You can get a pretty amazing effect by saving to tga format.
Then edit TerMaps.cfg like so
[Map1]
Format=tga ;raw
Resolution=4320,2160,10000; map width,height(in pixels) and density(meters per pixel)
ZoomLevels=40000,20000,10000,7000; meters per pixel
Tiles=1,1
File=data\Terrain\Maps\Map1\4320_2160.tga ;raw
Be WARNED!!!
It's not gonna work like you might think!