How many GCP's?

[John_Brady]

I am also curious about how things turned out and were additional points used for checks and if so how many?

I have looked through:

https://community.pix4d.com/t/5081-Number-and-distribution-of-GCPs-in-Corridor-Mapping-?page=1#community_comment_115004227606&gsc.tab=0

https://support.pix4d.com/hc/en-us/articles/202559299-Number-and-Distribution-of-Ground-Control-Points-GCPs-in-Corridor-Mapping#gsc.tab=0

https://support.pix4d.com/hc/en-us/articles/202557459#label6&gsc.tab=0

It is hard to determine the amount of GCPs to utilize in corridor mapping.

I am looking at a corridor that is 3 miles (5km) by 200 feet (60 meters).

We are hoping to get +/-0.10 feet (+/- 3 cm) of accuracy.