Ohh, sorry, I forget acronyms are really just nonsense if you don't use the whole name first. Middle Earth Digital Elevation Model Project, and it is much easier to post a link than explain it, so here is a link.

I feel the need to waffle on about it, but I have another interview in a bit (who does interviews for employment at 1045 pm anyway, by the time it starts I will have been awake for 18 hours, and not to cheery ), so I will just say, Middle Earth, Terrain, Maps, Tolkien, and more terrain.
SeerBlue