Does anyone know of a sensor (not too expensive) that could let a UAV know it’s altitude relative to the ground height not sea level? I guess what I am asking is…..
Is it possible to hold a UAV’s altitude at say 400 feet above the ground regardless of the changing height of the ground during a flight path?


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How about the laser range finders for hunters...or....measuring tools from home depot that use laser light. another posibility might be cheep sports radar baseball units or golf swing radar things.?

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