Hi all. I’m running Terrain Flattering and Terrain Correction of Sentinel-1 GRD products in SNAP 11.0.1 and 12 and experiencing artefacts similar to the ones, described in Artefacts in CopDEM 30m Auto Download - Microwave Toolbox / Problem Reports - STEP Forum, but there are noticeable differences and specifics.
First of all, only vertical artefacts appear (as in previous topic at the DEM tiles boundaries). No horizontal distortions are noticed.
Secondly, they appear only higher that 70 degrees north latitude. As far as I seen, everything to the south of 70 degrees is fine. Maybe artefacts reappear after 70 degrees south latitude, didn’t checked it.
Third, it happens with both 90m Copernicus DEM product and 30m one. With 30 m its a bit less noticeable, but still there. Changing resampling method also helps a little bit, but does not resolve the problem.
Forth, I checked generated DEM in Terrain Correction procedure and it present there.
It especially noticeable in more mountainous area, but on flat terrain you still can see it.
It also have to be noted that as in mentioned above topic, It was not an issue in SNAP version 8.
So I guess the solution, that was implemented in SNAP 10 patches did not affected mosaicking and resampling for DEM tiles of these Arctic areas, maybe because northern than 70 degrees pixel size changes and current version does not takes it onto account.
