Allign Scans and Fotos

[Dieter]

It would be great if there were a step-by-step guide on how to import referenced scans, set them as fixed, and then align photos to these scans without changing the scans' position. The official FreshDesk documentation says to move the scans into a scan group and set that group to fixed. But that means the entire group can be moved, so it doesn't help me.

Dear Agisoft team, please write down exactly how to do this. I spend hours on this task every time without really knowing how it works.

Please, please, create a detailed guide.

Thanks, Dieter

[JMR]

Hi Dieter: I've found a simple way.You can place, by eye and without worrying too much about where, three or more non-aligned points on one of your scans right after import so they take their absolute coordinates from your referenced scans. Then follow the awkward procedure that is meant to allow Metashape to tie photos and scans.
After that, check on the three points and update transform. All the chunk will turn back to the original global position.
It works, at least it is an easy escape from the situation to which the recommended procedure leads, which involves disregarding the georeferencing work of the scan as well as the very precise leveling constrained by the inclination sensors inside of your scanner.

Regards, José Martínez

[Dieter]

Hi and thanks for the answer,

i understand your approach, it's a good idea and easy to implement. However, I don't understand why it has to be so complicated and not explained clearly.

Thank you

Dieter

[Alexey Pasumansky]

Hello Dieter,

Have you tried to keep Lock Transform option for laser scans (and laser scan groups) before starting the matching process between images and laser scans, as stated in the notice in the beginning of the corresponding section of the article?
https://agisoft.freshdesk.com/support/solutions/articles/31000168474-terrestrial-laser-scans-processing-in-metashape-2-2#Processing-terrestrial-laser-scans-and-images