Users can also go to that address to use a software tool known as an API, or application program interface, to access the geocoded crime-by-crime data, 594,000 crimes in all.
The data provide details for the seven most serious crimes as defined by the FBI: four violent crimes - murder, rape, robbery, aggravated assault - and three property crimes - burglary, theft, and auto theft.
Viewers can see crime by day, time, and block. The data for robberies and assault indicate whether a gun was involved.
For privacy reasons, victim information is not provided.
Ramsey noted the data reflect the initial response by police and do not include subsequent work by detectives. Still, he said, "Some information is better than no information. That's why we're trying to push it out as quickly as possible."
Adel Ebeid, the city's chief innovation officer, said the public release would permit people to use raw data to judge for themselves the performance of city government.
Mark Headd, Philadelphia's chief data officer, said the maps with crime data would soon be overlaid with other data from city departments, such as housing information, to show an ever-richer picture of life in Philadelphia.
On Wednesday night, Headd was scheduled to speak at a tech gathering to brief programmers on the newly available police data.
Grant Ervin, the city official in charge of computerized mapping for the Police and Fire Departments, helped supervise the project.
He said he hoped outside programmers would use the data in unexpected ways.
"Show how me something I don't know and I can apply it - and we can make the city a better place," Ervin said. "That's what I'm hoping for."
The release is a more sophisticated version of data police have previously made available though a private website, reachable via http://phillypolice.com/about/crime-statistics.
Philadelphia is among a growing number of cities, including Baltimore and Chicago, that have made this type of crime information public.
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