Expert system method of performing crime site analysis
First Claim
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1. An expert system method of analyzing crime site data for determining a base of criminal activity, comprising the steps of:
- locating a plurality of related crime sites on an area map;
converting said plurality of related crime scene location data into signals representing discrete crime sites;
delineating a criminal activity area on the area map in dependence upon spacing between the plurality of crime sites;
establishing an x-y grid having a plurality of grid points within the criminal activity area;
for each grid point, determining a distance to each of the plurality of related crime sites;
for each grid point, determining a first probability value in dependence upon each distance, then combining first probability values to determine a second probability value; and
outputting a signal representing a center of criminal activity in dependence upon second probability values for the criminal activity area.
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Abstract
An expert system method is provided that performs crime site analysis in a criminal activity area to determine a likely center of criminal activity. The method uses distances from related crime sites to determine a probability surface for the entire criminal activity area. A target area having highest values of probability becomes the center of criminal activity. The expert system can be used to access other crime databases such as witness reports to further define the criminals; residence or workplace.
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Citations
10 Claims
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1. An expert system method of analyzing crime site data for determining a base of criminal activity, comprising the steps of:
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locating a plurality of related crime sites on an area map; converting said plurality of related crime scene location data into signals representing discrete crime sites; delineating a criminal activity area on the area map in dependence upon spacing between the plurality of crime sites; establishing an x-y grid having a plurality of grid points within the criminal activity area; for each grid point, determining a distance to each of the plurality of related crime sites; for each grid point, determining a first probability value in dependence upon each distance, then combining first probability values to determine a second probability value; and outputting a signal representing a center of criminal activity in dependence upon second probability values for the criminal activity area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An expert system for analyzing crime site data for determining a base of criminal activity, comprising a computer having a memory for storing intermediate values, a display and a printer and a central processing unit controlled software to provide
means for locating a plurality of related crime sites on an area map presented on the display; -
means for converting a plurality of related crime scene location data into signals representing discrete crime sites; means for delineating a criminal activity area on the area map in dependence upon spacing between the plurality of crime sites; means for establishing an x-y grid having a plurality of grid points within the criminal activity area; for each grid point, means for determining a distance to each of the plurality of related crime sites and means for determining a first probability value in dependence upon each distance and means for combining first probability values to determine a second probability value; and means for outputting, to the display and printer, a signal representing a center of criminal activity in dependence upon second probability values for the criminal activity area.
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Specification