GCPs per acreage

I have been using Pix4d for a little while now I was wondering if anyone had any idea what a good amount of GCPs per acreage, and maybe how to lower the amount of GCPs needed and still stay accurate within 3cm.

Hi elliot,

There is no hard number of GCPs you should use. Like the legs of a table, you need your GCPs well balanced throughout your project area. The topography and shape of your area will play a significant role in how many points to set and where to set them. If your project area is very irregular, with lots of elevation changes, then you might want more GCPs than a square and relatively uniform area.