Using Ground Control Points in Alignments

[pauldanc24]

I have a project with about 1000 photos. If I bring in the ground control points with their coordinates and mark them, can I then do an alignment with a reference preselection that will use those markers as the reference? Is this better than generic preselection. I have enough ground control points so that a GCP appears in most photos.

Thanks for all the advice I have received already on this project. Much appreciated

[stihl]

Hi Paul,

If you mark your GCPs in the photos before the alignment, then you can use the alignment with pair-preselection Reference
This means Photoscan will use available reference data is possible (such as camera coordinates or GCPs (have to be marked))
This way Photoscan knows which images belong together which speeds up the alignment.

[Alexey Pasumansky]

Reference preselection actually uses only the orientation/position information from the cameras, not the markers. Coordinates of the markers will be used after the matching is finished for the camera locations estimation process.

[stihl]

Thanks for your clarification Alexey.