, Baojian [1 ]
Hong, Yang [1 ]
机构：
[1] Peking Univ, Inst Remote Sensing & GIS, Sch Earth & Space Sci, Beijing 100871, Peoples R China
[2] Minist Educ, Engn Res Ctr Earth Observat & Nav CEON, Beijing 100871, Peoples R China
[3] Tsinghua Univ, Dept Hydraul Engn, Beijing 100084, Peoples R China
来源：
REMOTE SENSING | 2019年 / 11卷 / 12期
基金：
中国国家自然科学基金;
关键词：
TechDemoSat-1; GNSS-R; water level; lake; PHASE ALTIMETRY; TIBETAN PLATEAU; OCEAN ALTIMETRY; GPS SIGNALS; WATER-LEVEL; REFLECTOMETRY;
D O I：
10.3390/rs11121438
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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 R-2 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.
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收藏
页数：10
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