I currently have a grid of values (concentration in ug/m^3) for a certain pollutant. I then converted each grid to a point to use as an input to the Kernel density analysis tool in ArcGIS pro.

The map seems correct; however, I am not quite understanding the values of this output as seen in the figure below. It does not match the range of my data. enter image description here

The maximum (from the original data was 34 ug/m^3). The data range is from 0 to 34 ug/m^3.

The settings I used are the following:

enter image description here

Hoping you guys could help out :) Thanks!

  • Do the same with population field None. Divide yours by output . Result is average within radius. – FelixIP Mar 2 '20 at 18:26

You appear to have not set the search radius so the tool has defaulted to a radius as specified here.

The help file provides details of how the tool works. To me the key statement is "The density at each output raster cell is calculated by adding the values of all the kernel surfaces where they overlay the raster cell center."

  • Thanks, it does make sense now. So am I right in thinking that, within that radius, the tool takes something like a weighted average? hence why values are lowered as in my explanation above.? – alberto_gar Mar 2 '20 at 20:53

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