I want to ask a question about S1 coregistration.
I have multi-temporal S1 GRD data all ascending, and I calibrated them to sigma nought and geocoded them by using Range Doppler terrain correction. When i output all of them into ArcGIS, i found the multi-temporal stack have very good alignment- subpixel accuracy.
My question is about in order to make layer stack, is it necessary to to the coregistration or not? Since the alignment is already very good.