In Yuhang District, Hangzhou, Zhejiang Province, networked surveillance systems like "Tianyan" (Tianwang Monitoring), "Global Eye," and "Solicitors" are widely installed across streets and alleys. Reporters noticed that each camera is equipped with a numbered plate beneath it. This unique identification system serves not only as an "identity card" for the surveillance devices but also as an "alarm coordinate." When citizens report an incident, they can locate the nearest monitoring unit, allowing the 110 command center to pinpoint the exact location and access live video footage, significantly aiding law enforcement.
Recently, the Yuhang Branch of the Hangzhou Public Security Bureau announced that they have completed the registration of all existing networked surveillance cameras, with over 5,000 units now officially operational. The police spent more than 100 yuan per device for this labeling process, with the total construction cost reaching several million dollars. Why did they invest over 500,000 yuan in numbering more than 5,000 cameras?
Fang Guowei, director of the Yuhang Sub-Administration, explained that the district has a population of 890,000 residents and 870,000 registered temporary residents. Many migrant workers and even some locals struggle to provide precise locations when reporting incidents. In emergencies, this lack of clarity can delay police response.
In daily policing, if an alarm caller can quickly locate the nearest surveillance unit and use its "alarm coordinates," officers can immediately determine the exact location and access real-time video. This system, known as the "Sanqing effect," ensures that both the caller and the officer know the location, and the video feed provides a clear view of the situation on the ground.
Based on the principle of proximity and visibility, the Yuhang police adopted a design that combines text and numbers. Each monitoring probe is labeled with three key elements: the type of monitoring, the area, and the serial number. The label is standardized—50 cm long and 38 cm wide. The first line reads “Monitoring Pingyu Yuhang,†followed by the number, and the third line states “Alarm Coordinates.†These labels are placed near the camera or on suitable structures to ensure visibility.
Each number corresponds to a specific geographic location. When the public reports an incident, finding the nearest number plate allows the responding officer to accurately locate the scene and access live video, greatly improving response efficiency.
The "alarm coordinates" system has proven highly effective. Recently, Mr. Wang was involved in a car accident while driving. Both parties were foreigners who couldn’t clearly state the location. Officer Xiao Zhou asked Mr. Wang if there was a nearby camera. He quickly located a monitor labeled “Jen-2013†and the police found the exact location—the entrance of Renhe Street’s Garden Village.
Similarly, Master Hu lost his electric bike on an unknown road in Qiaosi Triangle Village. At the time of the call, he didn’t know the exact location. The officer asked him to find the latest surveillance number, which was “Joe-3352.†Police rushed to the scene and reviewed the live footage, discovering a yellow truck had blocked the road, and the driver moved the electric bike into an alley.
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