I am having a problem with a contour file I got from a municipality. Two, actually. I was using 3.16 and it would just hang up at 99% and then fail. This happened with both files. I tried it again with 3.18 with one file and got this error. But I had chosen structured line, and was using a no-spaces file path on my local desktop, unlike a previous poster. (See images) TIN parameters screen TIN log screen showing process and error message I have 16GB of RAM on a Windows 10 platform. I can't create a DEM for the life of me, and it's stopped my work entirely. Any ideas?

1 Answer 1


Could you try and use Points for Type? If this fails, could you try to simplify your contour lines using Simplify algorithm?

  • It fails regardless of "Point", "Structured Lines" or "Break Lines". ... If I simplify the contour lines, will I still get an accurate surface?
    – Su Leone
    Commented May 18, 2021 at 20:47
  • Any TIN generation is an approximation. If you smooth the lines it gets less accurate too.
    – Lutra
    Commented May 19, 2021 at 8:34

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