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To make it actually works, I thought of a tripod for a camera, but that reduces greatly the interest for an easy field tool.

The math is nice if the numbers are available and acurate. I have an app on my tablet for tree's heigth. Fine, but no. I had a feelling of erratic/ ridiculous results. The main problem is me obviously because all depends of the reproductibility of the stance to take three mesures. Angle at known...