3DFOREST / Discussion / General Discussion about 3DForest: Strange Segmentation Occurring

Anonymous - 2019-06-19

Hi there,

I seem to be getting very weird segmentation. I am guessing maybe the axis are incorectly represented (see image).

Any ideas?

3Dforest01.JPG

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Anonymous - 2019-06-19

Here is another image.

112331.JPG

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- Janek - 2019-06-19
  
  HI
  this problem occurs when wrong transformation matrix of project is used. Do
  you know extent of your cloud? is yes please send me those coordinates and
  I will send you values for transformation matrix that can be used.
  Jan
  
  st 19. 6. 2019 v 15:12 odesílatel noreply@sourceforge.net napsal:
  
  Here is another image.
  
  Attachments:
  
  112331.JPG
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  (119.2 kB; image/jpeg)
  
  Strange Segmentation Occurring
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Anonymous - 2019-06-19

Are the details that you need given in this image? (Bottom Left)

3Dforest02.JPG

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Anonymous - 2019-06-19

Is it normal for the point cloud to be separated into these parrallel lines?

3Dforest03.JPG

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Anonymous - 2019-06-19

I think the parallel lines are an artifact of previous sub-sampling

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- Janek - 2019-06-19
  
  You Need values named As global shift in your screenshot. When creating
  project, try to insert those values As new transformation matrix. Then
  import cloud and sebe if the cloud looks normal or similar to present
  state. If it not help use - oř + value in matrix...
  
  Dne st 19. 6. 2019 19:08 uživatel noreply@sourceforge.net napsal:
  
  I think the parallel lines are an artifact of previous sub-sampling
  
  Strange Segmentation Occurring
  https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/?limit=25#b9b1
  
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Anonymous - 2019-06-25

Hi Janek,

Thanks for that, I managed to import without the parallel lines problem thanks to you advice on the tranfomation matrix. I used (x = -628400.00, y = -6891200.00, z = 0.00).

However, now I have problems with Terrain and Tree segmentation. See the picture

My Vegitation includes a lot of terrain and my trees are sementing as a clusters of Trees instead of individual trees. I assume this is becuse my parameters are incorrect; so I included the parameters that I used.

I'll keep troubleshooting nevertheless.

3Dforest0341.JPG

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- Janek - 2019-06-26
  
  Hi, problem with terrain Is understory vegetation that can be solved
  increasing to 12 or 15 cm instead of 10.
  
  Better terrain segmentation can help also with vegetation segmentation. In
  coniferous forest can help also decrease od values ito 3 cm Voxel size and
  multiplicator to 2.
  Jan
  
  Dne út 25. 6. 2019 16:53 uživatel noreply@sourceforge.net napsal:
  
  Hi Janek,
  
  Thanks for that, I managed to import without the parallel lines problem
  thanks to you advice on the tranfomation matrix. I used (x = -628400.00, y
  = -6891200.00, z = 0.00).
  
  However, now I have problems with Terrain and Tree segmentation. See the
  picture
  
  My Vegitation includes a lot of terrain and my trees are sementing as a
  clusters of Trees instead of individual trees. I assume this is becuse my
  parameters are incorrect; so I included the parameters that I used.
  
  I'll keep troubleshooting nevertheless.
  
  Attachments:
  
  3Dforest0341.JPG
  https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/dff6/attachment/3Dforest0341.JPG
  (1.1 MB; image/jpeg)
  
  Strange Segmentation Occurring
  https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/?limit=25#dff6
  
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Anonymous - 2019-07-01

Thanks a Million Janek,

This is starting to look great. Most of my problems are now solved and I am continuing on. I'll likely have a few more questions in a week or two. Thank you kindly for the very useful support.

All the best.

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Anonymous - 2019-07-25

Hi all.

I have succeded to segment 500+ trees. But I have a strange artifact. The bottom of each tree looses most of its points in the segmentation process. Is there a way I can get these back. I would like to have them so that I can look at the trees in other software too.

1232213.png

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- Janek - 2019-07-25
  
  Hi can you Tell me what version you are using? And what parameters Are
  set?
  Jan
  
  Dne čt 25. 7. 2019 14:23 uživatel noreply@sourceforge.net napsal:
  
  Hi all.
  
  I have succeded to segment 500+ trees. But I have a strange artifact. The
  bottom of each tree looses most of its points in the segmentation process.
  Is there a way I can get these back. I would like to have them so that I
  can look at the trees in other software too.
  
  Attachments:
  
  1232213.png
  https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/095a/attachment/1232213.png
  (637.0 kB; image/png)
  
  Strange Segmentation Occurring
  https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/?limit=25#095a
  
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Anonymous - 2019-07-25

Here are the parameters.

I am using Version 0.42

11111.JPG

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Anonymous - 2019-07-25

I just noticed you have released version 0.5

I will give that a try now.

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Anonymous - 2019-07-25

I tried with Version 0.5 and it quit half way though.

I got 190 or 650(ish) trees.

I'll try again tomorrow.

1112211.JPG

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- Anonymous - 2019-07-25
  
  Got 190 "of"^^ 650(ish) trees
  
  (TYPO ABOVE)
  
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  - Janek - 2019-07-26
    
    Try to decrease number of elements when you set distance from the terrain
    smaller. I would use distance to 0.5 or 1 m that can help with tree
    segmentation.
    Jan
    
    čt 25. 7. 2019 v 21:09 odesílatel noreply@sourceforge.net napsal:
    
    Got 190 "of"^^ 650(ish) trees
    
    (TYPO ABOVE)
    
    Strange Segmentation Occurring
    https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/?limit=25#3d10/544e
    
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Anonymous - 2019-07-25

This time it got the whole tree though. I think what I did wrong was I had "distance from the terrain" set at 1.600

I think it should be more like 0.100

1121211.JPG

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Anonymous - 2019-07-27

It seems that when I reduce the "Distance from Terrain" to around 0.500, then I only manage to segment 30% of trees in the point cloud.

I need to get the points around the bottom part of the tree, becuse the harvester cuts the tree at around 40cm or so, sometimes even lower.

I am a MSc student from Uppsala University. Janek, perhaps we can connect via email or skype. I also have some very interesting data. Inculding values from the harvester after harvest on this 1ha plot that I have terrestrial LiDAR for. I have sent you my personal details via the messaging portal at www.3Dforest.eu

Thanks a tonne for the assistance!

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- Janek - 2019-07-29
  
  Hi
  sorry for long answer.when you input smler distance to the terrain reduce
  also nubber of elements to 20 maybe. that will select more trees. and try
  to use bigger input distace. that can create bigger voxels and do not
  exclude them. Hope this will help you.
  if any problems contact us via web page contact form or by mail
  j.trochta@gmail.com
  Jan
  
  so 27. 7. 2019 v 10:22 odesílatel noreply@sourceforge.net napsal:
  
  It seems that when I reduce the "Distance from Terrain" to around 0.500,
  then I only manage to segment 30% of trees in the point cloud.
  
  I need to get the points around the bottom part of the tree, becuse the
  harvester cuts the tree at around 40cm or so, sometimes even lower.
  
  I am a MSc student from Uppsala University. Janek, perhaps we can connect
  via email or skype. I also have some very interesting data. Inculding
  values from the harvester after harvest on this 1ha plot that I have
  terrestrial LiDAR for. I have sent you my personal details via the
  messaging portal at www.3Dforest.eu
  
  Thanks a tonne for the assistance!
  
  Strange Segmentation Occurring
  https://sourceforge.net/p/forest3d/discussion/general/thread/4822aaa1c0/?limit=25#c191
  
  Sent from sourceforge.net because j.trochta@gmail.com is subscribed to
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Strange Segmentation Occurring

tool for manage and process TLS lidar data from forest environment

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Strange Segmentation Occurring

I think the parallel lines are an artifact of previous sub-sampling

(TYPO ABOVE)

Thanks a tonne for the assistance!

Strange Segmentation Occurring

tool for manage and process TLS lidar data from forest environment

Forums

Help

Strange Segmentation Occurring document.SUBSCRIPTION_OPTIONS = { "thing": "topic", "subscribed": false, "url": "subscribe", "icon": { "css": "fa fa-envelope-o" } };

I think the parallel lines are an artifact of previous sub-sampling

(TYPO ABOVE)

Thanks a tonne for the assistance!

Strange Segmentation Occurring