SCIENTIST'S IDEALISM VS. USER'S REALISM FOR ORTHORECTIFICATION OF FULL RADARSAT-2/COMPACT RCM POLARIMETRIC DATA WITH DSM

摘要

This paper presented two methods for the ortho-rectification of full/compact polarimetric SAR data: the polarimetric processing is performed in the image space (scientist's idealism) or in the ground space (user's realism) before or after the geometric processing, respectively. Radarsat-2 (R2) fine-quad and simulated very high-resolution RCM data acquired with different look angles over a hilly relief study site were processed using accurate lidar digital surface model. Quantitative evaluations between the two methods as a function of different geometric and radiometric parameters were performed to evaluate the impact during the ortho-rectification. The results demonstrated that the ground-space method can be safely applied to polarimetric R2 SAR data with an exception with steep look angles and steep terrain slopes. On the other hand, the ground-space method cannot be applied to simulated compact RCM data due to -17dB noise floor and oversampling.