Hey all.
Anyone can build a track from photos, maps etc and call it their own, but in getting the elevations etc correct you need to guess a lot, go by feel, or obtain accurate survey data from the owners of the land.
Using Bathurst as an example in Australia.. To get the council's high accuracy survey data (40cm elevation changes for instance), the council charge an exorbitant amount of money as their staff had to spend days and days standing in the sun getting it right.
Also if you need/wish to survey the land yourself (to get the tracks to the current evolution standard), you need permission from track owners to laser scan their tracks (and if you do not have the equipment, it can cost thousands to hire). For Bathurst, I would also expect a permit to be needed to survey a public road. Not to mention building a representation for commercial use (rF2 ISI tracks), you couldn't use all the sponsors on track unless you obtained permissions.
Look at ISI's non-licenced representations, and check out the sponsors names and styles (Parabolic looks a lot like Panasonic, Trackmaster like Bridgestone etc). I would be more expecting that these sponsorship reasons also came into play for the naming.