High-resolution wind fields from satellite-borne SAR

Jochen Horstmann; Wolfgang Koch; Thomas Konig; Susanne Lehner

doi:10.1117/12.511440

26 February 2004 High-resolution wind fields from satellite-borne SAR

Jochen Horstmann, Wolfgang Koch, Thomas Konig, Susanne Lehner

Proceedings Volume 5233, Remote Sensing of the Ocean and Sea Ice 2003; (2004) https://doi.org/10.1117/12.511440
Event: Remote Sensing, 2003, Barcelona, Spain

Abstract

An algorithm is introduced, which is designed to retrieve high-resolution wind fields from C-band synthetic aperture radars (SAR) operating at both vertical and horizontal polarization. The wind directions are extracted from wind-induced streaks, which are approximately in line with the mean wind direction near to the ocean surface. The wind speeds are derived from the normalized radar cross section (NRCS) and image geometry of the calibrated SAR images, together with the local wind direction retrieved from the image. Therefore the semi empirical C-band model CMOD4, which describes the dependency of the NRCS on wind and image geometry, is used. The CMOD4 was originally developed for the scatterometer of the European remote sensing satellites ERS-1 and 2 operating at C-band with vertical polarization. Consequently CMOD4 requires modification for horizontal polarization, which is performed by considering the polarization ratio. To verify the algorithm, wind fields were computed from the European satellites ERS-1/2 and ENVISAT SAR as well as the Canadian satellite RADARSAT-1 and compared to results from numerical models and a scatterometer.

Citation Download Citation

Jochen Horstmann, Wolfgang Koch, Thomas Konig, and Susanne Lehner "High-resolution wind fields from satellite-borne SAR", Proc. SPIE 5233, Remote Sensing of the Ocean and Sea Ice 2003, (26 February 2004); https://doi.org/10.1117/12.511440

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KEYWORDS

Synthetic aperture radar

Satellites

Polarization

Atmospheric modeling

Data modeling

Image retrieval

Coastal modeling

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