I created the slope layer in QGIS through "Raster > Analysis > Slope" and then used the function in GRASS r.slope.aspect, but how do I highlight a slope of 0° degrees to 60° degrees? I tried the input through the raster calculator 0 < slope < 60 but I obtain a completely black raster without any units.

  • 2
    Change the display colour for that range of angles in the layer styling panel?
    – wingnut
    May 14, 2021 at 8:44

1 Answer 1


Unless your terrain is very/extremely(?) mountainous you are not going to have many slopes > 60 degrees, so maybe almost all your slopes are 0-60?


  1. Slope
  2. Raster calculator on your slope. I calculate slopes <=30 to 1. Steeper slopes gets value 0.
  3. Style the output using "Paletted/Unique values and add only the value 1:

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