Hack-Hook
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Wrong , cameras are of past today you can use a microSAR radar and have all weather mapping system that is not heavy and is far more accurate than usual cameras .Stop living in your dreamworld. Terrain contour mapping is unreliable at best for use at high altitudes, due to cloud cover. And at high altitudes, you need huge, heavy, expensive cameras to see the ground in enough detail from over 25,000 ft. Huge heavy and expensive is not going to work unless you also have something huge heavy and expensive to carry it, like the global hawk you showed. FYI, that costs $220 million each.
In the end, conventional INS and GPS is a more accurate, lighter, cheaper, more reliable system.
the problem with contour mapping is not the reliability, it relay with the fact that you must have a map of the area ready before hand and preparing a detailed and accurate map is not easy or cheap .