External Terrain
The “External Terrain” layer type basically corresponds to the “Terrain Proxy” layer type and is used when digital terrain models (DTM) are to be displayed in three dimensions.
In addition, with “External Terrain” the terrain is supposedly loaded from an external server. This “trick” improves the loading speed of your terrain in PlexMap 3D.
“External Terrain” is therefore helpful if you want to display extremely large terrains.
Note: You need a license for PlexMap 3D to be able to create and display layers of the type “External Terrain”.