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Wave spectra retrieval from complex ENVISAT Wave Mode data using a parametric inversion scheme

Schulz-Stellenfleth, Johannes and Lehner, Susanne and Hoja, Danielle (2005) Wave spectra retrieval from complex ENVISAT Wave Mode data using a parametric inversion scheme. In: Proceedings of the Committee on Earth Observation Satellites Working Group on Calibration and Validation Synthetic Aperture Radar Workshop 2004, pp. 1-6. CEOS SAR workshop 2004, Ulm, Germany, 25-27 May 2004.

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Abstract

Spaceborne synthetic aperture radar (SAR) is still the only instrument providing directional ocean wave information on a global and continuous basis. Different retrieval schemes for the derivation of two-dimensional ocean wave spectra Fk from SAR data have been developed (Krogstad, 1994; Hasselmann et al., 1996; Mastenbroek, 2000; Dowd, 2001; Johnson et al., 2003). The potential of the data for improving wave model forecasts has been demonstrated [Heimbach et. al, 2000]. More recent schemes are based on SAR cross spectra, which allow to resolve the directional wave propagation ambiguity present in conventional SAR image variance spectra (Engen, 1995). With the launch of the European satellite ENVISAT cross spectra have become available on anoperational basis. Actvities therefore exist at different weather centres to use the data for the assimilation of numerical ocean wave forecast models. The cross spectra method is based on a special processing technique, where two SAR images (looks), which are separated by about half a second (Engen, 1995) are generated. By calculating the cross spectrum Ök of the two looks information can be obtained about the wave propagation direction. This information had to be taken from wave models in earlier retrieval schemes which were based on symmetric SAR image variance spectra.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2005, monograph_id=21 (on CD ROM),
Title:Wave spectra retrieval from complex ENVISAT Wave Mode data using a parametric inversion scheme
Authors:
AuthorsInstitution or Email of Authors
Schulz-Stellenfleth, JohannesUNSPECIFIED
Lehner, SusanneUNSPECIFIED
Hoja, DanielleUNSPECIFIED
Date:2005
Journal or Publication Title:Proceedings of the Committee on Earth Observation Satellites Working Group on Calibration and Validation Synthetic Aperture Radar Workshop 2004
Page Range:pp. 1-6
Editors:
EditorsEmail
ESA, UNSPECIFIED
Status:Published
Event Title:CEOS SAR workshop 2004, Ulm, Germany, 25-27 May 2004
Organizer:ESA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Bärbel Bolowski
Deposited On:06 Feb 2006
Last Modified:06 Jan 2010 22:41

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