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| Titel |
Validation of CryoSat-2 derived lake levels |
| VerfasserIn |
Karina Nielsen, Lars Stenseng, Ole Andersen, Heidi Villadsen, Per Knudsen |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109275
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| Publikation (Nr.) |
 EGU/EGU2015-9168.pdf |
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| Zusammenfassung |
| The SIRAL altimeter on-board the ESA satellite CryoSat-2 is the first radar altimeter that is
capable of operating in synthetic aperture radar (SAR) mode. The SAR technology provides a
much higher along-track resolution compared to conventional altimetry. The higher
resolution makes it possible to accurately monitor much smaller water bodies than
previously.
In this study, which is part of the FP7 project Land and Ocean take up from Sentinel-3
(LOTUS), we examine and validate Cryosat-2 derived lake levels and as a reference we
compare our results with lake levels based on Envisat data. As a test case we consider 5 lakes;
Vänern (Sweden), Okeechobee (Florida, US), Arresø, Mossø, and Skanderborgsø (Denmark),
which are ranging from approximately 9 km2 to 5655 km2. We estimate the along-track
precision and the accuracy by validating the estimated lake levels with gauge data from
Okeechobee and Vänern. We find that the precision based on CryoSat-2 increase significantly
for small lakes compared to Envisat. Despite the spatially varying lake crossings, Cryosat-2 is
able to provide lake level time series of a quality that is comparable to or better than Envisat.
Hence, these results demonstrate the promising possibilities of the upcoming mission
Sentinel-3, which potentially will be able to provide accurate time series for small
lakes. |
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