I'm trying to calculate relative relief from a raster in QGIS and I have troubles with square kilometer's cirle radius in r.neighbor.

In ArcMap it's done with Focal statistics - circular - map units (564) - range which is almost the same as r.neighbor.

Difference is I can't find a way to make 1 square kilometer radius in r-neighbor.

How do I make this happen?

So, problem with square kilometer is solved. Did anybody work with r.neighbor and knows how to apply equation for square kilometer in r.neighbor?

1 Answer 1


The area of your circle (1km2) is $\PI R^2$ so you need a radius of $\sqrt(1/\PI)$ to make a circle with a 1 km2 area.

  • Thank you for the equation! But now I'm confused, in which part of r.neighbor should i use this equation because the goal is to find maximum and minimum elevation for every square kilometer in raster. I've tried what seems to be best options, after that I tried every option but no luck. Commented Oct 22, 2020 at 11:27
  • I have no idea how r.neighbor works - you asked how to set the radius of a circle with an area of 1km2. This sounds like you have an X Y Problem
    – Ian Turton
    Commented Oct 22, 2020 at 13:06
  • Then I'm sorry, I guees I have to work on my way of asking questions properly. Nevertheless, thank you for this! Commented Oct 22, 2020 at 13:27

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