Improving Geocoding Rates in Preparation for Crime Data Analysis

Article


Brimicombe, A., Brimicombe, Lily C. and Li, Y. 2007. Improving Geocoding Rates in Preparation for Crime Data Analysis. International Journal of Police Science & Management. 9 (1), pp. 80-92.
AuthorsBrimicombe, A., Brimicombe, Lily C. and Li, Y.
Abstract

The new geocoding toolkit (matching a crime to the geographic location where it occurred) has been developed in order to improve the "hit" rate (rate at which a batch of crimes can be accurately located on a map). The purpose of the toolkit is not to replace commercial address-matching software such as Matchcode or QAS, but to enhance the outcome of the geocoding process by building additional steps and tools around these existing software products. It is a five-stage process. The first stage cleans common errors that arise in the address fields of crime data. In the second stage, the crime data are passed through commercial address-matching software, which attaches geographic coordinates to the crime location based on a street address. All addresses successfully geocoded at this stage are given the validation code "L1," indicating that the crime has been linked to an individual property address at the highest level of accuracy. The third stage focuses on crimes with nonaddress locations. The majority of these are street junctions and can be found in the free-text data field that describes the venue of the crime incident. Other nonaddress locations would include railway stations, bus stations, and prominent landmarks. The junctions are text-mined by searching for key words. In the fourth stage, all remaining records with a valid unit postcode (mail delivery point) are geocoded at the postcode level. The final stage of the toolkit geocodes all remaining records according to street name. A test of this system in a British police force raised the "hit" rate for accurate crime location an additional 65 percent to a rate of 91 percent.

KeywordsAutomated police information systems; Computer mapping; Computer software; Geographic distribution of crime; Foreign police; Automated crime analysis; Geographic information systems; Crime Mapping
JournalInternational Journal of Police Science & Management
Journal citation9 (1), pp. 80-92
ISSN14613557
Year2007
Accepted author manuscript
License
CC BY-ND
Publication dates
Print2007
Publication process dates
Deposited14 Oct 2009
Additional information

Citation:
Brimicombe, A.J., Brimicombe, L.C., Li, Y. (2007) ‘Improving Geocoding Rates in Preparation for Crime Data Analysis’ International Journal of Police Science & Management 9 (1) 80-92.

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