We are running a pilot project to prove that a model produced using aerial photography and Pix4dmapper can provide results that are within a centimetre of the results produced by a Total Station. To do this we would like our point cloud and mesh to use the location of the Total Station as the datum for the coordinate system.
We are using GCPs from Google Earth. Ideally we would like to use WGS84 for our images and GCPs and an arbitrary system for our point cloud and mesh, but other approaches that will work are okay.
We have been able to produce a point cloud in an Arbitrary output coordinate system from which we can confirm that distances in our model match those from the Total Station within an acceptable margin of error.
Where we need help is changing the origin and orientation of the output coordinate system to match the Total Station. We have tried using Site Calibration, but this does not seem to produce the desired results – or we are not using the correct approach to selecting the values we enter.
So far we have been creating an MTP at the location of the Total Station and another at the back-sight and using the location of these MTPs and the orientation of a polyline between them to determine the factors to enter the Site Calibration parameters. However, the resulting coordinates are incorrect and the point cloud and GCPs are sometimes completely separated.
Any advice or guidance would be greatly appreciated.