I am trying to generate a map in Qgis which makes it possible to see the temperature of a region during a heatwave. This was a great succes. However, I want to add shades as well, since shades lower the temperature.

Now I have the following map:

enter image description here .

On this map we see a part of a city, with red being warmer and blue beging colder. Tree shades for instance make some parts of a street cooler. As you can see some area's have become very pixel-ish. I would like to smooth this map a bit so that for instance one orange pixel within a group of blue pixels, takes over the value of its neighbour and turn into blue as well.

Does anybody has an idea for this?

  • 2
    have you checked bi-linear, nearest neighbor, modal or cubic re-sampling? r.resamp.interp
    – RutgerH
    Commented Dec 19, 2017 at 15:17

1 Answer 1


After some googling I found the SAGA Gaussian Filter in the qgis toolbox. After filtering the raster, a much smoother raster came out.

  • Where have you found the Gaussian Filter in SAGA?
    – Philipp B.
    Commented Feb 13, 2020 at 10:10
  • 2
    @PhilippB. When you open SAGA you can find in the Tool Libraries: Grid -> Filter -> Gaussian Filter.
    Commented May 13, 2020 at 14:18

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