I have a UAV image set that I have aligned, which looked normal and well oriented (no tilt). I linked 4 ground control points to the images and when I reprocessed 'Align Images' the model is now tilted at an angle. The model seems to be proportionately correct and without distortion, so perhaps I can just readjust the ground plane, but I though it was a strange result considering the model was level without GCP. Should I just ignore it? Thank you for any help.
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