Improved Determination of Sea Surface Heights Close to the Australian Coast from ERS-2 Satellite Radar Altimetry
MetadataShow full item record
The homogeneous and repeated data coverage over coastal regions from satellite radar altimetry is one important data source for oceanographic and geodetic applications. However, the sea surface heights (SSH) extracted from the altimeter data are often in error close to the coast, due in part to the complex nature of echoes returned from rapidly varying coastal topographic surfaces (both land and sea) and the generally rougher sea state. This paper presents improved SSH results derived from ERS-2 altimeter waveform data (two cycles of 35-day repeat orbit, March to May 1999) near the Australian coast using a coastal retracking system. This system was developed based upon a systematic and comprehensive analysis of return waveforms. Central to the system is the use of two retracking techniques: the iterative least squares fitting and the threshold retracking algorithms. Using the AUSGeoid98 geoid grid as a quasi independent ground reference and comparing with abroad contaminated distance of ~10 km obtained from a previous study before retracking, the use of the retracking system is able to reduce this contaminated distance to ~5 km. However, improved SSH data cannot be recovered by waveform retracking less than ~5 km from the coastline due to predominant land returns in the waveform range window.
The original publication is available at : http://www.springerlink.com
Showing items related by title, author, creator and subject.
A Coastal Retracking System for Satellite Radar Altimeter Waveforms: Application to ERS-2 Around AustraliaDeng, X.; Featherstone, Will (2006)Satellite radar altimeter-derived sea surface heights (SSH) are in error in coastal regions due, in part, to the complex nature of echoes returned from rapidly varying land and sea surfaces. This paper presents improved ...
Estimation of contamination of ERS-2 and POSEIDON satellite radar altimetry close to the coasts of AustraliaDeng, Xiaoli; Featherstone, Will; Hwang, C.; Berry, P. (2002)It is broadly acknowledged that the precision of satellite-altimeter-measured instantaneoussea surface heights (SSH) is lower in coastal regions than in open oceans, duepartly to contamination of the radar return from the ...
Improved gravity anomaly fields from retracked multimission satellite radar altimetry observations over the Persian Gulf and the Caspian SeaKhaki, M.; Forootan, E.; Sharifi, M.; Awange, Joseph; Kuhn, M. (2015)Satellite radar altimetry observations are used to derive short wavelength gravity anomaly fields over the Persian Gulf and the Caspian Sea, where in situ and ship-borne gravity measurements have limited spatial coverage. ...