Question: How to get Distance From Two Points in Physical World?

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Picture yourself looking down on the picture. What technologies are out there that could help me find the distance from points x,y,z (markers) to the soldier (in feet or meters) giving me the ability to triangulate his position in relation to the battlefield (square)? GPS can not be involved. Thanks! I should have been more specific… I’m trying to do this in real time, so unfortunately no tape measures etc.

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