HI everyone, I have a dataset of contour lines and elevation points and I want to create a TIN model from these dataset. In a first moment the software crashed. So I checked the geometry of the shapefile with the "Geometry check" and some lines were duplicate. After eliminating the duplicate geometries, the interpolation starts but it stops at 22%. I changed the computer machine and I tried also a old qgis version 2.18 and I had the same problem.
I made other tests: I noted that the shapefiles contain the z and m values (POINTZM and LineZM) I saved the dataset (export - save features as) without the z-coordinates (see Figure) and the tin interpolation crashed again. [image: image.png] Finally I remove the z and m values with the tool "Drop Z/M Value" in the processing tools. In this way the interpolator works. I don't understand because if I remove the z and m values with the "Drop Z/M values" tools, the interpolator works and if I eliminate the value from the export the interpolaor doesn't work. (Is not the same thing?) Moreover, is it possible that the problem is the z and m values? I think that the z-values is stored specifically for the interpolation tools or am I wrong? Finally, I want know if is this the right strategies or there are other problems in the dataset, which are somehow resolved by the "Drop Z/M valus" tools? Does anyone have any ideas or had the same problems? Thanks, in advance for any tips Maria
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