I am having problems with my DEM. The details are mostly correct but i get convex/concave dems and large rifts when using photoscan for dem generation from aerial imagery. Would it be valid to use the global dem (Aster DEM or worldDEM V3) as ground control points without manual correction? If so what would be the correct processing method?
What i have done before is extract a ground control point for every 30 meters and loaded these values as ground control points. However, when i optimized camera's based on the ground control points my whole sparse point cloud would tilt way too much and neither the camera's nor the ground control points would still be in the bounding box.