[OC] Survey Mark

DirigibleProtein@aussie.zone to pics@lemmy.world – 53 points –
4

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

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

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.

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