I noticed some differences between elevations contained in STK Word Terrain tiles and other DTM (both SRTM and DTMs created by our company).
For example, over Hanoi most of the elevations are negative (about [-10…-20]). This is not the case in SRTM, in our own DTM and in Google Earth were elevations are positive (about [10…20]).
I would like to understand why there are such differences.
I’m wondering if this may be caused by STK-Terrain using a specific geoid ?
Thanks in advance,