Forum

Author Topic: How to split huge projects?  (Read 2836 times)

c-r-o-n-o-s

  • Jr. Member
  • **
  • Posts: 91
    • View Profile
How to split huge projects?
« on: July 03, 2021, 09:58:32 AM »
How do you divide your projects in chunks? (and merge them at the end)
We have kilometres of thin geometry with round about 8000 pictures.

I've tried a few things, but I'm not sure I've reached the optimum yet.

The image alignment should, I think, run completely with all images in one chunk.  (For perfect bundle block adjustment)

If I now cut the thin point cloud hard in the middle, the edges of the dense point cloud become quite inaccurate.
You can NOT just make a cut in the middle, because then the edges of each part will get a bad confidence.
So you would have to cut with overlaps.

This makes it a bit more complicated when you join them together later.

Does anyone have a "nice" solution?
« Last Edit: July 03, 2021, 10:26:11 AM by c-r-o-n-o-s »

c-r-o-n-o-s

  • Jr. Member
  • **
  • Posts: 91
    • View Profile
Re: How to split huge projects?
« Reply #1 on: July 06, 2021, 11:52:14 AM »
I took another look at the python script (split chunks).

https://github.com/agisoft-llc/metashape-scripts

It actually works very well!
However, it creates a small "seam" at the edges that is somewhat "inaccurate".
At least the confidence is lower there.
It would be practical if you could set an overlap of approx. 1% when creating, and make it smaller by 1% again when merging.

I am also missing the confidence setting when creating the point cloud with the scipt.

Why I have not done the boundary via the "region" so far:
Sometimes it calculates only half or a very bad and inaccurate point cloud in the region.
If I make the region a little larger, it sometimes works or gets better.