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- W2032185703 abstract "RADARSAT-1 ScanSAR SWA images of Hurricane Katrina are used to retrieve the surface wind vectors over the ocean.Due to the inadequate spatial resolution of the ScanSAR SWA images, the spectrum method cannot be implemented toestimate the wind direction. Instead, collocated H*wind wind directions are used as wind direction estimates. The windspeed is derived from the σ° by inversion of a C-band HH-polarization Geophysical Model Function (GMF), which isderived from C-band VV-polarization GMF using a polarization ratio model. Because existing polarization models don'tfit the ScanSAR SWA data well, a recalibration model is proposed to recalibrate the ScanSAR SWA images. Thecoefficients of the recalibration model are tuned using collocated H*wind surface wind fields. To validate the SAR-retrievedwind speed, the mean and the RMS difference between SAR-retrieved and H*wind wind speed estimates arecalculated. The mean of difference is small and the RMS for wind speed less than 25 m/s is below 4 m/s, suggesting thatthe high resolution wind retrieval algorithm can work under hurricane conditions. Except for the influence from rain, thelargest errors occur at high wind speed (over 25 m/s), which is mainly due to the saturation of the C-band GMF CMOD5." @default.
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- W2032185703 date "2007-09-13" @default.
- W2032185703 modified "2023-09-23" @default.
- W2032185703 title "RADARSAT ScanSAR wind retrieval under hurricane conditions" @default.
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- W2032185703 doi "https://doi.org/10.1117/12.732600" @default.
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