My goal is to use some RTK GPS data from combines or sprayers to generate an interpolated DEM of fields for agricultural purposes. I used QGIS for that. So far I opened the data and did a simple TIN interpolation with the interpolation tool in the raster drop-down. As input, I took the point layer and as the attribute the elevation. Somehow the result always looked like that: interpolation result of the TIN interpolation

Does anyone know why it doesn't work? I did the same steps as in the qgis tutorial about interpolating point data.

here is a part of the sample point attribute table:

enter image description here

  • Is the source point layer CRS defined as a projected or geographic coordinate system?
    – artwork21
    Oct 30, 2017 at 17:52
  • 1
    Would be great to post some rows of xyz values to check a sample data
    – aldo_tapia
    Oct 30, 2017 at 17:54
  • The source Layer is projected in WGS 84, which was the default. Oct 30, 2017 at 18:21
  • And what is also worth mentioning it, the IDW worked perfectly fine but doesn't really fulfil the purpose on elevation data Oct 30, 2017 at 18:23
  • Do you mean from the attribute table of the sample points? @aldo_tapia Oct 30, 2017 at 18:41

1 Answer 1


Alright, I finally got it. I always had projection issues, changing all the projections to UTM finally helped. Thanks for your help.

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