I found this really interesting post on a forum i was looking through. and its able to create almost perfectly accurate heightmaps of an area of the World. Transport Tycoon Forums • View topic - How To: Generate Superb Heightmaps :) If these heightmaps can be generated and then Scaled to fit the size of BF2 or 1942, you could have some extremely realistic looking maps!
Doesn't look more or equally accurate as actually converting topographical maps and looking at pics of the area in a roughly 1:1 ratio. But if you're doing a map where you want to squeeze a whole battle that took place across a relatively large expanse into a 4Km by 4 Km map the detail would be pretty damn good...nice find!