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I am trying to compare DWI frequency over the period of 3 years. I want to create 3 maps, with each one showing where DWI's occurred during 2011, 2012, and 2013. I have the point data for this, but I am unsure on the best way to display it.

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I would recommend using either Kernel Density (Spatial Analyst) or Point Density (Spatial Analyst) to represent the magnitude per unit area in raster format. Once you have the KDE, Reclassify (Spatial Analyst) the raster into useful classes.

Kernel Density

Calculates a magnitude per unit area from point or polyline features using a kernel function to fit a smoothly tapered surface to each point or polyline.

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Point Density

Calculates a magnitude per unit area from point features that fall within a neighborhood around each cell.

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  • Great idea that would look great. I went to do it though and turns out the ArcMap I am using does not have the spatial analyst extension unfortunately. Kind of limits what I can do. – Nicholas Jeter Aug 28 '14 at 14:46
  • You can also accomplish this in the open-source QGIS using the heatmap plugin: docs.qgis.org/2.0/en/docs/user_manual/plugins/… – Aaron Aug 28 '14 at 15:04

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