Good evening. I was going through the process to determine ground deformation of a small area using sentinel 1 images. I was wondering why srtm is selected as default option for the DEM by the software. I understand other DEM can be used, but why srtm and not for example ASTER is automatically downloaded? A particular reason? Particular characteristics of this dem? Special algorithms in the software?
And for the deformation, as external DEM is it better a global DEM or a national elevation model?