CloudCompare forum

Hey Daniel, I was wondering what is the direction of the M3C2 distances. I mean are they absolute distances, i.e. sqrt(dx^2 + dy^2 + dz^2)? Can they be split into x, y, and z components? I used multiscale calculation mode and the orientation for the normals was set to +Z (See attached picture) [/img...

Also, I have built 5 different classifiers based on ground points and non-ground points taken from different parts of the site (non-ground data included 2 to 3 houses), but the pblm persists.

Asghar.

Dear Dimitri, I haven't tried RGB based filtering but the problem is that the color of the roofs (grey) is very similar to other features (e.g. roads) which might cause pblms. Filtering based on gradient sounds interesting. I'll try it soon and will come back to you. And my point cloud is very dense...

Thanks Dimitri and Daniel. The pblm is that this site involves very steep slopes (40 to 60 degrees), so I guess the second option wouldn't work either. Now I must admit CANUPO has done a tremendous job on slopes in general and specially on steep and rough/eroded surfaces with erosion gullies. I'm ex...

Dear Daniel, I'm classifying a photogrammetric derived point cloud that represents a forested environment with a few buildings. I built the classifier using manually classified ground points and non-ground points from a part of the entire PC. The non-ground sample contained point corresponding to ve...

Hey Daniel! I used a confidence threshold of 0.90 in CANUPO, which means points with confidence threshold lower than 0.90 were neither classified into ground class nor to non-ground(veg) class. When I use Edit>Scalar Field>Filter by Value, it gives me two point clouds representing the two classes (i...

You're right! I don't have the ground truth for the whole point cloud. I only used a part of the whole point cloud to train my classifier.
Could you please tag Dimitri to this post. I haven't seen him on the forum recently.

Regards,

Umair.

Dear Daniel, I want to calculate Balanced Accuracy (ba) and Fisher Discriminant Ratio (fdr) for a point cloud classified by qCANUPO. ba and fdr for my trained classifier was ~97% and 9.8, respectively. Does that mean these values are same for the classified point cloud too? My personal thought is th...

@Daniel,

Both have the same shifts. Also, I opened both clouds at the same time by file>open and multiple slection using ctrl key. The problem persists.

Regards,

Umair.