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.
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