Whoa, impressive. I'm mainly interested in topography for climate purposes (at least for now), so I figure I don't need to be quite that detailed. Broadly speaking, how do you figure out which regions should be at which elevations? From what I've seen it seems like "subduction zones and continental collisions are high, and things get lower as you move further away" is a decent rule, but I'm sure that's a gross oversimplification.