气候变化领域集成服务门户(CCPortal): The performance of CryoSat-2 fully-focussed SAR for inland water-level estimation

CCPortal

DOI	10.1016/j.rse.2019.111589
	The performance of CryoSat-2 fully-focussed SAR for inland water-level estimation
	Kleinherenbrink M.; Naeije M.; Slobbe C.; Egido A.; Smith W.
发表日期	2020
ISSN	00344257
卷号	237
英文摘要	This paper applies the Fully-Focussed SAR (FF-SAR) algorithm to CryoSat-2 full-bit-rate data to measure water levels of lakes and canals in the Netherlands, and validates these measurements by comparing them to heights measured by gauges. Over Lake IJssel, a medium-sized lake, the FF-SAR height is biased about 6 cm below the gauge height, and a similar bias is found at six sites where CryoSat-2 crosses rivers and canals. The precision of the FF-SAR measurements depends on the extent of multi-looking (incoherent averaging along-track) applied. Over Lake IJssel the precision varies from 4 to 11 cm, decreasing as multi-looking increases. The precision of FF-SAR with 100 m of multi-looking is equivalent to that of the standard delay/Doppler processing, which has an along-track resolution of about 300 m. The width and orientation of rivers and canals limits the maximum available multi-looking. After removing the 6 cm bias, FF-SAR heights of rivers and canals have an accuracy between 2 cm and several decimeters, primarily depending on the presence of other water bodies lying within the cross-track measurement footprint, as these contaminate the waveform. We demonstrate that FF-SAR processing is able to resolve and measure small ditches only a few meters in width. The visibility of these signals depends on the angle at which CryoSat-2 crosses the ditch and on whether or not the ditch remains straight within CryoSat-2’s field of view. In the best-case scenario, straight ditches at nearly 90° to the CryoSat-2 ground track, the ditch signal has high enough signal-to-noise to allow sub-decimeter accuracy of FF-SAR height measurement. © 2019 Elsevier Inc.
英文关键词	Altimetry; CryoSat-2; FF-SAR; Inland water; Validation
语种	英语
scopus关键词	Canals; Gages; Hydraulic structures; Rivers; Signal to noise ratio; Water levels; Altimetry; Cryosat; FF-SAR; Inland waters; Validation; Lakes; algorithm; CryoSat; gauge; inland sea; model validation; precision; satellite altimetry; synthetic aperture radar; visibility; water level; Netherlands
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179520
作者单位	Astrodynamics and Space Missions, Delft University of Technology, Netherlands; Geoscience and Remote Sensing, Delft University of Technology, Netherlands; NOAA Laboratory for Satellite Altimetry, United States; Global Science & Technology, Inc., United States
推荐引用方式 GB/T 7714	Kleinherenbrink M.,Naeije M.,Slobbe C.,et al. The performance of CryoSat-2 fully-focussed SAR for inland water-level estimation[J],2020,237.
APA	Kleinherenbrink M.,Naeije M.,Slobbe C.,Egido A.,&Smith W..(2020).The performance of CryoSat-2 fully-focussed SAR for inland water-level estimation.Remote Sensing of Environment,237.
MLA	Kleinherenbrink M.,et al."The performance of CryoSat-2 fully-focussed SAR for inland water-level estimation".Remote Sensing of Environment 237(2020).