topic Re: Trying to interpret Kernel Density output in ArcMap Questions

Trying to interpret Kernel Density output

GinoOddone — Tue, 15 Nov 2022 13:45:42 GMT

Hi everyone,

I have done a Kernel density analysis but the results are somewhat confusing. Are these reasonable or am I missing something?

Any assistance or advice is appreciated. See attached for further information.

Re: Trying to interpret Kernel Density output

DanPatterson — Tue, 15 Nov 2022 14:43:46 GMT

Kernel Density (Spatial Analyst)—ArcGIS Pro | Documentation

magnitude per unit area.

Your area is quite large (aka the denomitor in the division)

are the roadkills quite small per unit area?

Re: Trying to interpret Kernel Density output

GinoOddone — Tue, 15 Nov 2022 15:14:14 GMT

At the chance of sounding ignorant I have no idea for sure. I have 249 incidents in a road network. Here is the map. Also would these challenges be resolvable in ArcPro Gis documentation given that I am using ArcMap?

Re: Trying to interpret Kernel Density output

DanPatterson — Tue, 15 Nov 2022 18:38:29 GMT

The tools are the same/similar in their operation between arcmap and Pro.

Zoom into one of your red areas and see how many points fall within a raster cell... probably not many, hence the low density (area is in meters squared I presume)

Re: Trying to interpret Kernel Density output

GinoOddone — Tue, 15 Nov 2022 19:26:25 GMT

The area is in square kms.

Re: Trying to interpret Kernel Density output

DanPatterson — Tue, 15 Nov 2022 22:15:29 GMT

So your output cell size is 1490 sq km? (see your first post)

I would check the inputs and the raster properties. also 10^6 m^2 per km^2

Re: Trying to interpret Kernel Density output

GinoOddone — Sat, 19 Nov 2022 22:59:10 GMT

Is there a guide for how to identify an appropriate output cell size? When doing the optimised hot spot analysis I used a distance band of 70333,51m as one of the parameters. For Raster analysis environments I also notice it does not make any significant difference to the figures.