Search found 22 matches

by uasghar
Thu Sep 14, 2017 8:11 pm
Forum: Questions
Topic: M3C2 Distance Direction
Replies: 1
Views: 1865

M3C2 Distance Direction

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...
by uasghar
Fri Jun 23, 2017 3:18 am
Forum: Questions
Topic: Building extraction using qCANUPO
Replies: 6
Views: 8926

Re: Building extraction using qCANUPO

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.
by uasghar
Fri Jun 23, 2017 3:14 am
Forum: Questions
Topic: Building extraction using qCANUPO
Replies: 6
Views: 8926

Re: Building extraction using qCANUPO

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...
by uasghar
Sat Jun 17, 2017 9:31 pm
Forum: Questions
Topic: Building extraction using qCANUPO
Replies: 6
Views: 8926

Re: Building extraction using qCANUPO

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...
by uasghar
Wed Jun 07, 2017 8:18 pm
Forum: Questions
Topic: Building extraction using qCANUPO
Replies: 6
Views: 8926

Building extraction using qCANUPO

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...
by uasghar
Thu Apr 27, 2017 5:58 am
Forum: Questions
Topic: How to extract Unclassified Points in CANUPO
Replies: 1
Views: 2083

How to extract Unclassified Points in CANUPO

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...
by uasghar
Thu Feb 16, 2017 10:51 am
Forum: Plugins
Topic: How to calculate Balanced Accuracy and Fisher Discriminant Ratio?
Replies: 2
Views: 4071

Re: How to calculate Balanced Accuracy and Fisher Discriminant Ratio?

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.
by uasghar
Wed Feb 15, 2017 1:50 pm
Forum: Plugins
Topic: How to calculate Balanced Accuracy and Fisher Discriminant Ratio?
Replies: 2
Views: 4071

How to calculate Balanced Accuracy and Fisher Discriminant Ratio?

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...
by uasghar
Sun Jan 15, 2017 4:33 pm
Forum: Questions
Topic: M3C2 core points and direction of distances/normals
Replies: 8
Views: 5376

Re: M3C2 core points and direction of distances/normals

@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.
by uasghar
Sun Jan 15, 2017 7:12 am
Forum: Questions
Topic: M3C2 core points and direction of distances/normals
Replies: 8
Views: 5376

Re: M3C2 core points and direction of distances/normals

Canupo Classification Figure Zoom-In example.jpg
Canupo Classification Figure Zoom-In example.jpg (79.9 KiB) Viewed 5338 times