Official comment
Our Terrain Awareness feature operates off of satellite derived terrain data by default.
https://support.dronesmadeeasy.com/hc/en-us/articles/211810943-Terrain-Awareness
If you need another source you can create your own and use that:
https://support.dronesmadeeasy.com/hc/en-us/articles/360000745623-Custom-Terrain-Source-for-Terrain-Awareness
https://support.dronesmadeeasy.com/hc/en-us/articles/360021867012-Arbitrary-DEM-Preparation-for-use-as-a-Custom-Terrain-Source
Here are some other posts about this:
https://support.dronesmadeeasy.com/hc/en-us/community/posts/360043272532-Satellite-DEM
https://support.dronesmadeeasy.com/hc/en-us/community/posts/360043015711-terrain-aware
https://support.dronesmadeeasy.com/hc/en-us/community/posts/360021056312-Custom-Terrain-Update-
