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| Titel |
Validation of CryoSat-2 derived lake and fjord levels in Denmark |
| VerfasserIn |
Karina Nielsen, Lars Stenseng, Heidi Villadsen, Ole B. Andersen, Per Knudsen |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098236
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| Publikation (Nr.) |
 EGU/EGU2014-13894.pdf |
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| Zusammenfassung |
| The ESA satellite Cryosat-2, launched in 2010, is the first mission that carries a radar
altimeter, which is able to operate in Synthetic aperture radar (SAR) mode. Compared to
conventional altimetry, the SAR mode provides a much higher resolution in the along-track
direction, which for Cryosat-2 is approximately 300 m. This higher resolution opens new
possibilities with respect to monitoring and modeling of inland water bodies, since much
smaller bodies can be observed than previously.
Retracking of the SAR waveform is essential to obtain accurate water levels used in
hydrological modeling. It is therefor important to evaluate and validate the accuracy of the
retrackers. In this study, which is part of the FP7 project Land and Ocean take up from
Sentinel-3 (LOTUS), we process the ESA SAR L1b Baseline B data product, using various
retrackers, to derive water levels in Danish lakes and fjords. Denmark is an excellent test area,
since there are a large amount of lakes and fjord systems ranging from a few km2 to 100 km2,
which enable us to test our retrakers on different water conditions. Based on a statistical
analysis we evaluate the performance and stability of the different retrackers. To
validate our results, we compare the retracked water levels with the SRTM digital
elevation model (DEM) and a high resolution Danish DEM, with a grid size of 1.6
m. |
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