I am fairly new to the UAV mapping world, I’ve been doing manned aerial surveys for the past 3 years with digital, film, and lidar sensors, though they are similar, there are definitely differences.
We’ve been mapping fairly square and rectangular parcels with a phantom 3 with varying degrees of success.
We have a corridor project of a 4 mile long winding road that has a lot of terrain relief. We need to map the road and 25 feet from centerline on both sides.We’re flying this with a phantom 3
How many ground control points and where would be optimal locations to place them? I’ve read the more the better and staggering them is ok but pairing the GCPs in the corridor is best. We are hoping for 2-3 inch accuracy. See attached image for the corridor. Right now I am up to 27 GCPs staggering them on either side of the road and 51 GCP total if I want to have areas that have GCP in pairs. It seems like this could be overkill but I don’t know.
Any help would be much appreciated. Thanks!