Trulia Crime Maps Bring Big Data to the Masses

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Real estate website Trulia is set to roll out a new feature that will allow users to view crime statistics for 50 metro areas in the US.

The new feature, which is slated for launch in June, is a valuable exercise in large scale data processing. The crime maps are based on data collected from more than 1,000 different sources, aggregated into more than 5 million data points on the maps. Block-by-block crime density from the past 12 months is presented in heatmap form, with the top 5 percent of blocks with the most crime colored dark red, the next 5 to 10 percent in light red, and so on. The maps’ update rate varies from hourly to monthly, based on when each locations’ data is available from the various third-party agencies that work directly with law enforcement.

The crime map feature is made possible largely by Trulia’s December 2010

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