until now I made 3D mapping and nadir photography without any ground control points.
Next week I'll have to map a terrain on a slope, and I would use ground control points to get precise results.
I'm using a DJI Phantom 3 Professional and Pix4D, I can fly between 15 metres up to 100 metres AGL. The area is about 500x150 metres.
How can I print and use GCP to get an accurate survey? Can I measure the distance between GCPs with a yardstick and then apply that distance in Pix4D?
Thanks in advance for anyone that will help me.