That was my initial thoughts as I have worked with other photogrammetric software which have similar approaches. However I recently ran AT independently on two sets of photos (no control) and the relative orientation results were acceptable; when I combined the photos into one block the results were very poor. I used Google to get a few control points ( in-accurate) and added them to the two sets of photos. I reran AT using the 'control points for adjustment' and the 'rigid registration' options and the results were completely different. The 'control points for adjustment' (accurate) worked but the 'rigid registration (in-accurate) was very bad. I thought it would be the reverse seeing as how the control was in-accurate, hence my question. I have always used control points from ground survey in previous projects so I have never used the 'rigid registration' option. I will do some additional tests
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