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NerfHerder ,

Luckily you didn’t need to leave this 60+ feet in the air

DirigibleProtein OP ,

What does that mean? I saw it on a concrete pole and I thought it looked interesting.

NerfHerder ,

Its used by a topcon or similar device. The device is used to map out 3D space using these points as Z, Y, Z distance markers from the device.

DirigibleProtein OP ,

I thought with the target thing it was some kind of survey mark. Thank you for the explanation!

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