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| Titel |
River and Lake Level Observation from Radar Altimetry |
| VerfasserIn |
Philippa Berry, Richard Smith, Mark Salloway, Bruno Manuel Lucas, Salvatore Dinardo, Jérôme Benveniste |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250082191
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| Zusammenfassung |
| Satellite altimetry has been used for many years to measure the height of inland water bodies; this paper assesses the contribution of the EnviSat RA-2 to global inland water monitoring. A full waveform analysis of cycles 10 to 85 of the EnviSat RA-2 SGDR dataset has been completed over inland water, retrieving over 822,000 crossings. The results confirm that the unique dynamic mode-switching capability of the RA-2 has enabled the instrument to maintain lock over rapidly varying terrain, thus acquiring a huge database of echoes over inland water. The vast majority of these targets were acquired in 320MHz ‘ocean’ mode, enabling precise retracking and allowing generation of 25636 time-series of inland water heights. Analysis reveals that of these, 15067 have successfully retrieved the target signature.
A mature pilot demo has been running since 2005, generating river and lake height time series disseminated to the end users within 3 days of satellite overpass; this paper includes an analysis of the user base. The data currently available in the River & Lake system are derived from conventional EnviSat and Jason-2 altimeter waveforms. The new generation of SAR type altimeters (on CryoSat and Sentinel-3) will require new processing techniques to produce accurate heights. To this end an analysis is made of 1800Hz EnviSat individual echoes, to determine what results can be obtained with a much higher pulse repetition frequency. This analysis reveals that even small pools of water can be identified, and height time-series successfully retrieved from as few as 7 IEs. |
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