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Ocean Wave Measurements from Envisat ASAR data Using a Parametric Inversion Scheme

Schulz-Stellenfleth, Johannes and Lehner, Susanne and Hoja, Danielle and Nieto-Borge, Jose Carlos (2004) Ocean Wave Measurements from Envisat ASAR data Using a Parametric Inversion Scheme. In: Proceedings of OMAE2004, 51584-1-51584-4. OMAE 2004, Vancouver, Canada, 20-25 June 2004. ISBN 0-7918-3672-X.

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Abstract

A parametric algorithm is presented to estimate twodimensional ocean wave spectra from ENVISAT ASAR wave mode data on a global scale. The retrieval scheme makes use of prior information taken from numerical wave models. The Partition Rescale and Shift algorithm (PARSA) is based on a partitioning technique, which splits an a priori wave spectrum into its wave system components. Integral parameters of these systems, such as mean direction, mean wavelength, waveheight, and directional spreading are then adjusted iteratively to improve the consistency with the SAR observation. The method takes into account the full nonlinear SAR imaging process and uses a maximum a posteriori approach, which is based on statistical model quantifying the errors of the SAR imaging model, the SAR measurement, and the prior wave spectra. The method is applied to a global data set of ENVISAT ASAR data acquired during the CAL/VAL phase. The benefit of cross spectra compared to conventional symmetric image spectra is demonstrated.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Ocean Wave Measurements from Envisat ASAR data Using a Parametric Inversion Scheme
Authors:
AuthorsInstitution or Email of Authors
Schulz-Stellenfleth, JohannesUNSPECIFIED
Lehner, SusanneUNSPECIFIED
Hoja, DanielleUNSPECIFIED
Nieto-Borge, Jose CarlosUNSPECIFIED
Date:2004
Journal or Publication Title:Proceedings of OMAE2004
Page Range:51584-1-51584-4
Editors:
EditorsEmail
American Society of Mechanical Engeneers, UNSPECIFIED
ISBN:0-7918-3672-X
Status:Published
Keywords:SAR, ocean wave spectrum, spectral parameters
Event Title:OMAE 2004, Vancouver, Canada, 20-25 June 2004
Organizer:ASME
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:07 Feb 2006
Last Modified:06 Jan 2010 22:34

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