Altho I only have the demo of infinite, it seems you can import a fair number of formats of  terrains that accept ecosystems well. Be aware that placement of foliage/vegetation can be controlled by bit maps making for very accurate placement of the elements. I primarily use Imagine3D but it exports a fine .lwo , one of which I have tried in Vue5Inf DEMO, and it accepted eco well.Is there some way you could get a DEM of the site as, turned into a greyscale and blurred a bit, you might just be able to do a good one with the picture function in the terrain editor.

Hope some of this was helpful.....

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again