I am having trouble getting my control points to match the coordinates that my surveyor shot in the field. After reviewing the AT I realized there are photos that the AT is not accepting, which is casuing my model to be distorted. The control points on the 3D view are shown in blue. The photos that are not accepted are under the model in black. These photos are all clear, and from the exact same camera and mission. Does anyone know what would be causing this issue?
It is known problem of Contextcapture for dealing with long linear objects it doesn't have some "cosmological constant" to straighten it up and seems GCPs are not used for correcting camera calibration only for aligning model.
Which version you are using as latest should have improvements regarding this but honestly I would not count on this much as none of CC improvements regarding aerotriangulation have given any noticeable better results and none of the block options make difference either .
What you have to do is split this in multiple blocks and leave some common GCPs on edges between blocks and later after aerotriangulation you can merge them together. Another option would be to reuse calibration from same camera but done on 3D object so it better deals with this distortion and could give straight flight even without GCPs and then only use them afterwards. Our approach is run AT twice as running with GCPs first may hide issues with calibration.
Thanks Oto, I didn't ralize these limitations although I've experienced it before and just thought it was a data acquisition problem. I'll try your advice
It is related to this - https://communities.bentley.com/products/3d_imaging_and_point_cloud_software/w/wiki/28536/the-model-appears-to-be-curved-instead-of-being-horizontal-after-at
When there is only vertical views with little 3D features then it is not enough details to calibrate camera and the calibration error shows up in long run.
Oto, I was able to successfully break this up into 5 blocks, I put all 5 blocks on the correct GCP's (they are allmostly green), however when I went to megre them, it created multiple GCP's at the same location, is there a procedule to turn these into tie points instead? Did I still need to use control points for adjustement? or should I use rigid registration? Any thoughts?