Reprojection with GCPs

[undefined Solutions]

Hello,

I serched online and in this forum but I did not found a solution to my problem...

I have a Pointcloud and two list of GCPs one with an EPSG-System an one custom coordinate system.

Is there a workflow to add the EPSG-GCPs and then match the custom-GCPs?
I am realy new to CloudCompare and feel a little bit lost -.-

Thanks

[daniel]

I guess you can use this tool: https://www.cloudcompare.org/doc/wiki/i ... itle=Align

And mind that you have to accept the Global Shit when loading the GCPs with an EPSG system (the original coordinates will be applied at export time - and that will be the same for the aligned GCPs)

[undefined Solutions]

Ok, this could work but I have ~70 point clouds and 100 GCP over all -.-
and all all GCP manually is not possible...
Perhaps you have an solution for me?

[daniel]

What's the relationship between the EPSG GCPs and the ones with a custom coordinate system?

Are you expecting some kind of auto-matching?

[undefined Solutions]

I do not know the exact relationship, I did only get thes two CSV-Files.

EPSG GCP-locations with one point cloud



local GCP-locations


It would help me already if it would be possible to load the list of Positions into this align tool...

[daniel]

Indeed!

Are the labels the same on both sides?

[undefined Solutions]

Yeah the Labels are on both sides the same points in different coordinate systems...

[daniel]

Can you send me a couple of example files? (global and custom GCPs)

To admin [at] cloudcompare.com

[undefined Solutions]

Sorry for the delay in answering...

I have since learned how to move from the coordinate system NAD83(2011) / South Carolina https://epsg.io/6569 into a local coordinate system. I have been given the following parameters:

Delta X: 497104
Delta Y: 338987
Rotation: 32.68° clockwise

Is this reprojection possible in CloudCompare?

Thanks for the effort!

[daniel]

Shifting would be easy (just use these Delta X and Delta Y as Global Shift when loading the GCPs). Then, for the rotation, you should be able to use the 'Edit > Apply transformation' tool?