Im trying to create a DEM. I have taken imagery from a drone and added the photo's. My photo's are not tagged, they do not have any information tied to them. I do have Propeller marker points that I collected while in the field. As I do my processing, my DEM points seem to be say off. My elevation (South Louisiana) is around .2 - 3 meters. When I export my cameras and import them back in, I get and where from 7 to 10 meters for the photo's. I think I missing a step. I there a workflow for DEM that lays the process out. Not sure when to add my coordinate system ( before or after alignment). Any help would be greatly appreciated.