New York City Police Department

New York City Crime Map Statistical and Technical Notes

The crime data used in the map is reported seven major felony crime as defined by the NYS penal Law as of the date a computerized crime complaint record is created. The data is updated on a monthly basis for both the year to date accumulation and the previous year accumulation. The crime data is preliminary and subject to change as a result of investigative follow up and may not match earlier published statistics.

The seven major Felony Crimes are; Murder and Non-Negligent Manslaughter, Rape, Robbery, Felonious Assault, Burglary, Grand Larceny and Grand Larceny Motor Vehicle. Attempted crimes are recorded as that crime with the exception of Attempted Murder which is recorded as a Felonious Assault.

Crime data is aggregated to either intersections or street segments depending on how the crime was recorded on the complaint report.

Approximately 97% of all complaint reports can be assigned an intersection or a specific address. If a complaint report cannot be referenced to an intersection or a specific address it is not mapped.

Statistics shown by precinct include all incidents, both unmapped and mapped incidents.

The New York State Penal Law crimes displayed include all the seven major felony crimes reported to the New York City Police Department including crimes recorded by the Port Authority and other police agencies operating within New York City. Federal crimes are not included.

Crime within the Transit System is recorded at the station the train is moving toward if occurring on a train in motion, otherwise at the station of occurrence. This will generally translate to intersections on the map.

Crimes occurring in parks, beaches or open areas often cannot be mapped, some may be mapped if there is enough information on the report to determine a close cross street and will appear on streets or intersections bordering the area. Some larger parks are bisected by streets and crimes recorded as occurring on those streets will be mapped.

The Central Park Precinct encompasses all of Central Park. The 2010 Census lists Central Park with a resident population of 25. The Central Park Conservancy estimates that there are 40 million visitors to the park each year. The crime rate per 1000 resident population statistics for Central Park are therefore not presented.

Crimes occurring on Rikers Island are recorded in the 41st precinct since arrests are adjudicated in the Bronx Courts. Police response is however the responsibility of the 114th Precinct because that command has physical access to the Island. Precinct map boundaries therefore display Rikers Island as part of the 114th Precinct.

The scaling of the graduated symbols and heat maps produced by the Google Map display process will change as the user moves or uses the zoom function within the map window.

2010 census statistics from the New York City Department of City Planning aggregated by Police Precinct are used to calculate the rate per 1000 population.

Heat maps are produced within the Google mapping application additional technical description of the process is available at

https://developers.google.com/maps/documentation/javascript/reference#HeatmapLayerOptions

The Precinct boundary layer is provided by the NYPD all other map layers and specific location labeling is provided by Google Maps.

Both crime counts and crime rates should be interpreted carefully when dealing with central business districts in each borough. These areas, particularly in Manhattan have daytime populations that increase disproportionately during the day compared to the area's resident population, resulting in both high crime counts and high crime rates per 1000 population. The following links contain information that may be of interest:

https://www.census.gov/hhes/commuting/data/daytimepop.html

http://wagner.nyu.edu/files/rudincenter/dynamic_pop_manhattan.pdf

http://www.nycgo.com/articles/nyc-statistics-page

http://www.centralparknyc.org/volunteer/greeter-programs.html