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.

引用

页数：10