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Anyone know a TIN DEM file format commonly used?

In the context of a TIN DEM generator project, I am searching for a file format to save the TIN generated.

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My suggestion is UGRID: https://github.com/ugrid-conventions/ugrid-conventions

As the format is supported by MDAL (https://github.com/lutraconsulting/MDAL/blob/master/mdal/frmts/mdal_3di.cpp) which means you can visualise your mesh directly in QGIS.

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