SRTM - Bug
In GLobalMapper 15, I used to be able to take a Geotiff, and export it to SRTM 1, and it would work. I could re-import the HGT file and the DSM would look ok, with less resolution.
With Global Mapper 19, the result is wrong.
It looks like the bug comes from a mix of projection and unit. Geographic, WGS84 seems to be ok