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In late 1998, Trilon Technologies LLC, Dialogic Communications Corporation (DCC), and Esri business partner Bradshaw Consulting Services, Inc. (BCS), developed a system that detects gunfire activity and provides information to help police respond more safely and effectively to these incidents. The system was first adopted by the Redwood City Police and the San Mateo County Sheriff's departments in California. The interface to this system, designed by Bradshaw Consulting Services, uses MapObjects 2 GIS and mapping components to locate the source of illegal gunfire.
The interface, called ShotSpotter, displays an aerial photograph of the area overlaid with streets, parcels, and other features. Imagery is used in the MrSID format developed by Esri business partner LizardTech. The MrSID aerial image allows the police to see details of an area.
Prior to dispatching an officer to the scene, a trained dispatcher listens to the recordings of the event and determines what the sound was and if it warrants mobilization of police forces. The system quickly identifies the incident location and generates information on its address, the owner's name, and the telephone number for the nearest address. This information is relayed to officers so that they can effectively pursue suspects and gather information.
The dispatcher can also graphically and interactively select an area surrounding the shot and immediately see a list of all homes and businesses within the area. The system can extract contact information for residents within a defined proximity of an event at the rate of 30,000 names and addresses per minute. Using The Communicator!, the dispatcher can automatically initiate a call to all of the homes and businesses in the area. A recorded voice identifies the call as coming from the police department and asks a series of questions relating to safety of the residents and asking if they need assistance. The homeowner responds to each question by pressing a button on the phone. The response is automatically recorded and a printout is created at the dispatcher's office. This gives police a list of witnesses to interview without wasting time knocking on doors.
The ShotSpotter system relies on a series of six to 10 specially designed acoustic sensors strategically placed in each square mile of a problem area. These sensors, located on rooftops or utility poles, are networked via telephone or radio to a central computer at the dispatch center. The application runs on Windows NT operating system.
Gunshot fire, picked up by the microphones, is transmitted to the server at the dispatch center. The system requires that at least four microphones register the event before it analyzes the recordings. The difference in the time it takes for the sound of gunfire to reach each microphone is used to triangulate the location of the shooter. Sound travels at about 1,000 feet per second, so in a millisecond gunshot sounds will have traveled about one foot. Within 10 seconds of the event, the terminal in the police dispatch office sounds an alarm and shows the location of the shot on a map.
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