Making your own ground control points

Who has made their own Ground Control Points (GCPs)?

I’m going to set up a number of GCPs at a site where I will be carrying out regular drone surveys (it’s a developing quarry site, for info).

The GCPs will be picked up by the quarry surveyor using accurate equipment.

I’m thinking of popping along to the local B&Q hardware store and purchasing some thing sheets of plywood, white and black paint, and making GCPs approximately 40-50 cm wide with a large white/black painted cross on which…

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