An efficient geography registration method for InSAR coherent change detection

In this paper, an efficient geography registration method for INSAR coherent change detection is proposed. In the algorithm, considering Terra-SAR image, firstly we do geography registration on two images by oversampling the geography information in master image, then do coarse and fine registration. In coarse registration, find the range and azimuth shifts by calculating the cross correlation of the intensity sub-images that around ground control points (GCPs). In fine registration, calculate intensity cross correlation of sub-images that around GCPs to find the maximum of correlation map for getting range and azimuth shifts. In coarse and fine registration algorithms, time complexity is determined by the size of sub-image and number of GCPs. The proposed algorithm improves the efficiency while keeping the precision of registration. Experimental results obtained on acquired by Terra-SAR images confirm the effectiveness of the proposed approach.