Link to virtual Bucknell
The terrain is generated by Google Earth and a script which can convert mesh into standard terrain in Unity.
Here are some steps about how to extract terrain hightmap into 3d models.
1. Open Sketch Up
2. Click Add More Imagery
3. Choose your location and capture the model.
4. Click Toggle Terrain. If you cannot find the button, right click menu bar and choose Google.
5. Click File->Export and choose whatever format that is suitable to you.