Exported DXF boundary doesn't match original source data (ASC)

veddycentveddycent Global Mapper UserPosts: 35
Hi all,

I'm a bit confused by this one.
I have a terrain square (5000m X 5000m, 5m resolution) in ASC format, I export it as a DXF 3D Face, gridded (1024m X 1024m), NO resampleing but the edges don't seem to match the source data.

It looks like the last bit is 4m tall but because the sample spacing is 5m it excludes it. This is a huge problem because it will leave a gap between the hundreds of tiles I have.

Is there anyway to make Global Mapper export this part whilst keeping 1024m gridding and 5m sample spacing?

I have attached an image to help illustrate my point.

GM Version: 19.0.2 (b112717)(1)(64-bit)

Any thoughts are welcome.


Comments

  • bmg_bobbmg_bob Global Mapper Programmer Posts: 1,856
    Hello,

    The dimensions of the data can not be evenly divided into tiles of the size you have specified (tile size of 1025 m x 1025 m would cover your data exactly). What would you choose to have Global Mapper do with the extra? Create additional tiles cropped to the export data bounds (currently an option if you specify the number of rows and columns)? Something else?

    Cheers,
    Bob
  • veddycentveddycent Global Mapper User Posts: 35
    Hi Bob,

    Thanks for the reply.

    It would make sense to make the last tile be the size of what is left so 4m, that way no data is lost on export.

    The reason why I'm doing the tile as 1024 m x 1024 m is because an aerial image of size 4096 px x 4096 px, 25cm resolution fits perfectly on said tile.

    I have just noticed that a polygon in the top right corner is also missing. This is when the elevation data is exported as one piece. I have attached a file with both files

    Kind Regards,
    V
  • bmg_bobbmg_bob Global Mapper Programmer Posts: 1,856
    Hello,

    With regard to the missing polygon, I suggest that you update to the latest release of Global Mapper 19 (or if you like, you can get the latest Global Mapper 19 daily build.) If the problem persists, please send an email containing a detailed description of your work flow (including export options used to create the DXF file) and your data to Blue Marble Support (geohelp@bluemarblegeo.com). 

    With regard to the extra data, you will need to check the option "Crop Right and Bottom Cells to Export Bounds". Although it is under the option for selecting rows and columns, it will be applied when you specify the cell width and height.  That window layout may need a little adjustment to make this more obvious.

    Cheers,
    Bob
  • veddycentveddycent Global Mapper User Posts: 35
    Hi Bob,

    Thanks for the info!

    Latest build and Crop Right and Bottom Cells to Export Bounds worked a treat but the nightly didn't.

    The top right and bottom left corners have missing polygons so I will drop an email with sample files.

    I think you're right about the window layout.

    Regards
    V
  • veddycentveddycent Global Mapper User Posts: 35
    EDIT: After exporting again Crop Right and Bottom Cells to Export Bounds doesn't actually solve the issues. I have reported the issue.

    Thanks

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