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Hello, with our small UAV <5kg (incl. camera) we are planing to document an archaeological excavation site. The area is about 35 x 50m large. We use the photogrammetry software aspect3d (www.aspect3d.de) for computing the pictures. Right now we are in the testing phase and we realize that we need Ground Control Points for geo-referencing to achieve more accurate and faster results. Does anyone has experience working with GCP? How many GCP will we need for an area that size and how large should these be when flying about 15-20m high? Or the other way around: are there standard sizes for which we are to fly at a certain height? Where are these GCP available to buy (weatherproof) in the EU? Maybe there are free files existing on the net to print out our ourselves? We (two fellow students and I) have been photographing just with tripod so fare but no GCPs. The results were pretty astounding (with objects small and medium). But with an entire area how would we go about taking additional pictures from the ground additionally to the photos from the UAV? How many GCPs and which size would we then need from the ground? (Sorry for the long and probably naive questions but we are just getting started and we will have only a small window to do the flight and ground photos - so we are a bit desperate). Many thanks in advance!