How are they creating the tracks? Is there a track editor? The rF1 version of the track is pretty accurate. Again, I wish I could go drive the track with some sort of app running on my phone, export the data and then import it into some kind of track editor with these games. That would open up unlimited tracks and would be so cool. Then I could just go drive the thing this weekend and be done.
Most of the modders use GPS data, Google Earth (Pro) & the like to get the general layout mapped. Then, using a program like 3DSMax, layout the framework (mesh) for the track and the surrounding area. Then they need to apply textures to said mesh. Then they need to program the AI to go around the track. Then they need to do a bunch of other stuff too.
I remember your phone app idea. While neat, it will probably never work. It may be able to get the basic layout someday, but you still need to create the mesh, apply textures, create AI, animations, etc.
Another good one down here in Texas is COTA:
http://circuitoftheamericas.com
I'd love to drive that one some day (both in person and in a sim).
MX
Circuit of the Americas is already available in Simraceway & Game Stock Car. Simraceway isn't my favorite game, but Game Stock Car is fantastic. It's only $20 too.