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That's a good point. Makes me wonder if that 2D mountain range projection could be used to 'search' through a 3D map for a match.
Coincidentally, I had exactly just that thought about a week ago whilst I was staring out at a nearby mountain. I have very little knowledge about this kind of problem, but to me, it seems like a solvable problem - there has been some interesting work in reconstructing 3D models from photographs of objects (I have a friend who did his masters in something similar) and I don't doubt that people working on that type of…
Doing it with 2d video and not having precise starting coordinates, speed/heading/altitude makes the search space larger but I think that is more than made up for by the fact that you're not trying to do it all on embedded hardware from the 80s.