Global Mapper Pro

3D TIN Mesh

Hi all. I don't normally have much luck in attracting a reply but we'll have another go.

Can anybody advise if it is possible to create a 3D TIN rather than square grids? My clients specifically want a triangle grid. I've been using Virtual Surveyor to do this as they have a very good workflow but I'm sure it can also be done in GM.

Seeking to simply create a triangulated irregular mesh from a DEM.

Many thanks.

Best Answer

  • DerrickW
    Accepted Answer

    You can export out to a TIN using LandXML.


    The example above is just exporting some data from the National Elevation Dataset directly to LandXML. If you're creating your own, you can check the box to "Save TIN" when creating a surface and then export that TIN out to LandXML (Look at the check boxes I have selected).



Answers

  • FYI - I'd recommend keeping your LandXML surfaces under 10mb, ideally under 5mb. CAD doesn't deal with very high resolution surfaces very well.

  • Thankyou Derrick for taking the time to respond. Many thanks.

  • Hi Derrick. Ive tried this with a DEM of my own and the global elevation data and managed to only export a blank file. I must be doing something wrong. Ive done the follwoing,

    1. Open DEM
    2. Create an area feature
    3. Highlight the area feature
    4. Select File>Export>Export Vector/Lidar Format>LandXML file>Selected TIN and Crop to Area Feature

    Ive tried it multiple times and keep getting an empty file.

  • Sorry I never saw this reply before today. Did you get this resolved?


    Any chance you're exporting an area smaller than the source data's sampling grid (allowing 3+ elevation points to fall within the export area)?

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