On Determination of Wind Vectors for C-band SAR for High Wind Speeds
Will Perrie(1) , Yijun He(2) , and Hui Shen(1)
Bedford Institute of Oceanography,
1 Challenger Dr. ,
B2Y 4A2 Dartmouth Nova Scotia,
(2) Ocean Remote Sensing Lab., Inst. of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Ocean wind speed and wind direction are estimated simultaneously using the normalized radar cross sections corresponding to two neighboring (25-km) blocks, within a given SAR image, having slightly different incidence angles, motivated by the methodology used for scatterometer data. The wind direction ambiguity is removed by using the direction closest to that given by a buoy or some other source of information. We demonstrate this method with 11 ENVISAT ASAR images and RADARSAT images from coastal waters of the North Atlantic. Estimated wind vectors are compared with wind measurements from buoys and scatterometer data. We show that this method can surpass other methods, even those with sufficient visible wind-induced streaks in the SAR images, to extract wind vectors. Particular tests include high-wind cases from the N Atlantic HurricaneWatch SAR archive.