A question about S1 GRD coregistration


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.


In this case you could apply collocation, collocate two, or more spatially overlapping products.

Raster---->Geometric Operations----->Collocation