GIS ANALYSISIN
PUBLIC SAFETY
Denise Stuckey GIS Production Manager
The Schneider Corporation
GIS Data
Sites layer Parcels Centerlines Neighborhood boundaries Corporate Limits Police Beats ESZ/ESN boundaries
Types of Analysis with GIS
Hot Spot analysis Incident Mapping Buffering areas for evacuation Sex Offender Registry
Hot Spot Analysis
Definition – areas of concentrated crime
The area has a greater than average number of criminal events or an area where people have a higher than average risk of victimization
Crime Theories
Place Theories Street Theories Neighborhood Theories
Hot Spots - Points
Hot Spots - Linear
Repeat Streets Major thoroughfares face higher
crime risks than side streets Higher concentration of gas stations,
restaurants, convenience stores, and retail businesses
Hot Spots - Linear
Drug Dealers
Hot Spots - Polygons
Gradient maps – imply a continuous gradient of risk within a hot spot.
Incident Mapping
Tracking Crime, accidents, incidents
Buffering Areas
Evacuations
Crime Alert – automated call back system
Evacuations
Chemical Spills Factory Fires
– Plume Modeling
Natural Disasters
Factory Fire
Crime Alert
Amber Alert Suspect in the area
Sex Offender Registries
Megan’s Law Web applications for citizens to find
sex offenders in their communities In-house maps for police to track and
verify location of sex offenders Pierce County, Washington
– 2,100 registered sex offenders and kidnappers
Pierce County, WA
Citizen Website– Able to search ½ mile radius from
specified address to find registered sex offenders
– Output is a map and a detailed list of all sex offenders in the area
Levels of Sex Offenders
Three Levels Level 3 – most like to repeat crime Displays a picture, address and list of
past crimes of the individual
Geographic Map
Sex Offender Report
Sex Offender Registry
Public Use of website– Must be kept current– Police Dept updates map via the internet
Sex Offender Registry
Maps – Updates coming due– Concentrations of sex offenders– Buffer areas where children are known to
be Indiana Law – Sex Offenders cannot live closer
than 1000 feet of a school property– Property line or house?
Sex Offender Registry
Must be absolutely sure the right information is on the website
Must keep it up to date
Conclusion
GIS can help manage Public Safety information
Determine hot spots Determine where concentration of
police forces need to be Determine evacuation routes Access to current Sex Offender
information