[Feature Request] Add GCP functionality about nodemicmac HOT 12 CLOSED

GCP for NMM are used in the aerial triangulation. GCP support was recently committed to master
Thanks @pierotofy for the path bug fix

from nodemicmac.

A good starting point could be the GCP class in ODM https://github.com/OpenDroneMap/ODM/blob/master/opendm/gcp.py which already does some parsing.

from nodemicmac.

The MM GCP format is as follows:

3d_gcp.txt:
GCPNAME UTMX UTMY ELEVATION PRECISIONXY PRECISIONZ

2d_gcp.txt:
GCNAME IMAGENAME PIXELX PIXELY

PRECISIONXY and PRECISIONZ is the surveyed precision error in meters.

from nodemicmac.

Wonder if we could make a parser to conform to the GCP format already used by ODM.

from nodemicmac.

Yes, I suppose that would be ideal. Having two GCP formats wouldn't make anyone happy.

from nodemicmac.

PRECISIONXY and PRECISIONZ is the surveyed precision error in meters.

Are these required, and if unknown, are there suggested dummy values?

from nodemicmac.

I'm thinking you could just set this to a low value; I think it serves the purpose of allowing for different weights, in case you have survey points of different precision.

from nodemicmac.

Yes they are required but I usually use 0.05 for each value -- it seems to be a good generic / universal value for most GCP missions. It helps loosen or tighten the GCP bundle block adjustment depending on the value used.

from nodemicmac.

Format questions/differences aside, GCPs could be used with NodeMICMAC now, or is additional work needed?

from nodemicmac.

Would need to add some logic into the run.py to detect GCP files and use them if formatted properly. it isn't a big amount of work. The larger task would be detecting a gcp_list.txt and converting it into the proper format for MicMac (which requires 2 files.. one 3D (real world) and another is the image list and X/Y target locations)
I'll take a look at opendm/gcp.py this tonight

from nodemicmac.

Awesome. Thanks!

from nodemicmac.

Once, the GCP can be used in NodeMICMAC, are the GCP used to imrove the prosessing or - as I understand it in ODM - just at the end to stretch and fit the finished results?

Side question: could NodeMICMAC already use GCPs if they where in the right (2 file) format?

from nodemicmac.