I was wondering how the quality (resolution) of the DEM used for back-geocoding during the S-1 TOPS Coregistration affects the accuracy of the of the process.
I have to work over an area in Finland and of course SRTM is not available. I am considering using ASTER or the DEMs provided by a national authority (2, 10, 25 or 200m)
Any idea on that? From my experience, the DEM resolution should be as closed as possible to the pixel size of the image.