Hotspot Mapping, Near Repeat Hotspot Mapping, Near Repeat Analysis, and Risk Terrain Analysis, and Risk Terrain Modeling Modeling Joint Operational Utility Joint Operational Utility Leslie W. Kennedy Joel M. Caplan Eric L. Piza Rutgers, The State University of New Jersey School of Criminal Justice Center for Law & Justice 123 Washington Street Newark, NJ 07102 www.rutgerscps.org www.riskterrainmodeling.com Presentation to UCL Department of Security And Crime Science October 4, 2011
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Hotspot Mapping, Near Repeat Analysis, and Risk Terrain Modeling
Hotspot Mapping, Near Repeat Analysis, and Risk Terrain Modeling. Joint Operational Utility. Leslie W. Kennedy Joel M. Caplan Eric L. Piza Rutgers, The State University of New Jersey School of Criminal Justice Center for Law & Justice 123 Washington Street Newark, NJ 07102 - PowerPoint PPT Presentation
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Hotspot Mapping, Near Repeat Hotspot Mapping, Near Repeat Analysis, and Risk Terrain Analysis, and Risk Terrain
► Violent crimes (aggravated assaults, Violent crimes (aggravated assaults, homicides, robbery, shootings, and weapon homicides, robbery, shootings, and weapon possession)possession)
► Provided by the NJ State Police through the Provided by the NJ State Police through the Regional Operations Intelligence Center. Regional Operations Intelligence Center. ► 52 violent crime incidents from April to August 52 violent crime incidents from April to August 20072007
► 57 violent crime incidents from April to August 57 violent crime incidents from April to August 2008.2008.
► Hotspots: areas Hotspots: areas with high with high concentrations of concentrations of crime. crime.
► Conventional Conventional hotspot mapping: hotspot mapping: uses locations of uses locations of past events to past events to anticipate anticipate locations of locations of future similar future similar events.events.
► If a crime occurs at a location, the If a crime occurs at a location, the chances of a future crime occurring chances of a future crime occurring nearby increasesnearby increases
► Many near repeat incidents over time Many near repeat incidents over time could result in hotspotscould result in hotspots
chance of chance of victimization at victimization at the same place up the same place up to 7 days after an to 7 days after an initial incidentinitial incident
153% greater 153% greater chance of near chance of near repeat occurring repeat occurring within 14 days at within 14 days at 801-900 feet from 801-900 feet from initial incidentinitial incident
► Use knowledge of near repeat Use knowledge of near repeat phenomenon to intervene at certain phenomenon to intervene at certain placesplaces
► Like hotspot mapping, it relies on Like hotspot mapping, it relies on the occurrence of crime before the occurrence of crime before predicting future behaviorpredicting future behavior
► Risk FactorsRisk Factors Gang membersGang members Bus stopsBus stops SchoolsSchools Public housingPublic housing Bars, clubs, Bars, clubs, fast food fast food restaurants, and restaurants, and liquor storesliquor stores
► 38% of all violent crimes in 2008 38% of all violent crimes in 2008 happened at places with risk values happened at places with risk values of 3 or moreof 3 or more 10% of the area of Irvington10% of the area of Irvington
► Hotspot locations did not move from year to year Hotspot locations did not move from year to year because environments stayed criminogenicbecause environments stayed criminogenic
► Violent crimes occur at places with Violent crimes occur at places with higher environmental riskshigher environmental risks Especially if violent crimes already Especially if violent crimes already occurred thereoccurred there
Joint Operational UtilityJoint Operational UtilitySummary:Summary:► Violent crimes occur at places with high Violent crimes occur at places with high
environmental risks environmental risks ► If environmental risks aren’t mitigated, then crimes If environmental risks aren’t mitigated, then crimes
will continue at same places, creating hotspotswill continue at same places, creating hotspots► Unpreventable instigator crimes will attract near Unpreventable instigator crimes will attract near
repeats at places of higher environmental riskrepeats at places of higher environmental risk