Global Mapper v25.0

Issue with Auto-Classify Non-Ground Script

KJackson
KJackson
in GM Script Language
Hello,
I have a lidar file in which I am trying to auto-classify the non-ground points. For some reason I am not getting the same result when classifying the lidar file with the script as I would in the Global Mapper application with the same parameters. It appears that there are fewer vegetation points being classified through the script than when ran in the GUI. I have uploaded pictures of the lidar file after running the classification algorithm with the script and in the GUI. Any assistance would be greatly appreciated! The auto-classify script command is as follows. "LIDAR_CLASSIFY FILENAME=%FNAME% TYPE=NONGROUND GRID_BIN_SIZE="-0.4" LIDAR_MIN_HEIGHT="2" LIDAR_PLANE_MAX_ANGLE="5" LIDAR_PLANE_MAX_OFFSET="0.08" LIDAR_TREE_MAX_OFFSET = "0.15""
                                  
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Answers

  • NateDawgg
    NateDawgg Global Mapper User
    Has anyone else discovered different point classification results when auto classifying LiDAR points cloud via Global Mapper scripting when compared to performing the same auto classification with the same settings in the Global Mapper GUI?

    I work with KJackson and we have seen this issue in both Global Mapper v.19 and v.20. We experienced a large discrepancy in the number of points classified as vegetation. The auto classification that was performed in the GUI was more accurate compared to the auto classification that was performed via GM script. The GUI version had a greater number of points classified as vegetation. In the script output, a lot of the points that should have been classified as vegetation remained classified as "1 Unassigned".
  • bmg_bob
    bmg_bob Global Mapper Programmer
    Hello,

    I suggest that you contact Blue Marble Support directly via email (geohelp@bluemarblegeo.com). Please include a copy of your script, the screen capture of your classification options, and your data set. This will help them reproduce the problem and determine the solution. Thanks.

    Cheers,
    Bob
  • NateDawgg
    NateDawgg Global Mapper User
    bmg_bob said:
    Hello,

    I suggest that you contact Blue Marble Support directly via email (geohelp@bluemarblegeo.com). Please include a copy of your script, the screen capture of your classification options, and your data set. This will help them reproduce the problem and determine the solution. Thanks.

    Cheers,
    Bob
    Thanks Bob! We will contact them with the issue.

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