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SAR Ocean Wave Measurements Based on an Empirical Imaging Model

Niedermeier, Andreas and Schulz-Stellenfleth, Johannes and Nieto-Borge, Jose Carlos (2004) SAR Ocean Wave Measurements Based on an Empirical Imaging Model. In: 2004 IEEE International Geoscience and Remote Sensing Symposium Proceedings, pp. 4730-4733. IEEE. IGARSS 2004, Anchorage, USA, 20-24 September 2004. ISBN 0-7803-8742-2 (CD: 0-7803-8743-0).

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Spaceborne Synthetic Aperture radar is still the only instrument providing continuous wave measurements on a global basis. For more than a decade the European satellites ERS- 1 and ERS-2 have acquired about 1500 globally distributed SAR images daily. It is well known however that strong uncertainties exist in the SAR ocean wave imaging models used so far, which are either purely theoretical or semi-empirical. In this study a new empirical model for the SAR ocean wave imaging process is proposed. The empirical model is derived based on a global data set of ERS-2 wave mode spectra and collocated two-dimensional ocean wave spectra from the numerical ocean wave model WAM. A quasi-linear model function is fitted using a least-square minimization approach to calculate an optimal estimate of the ocean to SAR transfer function. The empirical transfer function is compared to the theoretical expression used in the literature. The quality of the empirical model is tested by comparison of simulated and observed SAR spectra. Furthermore the model is used to estimate significant wave heights based on a quasilinear inversion approach. Statistics as well as global maps of wave parameters are presented. The study is a contribution to the optimization of the operational use of global SAR data for the assimilation of numerical wave forecast models.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:SAR Ocean Wave Measurements Based on an Empirical Imaging Model
AuthorsInstitution or Email of Authors
Niedermeier, AndreasUNSPECIFIED
Schulz-Stellenfleth, JohannesUNSPECIFIED
Nieto-Borge, Jose CarlosUNSPECIFIED
Journal or Publication Title:2004 IEEE International Geoscience and Remote Sensing Symposium Proceedings
Page Range:pp. 4730-4733
IEEE Operations Center, UNSPECIFIED
ISBN:0-7803-8742-2 (CD: 0-7803-8743-0)
Keywords:SAR, ocean waves, wave spectrum, imaging model, empirical approach
Event Title:IGARSS 2004, Anchorage, USA, 20-24 September 2004
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 22:33

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