| http://www.w3.org/ns/prov#value | - Actually I should say the height above ground mainly when coming in for a landing, if you have an altitude that is accurate within say 10 feet you can localize your landing much better and reduce damage also from landing.People have thought of laser range finders but they are a hard nit to crack given the timing and expense of the APD. Radar is a possibility as is differential baro altimeters, the
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