Evaluation and Validation of CryoSat-2-Derived Water Levels Using In Situ Lake Data from China

doi:10.3390/rs11080899

	Evaluation and Validation of CryoSat-2-Derived Water Levels Using In Situ Lake Data from China
	Liu, Zhaofei; Yao, Zhijun; Wang, Rui
刊名	REMOTE SENSING
	2019-04-02
卷号	11 期号:8 页码:16
关键词	altimetry water level CryoSat-2 outlier lake in situ gauge
ISSN号	2072-4292
DOI	10.3390/rs11080899
通讯作者	Liu, Zhaofei(zfliu@igsnrr.ac.cn)
英文摘要	CryoSat-2 altimetry has become a valuable tool for monitoring the water level of lakes. In this study, a concentrated probability density function (PDF) method was proposed for preprocessing CryoSat-2 Geophysical Data Record (GDR) data. CryoSat-2 altimetry water levels were preprocessed and evaluated by in situ gauge data from 12 lakes in China. Results showed that the accuracy of the raw GDR data was limited due to outliers in most of the along-track segments. The outliers were generally significantly lower than the in situ values by several meters, and some by more than 30 m. Outlier detection, therefore, improves upon the accuracy of CryoSat-2 measurements. The concentrated PDF method was able to greatly improve the accuracy of CryoSat-2 measurements. The preprocessed CryoSat-2 measurements were able to observe lake levels with a high accuracy at nine of the twelve lakes, with an absolute mean difference of 0.09 m, an absolute standard deviation difference of 0.04 m, a mean root mean square error of 0.27 m, and a mean correlation coefficient of 0.84. Overall, the accuracy of CryoSat-2-derived lake levels was validated in China. In addition, the accuracy of Database for Hydrological Time Series of Inland Waters (DAHITI) and HYDROWEB water level products was also validated by in situ gauge data.
资助项目	National Natural Science Foundation of China[41571027] ; National Natural Science Foundation of China[41561144012] ; National Natural Science Foundation of China[41661144030]
WOS关键词	RADAR ALTIMETER ; TIBETAN PLATEAU ; ENVISAT ; OUTLIERS ; COASTAL ; OCEAN ; MODE
WOS研究方向	Remote Sensing
语种	英语
出版者	MDPI
WOS记录号	WOS:000467646800009
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/59682]
专题	中国科学院地理科学与资源研究所
通讯作者	Liu, Zhaofei
作者单位	Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Liu, Zhaofei,Yao, Zhijun,Wang, Rui. Evaluation and Validation of CryoSat-2-Derived Water Levels Using In Situ Lake Data from China[J]. REMOTE SENSING,2019,11(8):16.
APA	Liu, Zhaofei,Yao, Zhijun,&Wang, Rui.(2019).Evaluation and Validation of CryoSat-2-Derived Water Levels Using In Situ Lake Data from China.REMOTE SENSING,11(8),16.
MLA	Liu, Zhaofei,et al."Evaluation and Validation of CryoSat-2-Derived Water Levels Using In Situ Lake Data from China".REMOTE SENSING 11.8(2019):16.