I've recently spotted a number of maps in the wild using hexagonal binning to visualise data. The Sacramento Bee map of Six Years of Sacramento County Homicides is the first time I've seen it being used with the Google Maps API.
The map shows homicides and assaults with a firearm, or shootings, reported to Sacramento police and sheriff's deputies from 2007 to 2012. Homicides on the map are represented as dots. The hexagons are used to display the number of shootings in defined regions on the map.
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