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Point Cloud density when zooming

Brandy Lockhart
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Hello,

 I am working in Bentley map on a point cloud. I am having an issue with the density of the cloud when I zoom in to see specific features. I need to be able to select objects in the cloud and classify and clip them etc. but when I zoom in the point cloud appears less dense than it actually is and objects are difficult to distinguish. I originally thought that I had lost some of the points when the cloud was exported from Agisoft photoscan, however the overall point number is the same, but in Agisoft the cloud appears significantly more detailed than in Bentley map or Bentley Descartes (same issue with both versions). Is there a setting that I can change to improve this? I have included a screen capture from agisoft (bottom) showing a pipe in the point cloud and the same pipe at a similar scale as seen in Bentley (top image).

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  • 0 Offline

    In View Attributes what is Point Cloud Presentation Style set to? Try setting Style to RGB Color.

    Please look at attach information to see if answer your question.

     


  • 0 Offline in reply to fmcallis
    Hello Frank, The settings are on RGB the weights are appropriate and the density in point cloud advanced is set to 100. I figured out that when the point cloud is added it was being compressed so that no points within 5cm of each other were visible. I have re-imported a cloud with the compression set to "terrestrial Scan Data 0.001 (1mm), which is better, but if possible I would rather have no compression upon import and control the point density through the point cloud advanced tools so that all of the data is present. I can't figure out if it is possible to import a complete uncompressed point cloud, because no compression doesn't appear to be an option. Any suggestions? or is there a way to alter this after it is imported?
    Thanks again,
    Brandy
  • 0 Offline in reply to Brandy Lockhart
    Bentley PODCreator has the option for no compression. Bentley Pointools PODCreator is a Free Download.

  • 0 Offline in reply to fmcallis
    I have tried Bentley PODCreator and it worked very well for small point clouds, the end result was a cloud with no compression that looks great, unfortunately it seems to be having difficulty with larger clouds. When a POD is produced there are usually several tiles in a row which have very low compression while the rest of the cloud looks great. The compressed tiles have less than half the point density of the others. Are my files just to large to be made into uncompressed pod files, or is there a certain file type (I've tried .las and .xyz) that it will work better with this program?
  • 0 Offline in reply to Brandy Lockhart
    PODCreator should be able to handle both LAS and XYZ. How big are your files? Is it possible to share them with us so we can investigate?

    Pascal


     This is a test

  • 0 Offline in reply to Pascal Cloutier
    Thanks for your response Pascal. The xyz files are about 15,300,000 KB, the LAS files are smaller, 11,000,000 KB the number of points is around 336,000,000 per file. Are these files just too large?
  • 0 Offline in reply to Pascal Cloutier

    Hello Pascal, It took a while but we were able to make a las file that I could send you. The only problem is that after compression the files is still close to 3 GB. Is there a way that I can get this to you?

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