I tried something a little different in the second try this morning.
The following process took me 12 minutes:
1. Go to Terrain.party and generate the heightfield for the area around Remagen.
![](https://farm5.staticflickr.com/4730/25227162028_32b4c2bdbc_b.jpg)
2. Load the heightfield into L3DT Pro.
![](https://farm5.staticflickr.com/4686/38383638654_a7c7ac5133_b.jpg)
3. Look at the mesh in L3DT and make adjustments.
![](https://farm5.staticflickr.com/4646/39093662591_54f73e625f_b.jpg)
4. Export the file as .OBJ format, and import it into AC3D.
![](https://farm5.staticflickr.com/4599/38383599974_b7a9274dac_b.jpg)