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I'm trying to develop something in QGIS:

enter image description here

Basically, I want to do that, based on a set of data points like this:

enter image description here

I want to do something like that but in QGIS. The data will be used, eventually, to make prescription maps for agriculture and maybe reports. (Which I'm doing now but with another program).

I've been trying the interpolation methods (it make a raster layer), which are good and scientifically correct, but if I want to make, a report for example, it doesn't look good.

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    I think you need some sort of interpolation algorithm
    – Nikos
    Commented Feb 1 at 12:15
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    What do you mean by "it doesn't look good" ? Raster are basically image and image can definitively look good, There are probably some setting (in symbolizing your raster or when creating it) that you can tweak to get good result
    – J.R
    Commented Feb 1 at 13:16
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Commented Feb 1 at 13:19
  • Yes, of course. Sorry for the short explanation: With looking good I mean looking smoother. (I'm aware of the tool "smooth". But it doesn't give me the result I want). The tool "Contour polygon"that Beni mentioned helped a lot ( I used that one and then zonal statistical to make a mean value in each zone).
    – Matias Z
    Commented Feb 1 at 13:37
  • In this case, I suggest using zonal statistics on your initial points layer. Else your interpolating and then aggregating your interpolations. And if the answer solves your problem, please accept it.
    – Beni
    Commented Feb 1 at 14:00

1 Answer 1

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interpolate your target variable to a raster (e.g. by qgis:idwinterpolation) enter image description here

Symbolize that raster with discrete steps (in german: symbology > einkanalpseudofarbe > interpolation: Diskret) enter image description here

or make contour-polygons of that raster (e.g. by gdal:contour_polygon) enter image description here

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