Hi Tom, let me know if you get more improvement with my suggestions ;-)
The mosaic algortihms could have some more fine tuning definitely, so i’ll be happy to test using your data to see if we can improve the results ;-)
The number of parameters APP needs to calculate for such a 25 panel are quite high, about 25 * 12 = 300
So 300 parameters need to be solved for several 1000s of stars.
But I know I can complicate the models further and possibly improve more.
About the thin plates: I was under the impression that your mosaic panels are previous integrations from PI. Aren’t they? If not, forget that I mentioned the thin plates… ;-)
Basically, if another program has done some registration on the data, it is usefull to know what kind of registration was used. A projective registration ( homographies ) only would be no problem. Otherwise it could be a problem.