Hi all,
As a brief background. I recently surveyed a site with my DJI Inspire 1 at 10m altitude over an area of about 300m X 300m. I created a dense point cloud relying on the camera's known position and selected "reference" before creating the point cloud, so the camera location was used (lat, long, and altitude above ground surface). The results are excellent and now it is time to go back and create a georeferenced model. This is where I have some questions.
Based on other forum topics it appears that the GCPs should be assigned after the initial photo alignment is done. Again, it would be nice to use the camera's known location in this step to speed up processing. I have dozens of very well located GCPs with elevation values. There is clearly a discrepancy between my GCP elevations (~3000m) and my camera altitudes (~10m above ground surface). When I bring the GCPs in and locate the markers, there is a large error do to this difference after placing the GCP points and "Optimizing Camera."
In a test model I went ahead and ignored this error and proceeded to create a dense point cloud and mesh. I exported the mesh as a TIFF and upon opening the model in ArcGIS it appears it used the marker elevations. Is there a cleaner way to do this? The thing is, I would like to use the camera's known position to help on processing time, but wondering if I need to bring the photos in without spatial data to make sure I am not introducing some error into the model.
Any help/discussion is greatly appreciated.