ANALYSES ON THE SEA SURFACE WIND FIELD DATA BY SATELLITE REMOTE SESING(SAR)

摘要

The microwave of SAR can observe the ocean in spite of severe weather or night time. The sea surface image of SAR has various informations about oceanic phenomena related to surface wind fields. The extracted wind information from SAR can be diversely used. In order to extract sea wind speed from SAR image, a generated wind direction from SAR and sigma nought should be input into wind model. Therefore, wind speed can be obtained by input wind direction into CM0D5 Model. Azimuth angle using CMOD5 Model is generated by added 90°to Look angle which is extracted from SAR data file. A gained wind direction spectrum from SAR image has 180°ambiguity because of 2D-FFT. This ambiguity should decide to use the location of land, wind direction in field or the result of numerical model. Consequently, wind direction using 2D-FFT is 3°～7°differences with actual surveying data. Wind speed by CM0D5 model is similar to actual surveying data as below 2m/s.