| Summary: | Synthetic Aperture Radar (SAR)-derived high resolution wind products are calculated from high resolution SAR images of normalized radar cross section (NRCS) of the Earth's surface. Backscattered microwave radar returns from the ocean surface are strongly dependent on wind speed and direction. When no wind is present, the surface of the water is smooth, almost glass-like. Radar energy will largely be reflected away and the radar cross section will be low. As the wind begins to blow, the surface roughens and surface waves begin to develop. As the wind continues to blow more strongly, the amplitude of the wave increases, thus, roughening the surface more. As the surface roughness increases, more energy is backscattered and NRCS increases. Moreover, careful examination of the wind-generated waves reveals that these surface wave crests are generally aligned perpendicular to the prevailing wind direction, suggesting a dependence of backscatter on the relative direction between the incident radar energy and the wind direction. This data set consists of high resolution sea surface winds data derived from SAR on-board RADARSAT-2 satellite. The basic archive file is a NetCDF4 file containing SAR wind, a land mask, and time and earth location information. Also archived are the maps of the SAR wind in GeoTiFF format. The product utilizes the CoastWatch product format and covers the geographic extent of the SAR image frame from which it was derived.
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