If a population field setting other than NONE is used, each item's value determines the number of times to count the point. The kernel function is based on the quadratic kernel function described in Silverman (1986, p. 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. The volume under the surface equals the Population field value for the point, or 1 if NONE is specified. Only a circular neighborhood is possible. The surface value is highest at the location of the point and diminishes with increasing distance from the point, reaching zero at the Search radius distance from the point. Kernel Density calculates the density of point features around each output raster cell.Ĭonceptually, a smoothly curved surface is fitted over each point.
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