RELATED IDEAS
Reverse Z on AT
Came across this problem: A bunch of aerial photo's without GPS coördinates, the location in a sepperate txt file. After AT the reconstruction was heading up instead of down, even when using the option : "Structual aerial photo set". This also happened when using a movie as input, but the movie was vertical instead of horzontal.
The idea: a "new" AT option or re-AT-option "flip Z"
If using GCP then check if XY is not inverted for you coordinate system if so the model will be flipped.
The options nadir only or structured doesn't do anything useful.
For photos without GPS coordinates it would be useful to be able to fix upside down issue.