I have been using Pix4dmapper to generate contour lines and have had little to no success with consistency between flights that are sometimes flown in the same day. We take at minimum 5 ground control points and use them in the flights and the contour lines are sometimes 5-6 feet off in the area around these points. I have rematched and re-optimized several times but i’m still getting one point in particular that is 6 feet off of a confirmed GCP.
We do use the rapid/low res function to run all of ours flight because we haven’t seen a dramatic difference between running the standard processing. With this flight in particular I have areas that are dead on when comparing GCPs to the surrounding contour lines and some that are way off.
We are trying to determine quantities from an overburden stripping project and it is nearly impossible to do when these lines are so inconsistent. Any insight on this is appreciated.