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The slick Trulia Crime Maps [trulia.com] aims to give the masses the opportunity to understand what is "really" happening in their local neighborhood. The interactive geolocated heatmap visualizes where crimes happen most, what types of crimes those are, and when they actually happened. In addition, locals and passers-by have the opportunity to comment and discuss what is 'actually' going on in their environment through the online interface.

The map is now available for over 50 metro areas, and includes more than 5 million data points aggregated from more than 1,000 different sources. Neighborhood blocks are colored according to crime density: the top 5 percent of blocks with the most crimes are colored dark red, the next 5 to 10 percent in light red, and so on.

According to GigaOm, this mapping feature was made possible because of the recent acquisition of geo-data aggregation startup Movity by Trulia.

On crimes, see also:
. San Francisco Crime Spotting
. Mapping Homicides in New York City
. London Police Statistics Sculpture
. U.S. Neighborhood Heat Maps
. and the very first: Oakland Crime Spotting.

On Trulia, see also:
. Mapping the Average Time, Amount and Likelihood US Houses Drop in Price
. Trulia Snapshot
. Trulia Hindsight
. Trulia Hindsight Historical Usage.



Plotting raw crime stats is horribly misleading. You essentially just end up with a population density/activity map. All crimes need a denominator, and each crime needs a specific one. Burglaries should be reported per household. Car thefts per parked-auto hour. Assaults per person hour.

As it is all they've got is fail.

Mon 06 Jun 2011 at 11:20 AM

I understand your point, AP, but I beg to differ. I agree that it MAY tend toward a population density map, but in some instances it may not. Where I live there is a lot of gang activity in an area that is not densely populated. It does a great job of showing this anomaly.

Sat 11 Jun 2011 at 11:55 AM
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