Sentinel-1 A- extracted DEM

In general S-1 is not recommended for DEM creation ,But in case S-1 is the only available solution, please put in mind the points are mentioned in the following post,

Selecting Images for InSAR DEM generation, Source of the post

It’s incomparable between S-1 created DEM and SRTM1 for the reasons are mentioned in the following post,

Incomparable DEM resulted from S-1 pair and SRTM, Source of the post