lambert coordinates

[jb.barreau]

Hello,

I have to georeference a point cloud with cc and I would like to know if this is possible in lambert. The lambert coordinates are indeed big and even when I keep the global shift, the cloud, at the reopening of the file, appears striped...

Thank you in advance for your answers and have avery good day.

[daniel]

If you want to georeference a cloud, be sure to apply the translation as a global shift (I believe CC should ask you about this if you try to input big numbers in the 'Apply transformation' tool). Then be sure to save the cloud to a format that supports double precision (almost all but STL should do). And of course afterwards at loading time you'll have to accept to apply a global shift (it's only for display as OpenGL doesn't support big coordinates).

What was your workflow? Did you use another mean to georeference the cloud maybe?

[jb.barreau]

Hello,

Currently the file is ply. Can cc convert to stl without making a mesh (I do not see the format in save menu and I am not familiar with this format)?

We have calculated transformation matrix with reference points and our goal is to provide a georeferenced cloud. We have not tried other mean because we do not know.

Thank you for all your information.

[daniel]

STL files can only contain meshes. But you don't want to use STL (this is the only format that doesn't support long coordinates ;).

Did you compute the transformation matrix yourself then? Or did you use the 'Align' tool?

[jb.barreau]

Yes we have used the 'Align' tool. Do you think there is a better way?

[daniel]

No it's good. But when you imported the ground control points, were they properly shifted (i.e. with global shift info)? And did the registered cloud had the same global shift information? (you can check that in the clouds properties)

[jb.barreau]

Hello and sorry for my response time,

I solved by keeping only the first digits of the coordinates, it works well and it is convenient to retrieve data.

Thanks for all.