Problem with merged chunk

[kiteman]

I have two chunk
one with Reprojection error 1.2 and the oteher with r.err. 0.8

After aligning them with the geo-referencing and merged into a single chunk.
The Reprojection error flew to 80!
And the error of georeferencing has worsened considerably, from 18 cm to 90 cm.
Why? How can I avoid this problem?
0.9.1 build 1647 6a bit

[Alexey Pasumansky]

Hello Stefano,

Have you used point based alignment for chunks or just merged using the fact that they are already referenced in the same coordinate system?
Have you performed optimization of the merged chunk?

[kiteman]

I  just merged using the fact that they are already referenced in the same coordinate system.
Now i try to optimize.

[kiteman]

I tried to optimize, and after merging chunk error has risen to 97, while the georeferencing has worsened to 1.8 m

[Alexey Pasumansky]

Hello Stefano,

And another question if you've merged markers and if there were markers with the same labels and if such markers have been placed correctly in both chunks (in the same position)?

Actually the optimization of the merged chunks will not be useful since there are no matches between photos from different chunks. But without the data it's quite hard to say what caused such great problems in case there were no problems with marker labeling in different chunks.