A 2013 Chicago Tribune opinion piece quoted a city spokesman as saying that surveillance cameras helped solve 4,500 crimes over four years, but the writer notes that more than a million are estimated to have taken place over that time period — meaning that the cameras’ contribution was 0.05% at best.
CCTV cameras also have the potential of creating unintended effects, good and bad.
The term “viewshed” is used in many of the studies, and refers to the area visible to cameras from their fixed locations.
——————- “Analyzing the Influence of Micro-Level Factors on CCTV Camera Effect” Piza, Eric L.; Caplan, Joel M.; Kennedy, Leslie W, June 2014, Volume 30, Issue 2, pp. Abstract: “Objectives: Despite the popularity of closed circuit television (CCTV), evidence of its crime prevention capabilities is inconclusive.
A 2010 document from the European Forum for Urban Security, “Charter for a Democratic Use of Video-Surveillance,” provides a useful overview of the issues at stake as well as a set of principles and tools to ensure that citizens’ rights are respected with CCTV systems.