I don't know if what I ask is possible or not but let's try...
I have two datasets:
a DEM as a point cloud in a relative coordinate system, constructed with 3D algorithm structure-from-motion.
20 ground control points with absolute elevations values (between 130 and 140 meters) taken with a GPS.
20 points of the point cloud representing the GCPs in the relative coordinate system (georeferencing targets visible on the point cloud).
I would like to constrain the elevation of my point cloud DEM with the GPS ground truth elevation, in order to have a DEM with absolute elevation calibrated to my study area.
At the moment, the study area is about 1 hectare and with slopes around max. 20% but the aim is to export the methodology in river catchment with a size of some kilometers-square and with max. slopes around 60%.
Any help is welcome, preferably in ArcGIS or R but I can deal with other softwares if necessary!
Thanks for the help.