bmg_bob · Global Mapper Programmer


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  • LiDAR point import - return number and total number of return (2 out of 3) - LAS export


    If you don't get a response here, you should try sending a formal support request via the Help->Send Support Request... menu in Global Mapper, or by sending and e-mail containing a description of your workflow and the error message, along with sample data, if possible, to Blue Marble Geographics Support (  Either of these methods will ensure that the support team sees the problem and that you get a timely response.


  • How to combine multiple .mbtiles files into single one ? (purpose is to web upload)


    From that image, it is difficult to be sure, but it appears that you are exporting a large area (most of which is blank) at a high resolution, and exporting a lot of zoom levels.  Here is another approach that should work:
    1. Load one of the layers.
    2. File -> Export -> Export Web Format..., and choose MBTiles
    3. Tiling Options: Set your zoom levels, and other options
    4. MBTiles Options: Remove check next to "Delete Intermediate Tile Files", and choose a Location directory.
    5. Click OK to perform the export
    6. Load the other layer
    7. File -> Export -> Export Web Format..., and choose MBTiles
    8. Tiling Options: Set your zoom levels, and other options
    9. MBTiles Options: Remove check next to "Delete Intermediate Tile Files", and choose the same Location directory as you used above.  You may get a warning about the directory not being empty, but you can ignore it.
    10. Click OK and choose an MBTiles file name that is different from the one you used previously.  After you are done, this one should contain all of the tiles from both layers.
  • Any options to export TIN to LandXML in GM

    Nats said:

    I tried to export the same as  you suggested but i Couldn't  find the option!!! could you pls elaborate  the proceedings of it so that i can check it at my end.

    Hello Nats,

    Try File | Export | Export Vector/Lidar Format..., then choose Land/XML File from the format list.

  • Reproject LiDAR las files


    What version of Global Mapper are you using?  In GM 17.1, the Batch Convert/Reproject command allows for LAS input and output.

    To reproject a single file
    1. Load the file into Global Mapper
    2. On the Projection tab of the Configuration window, choose your target projection definition.
    3. Click OK.  The data in the main view will be reprojected (thought the source data will not be affected).
    4. Export to LAS using File->Export->Export Vector/Lidar...

  • How can I limit the import bounds of a Spatial_DB table?

    You can now use the following parameters to limit the import bounds on the IMPORT_SPATIAL_DB command:
    • LAT_LON_BOUNDS - specifies the bounds to import in latitude/longitude degrees relative to the WGS84 datum. There should be 4 values in a comma-delimited list following the parameter name. The values should be in order of westmost longitude, southernmost latitude, easternmost longitude, northernmost latitude.
    • LAYER_BOUNDS - specifies that the import should use the bounds of the loaded layer(s) with the given filename. For example, to import to the bounds of the file "c:\test.tif", you would use LAYER_BOUNDS="c:\test.tif". Keep in mind that the file must be currently loaded.
    • LAYER_BOUNDS_EXPAND - specifies that the operation should expand the used LAYER_BOUNDS bounding box by some amount. The amount to expand the bounding rectangle by should be specified in the current global projection. For example, if you have a UTM/meters projection active and want to expand the bounds retrieved from the LAYER_BOUNDS parameter by 100 meters on the left and right, and 50 meters on the top and bottom, you could use LAYER_BOUNDS_EXPAND="100.0,50.0". You can also specify a single value to apply to all 4 sides, or supply 4 separate values in the order left,top,right,bottom.
    I have placed new builds with the latest changes at Simply download the appropriate installer and run it to install the latest build.