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Water 2017, 9(6), 374; doi:10.3390/w9060374

The Performance and Potentials of the CryoSat-2 SAR and SARIn Modes for Lake Level Estimation

Department of Geodesy, DTU Space, National Space Institute, 2800 Kgs. Lyngby, Denmark
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Academic Editors: Frédéric Frappart and Luc Bourrel
Received: 28 February 2017 / Revised: 5 May 2017 / Accepted: 19 May 2017 / Published: 25 May 2017
(This article belongs to the Special Issue The Use of Remote Sensing in Hydrology)
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Abstract

Over the last few decades, satellite altimetry has proven to be valuable for monitoring lake levels. With the new generation of altimetry missions, CryoSat-2 and Sentinel-3, which operate in Synthetic Aperture Radar (SAR) and SAR Interferometric (SARIn) modes, the footprint size is reduced to approximately 300 m in the along-track direction. Here, the performance of these new modes is investigated in terms of uncertainty of the estimated water level from CryoSat-2 data and the agreement with in situ data. The data quality is compared to conventional low resolution mode (LRM) altimetry products from Envisat, and the performance as a function of the lake area is tested. Based on a sample of 145 lakes with areas ranging from a few to several thousand km 2 , the CryoSat-2 results show an overall superior performance. For lakes with an area below 100 km 2 , the uncertainty of the lake levels is only half of that of the Envisat results. Generally, the CryoSat-2 lake levels also show a better agreement with the in situ data. The lower uncertainty of the CryoSat-2 results entails a more detailed description of water level variations. View Full-Text
Keywords: satellite altimetry; CryoSat-2; water level; lakes satellite altimetry; CryoSat-2; water level; lakes
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MDPI and ACS Style

Nielsen, K.; Stenseng, L.; Andersen, O.B.; Knudsen, P. The Performance and Potentials of the CryoSat-2 SAR and SARIn Modes for Lake Level Estimation. Water 2017, 9, 374.

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