The reason that I ask is that Skyrim and all other outdoor games use a standard, but dated method to generate and render terrain. There is a rather new technique, geometry clipmapping, that allows for terrain rendering in real time on a planetary scale on current hardware. I would like to try to make a terrain engine based using this technique and would like to recreate Skyrim's landmass as a test. However, there isn't much point in making a planetary-scale terrain engine and then testing it with a compressed landmass.
Anyone have any ideas?

