The application scope of urban public security video surveillance system includes combating crime, public security, social management, and serving people's livelihood. In order to achieve the above functions, it is necessary to record the activities of personnel in the public areas of the city. Considering the economy and practicality, it is unrealistic to build a video surveillance system covering all public areas of the city. It is an inevitable choice to plan and design the front-end points of the urban public safety video surveillance system by prioritizing the key nodes of the urban public space and forming the video surveillance coverage system of the ring grid office.
The urban public space node means that people flow, traffic flow, logistics, and information flow gather here, and thus realize the connection with other areas of the city. According to the characteristics of urban public space nodes and relevant normative standards for video surveillance system construction, the key nodes of urban public space can be divided into four categories: important intersections, important road sections, key units and key places.
Important intersection
Road intersections are traffic flow collection points. Video surveillance at intersections can effectively record and track the trajectory of vehicle pedestrians. The important intersections that need to be deployed for video surveillance are shown in the table below.
The characteristics of the intersection scene are as follows: First, the traffic directions of the import and export lanes cross each other, and the driving directions of the vehicles and pedestrians are diversified; secondly, the traffic flow is in a state of intermittent flow, and the following distance of the vehicle or pedestrian is small, and it is easy to form mutual occlusion. Therefore, video surveillance is arranged at the intersection scene to be able to distinguish the overall characteristics of the vehicle pedestrians and identify their destinations and destinations, that is, to implement scene monitoring.
Important section
Important road sections are defined in terms of road grade, road type, boundary attributes, and surrounding environment, such as urban expressway sections, trunk road sections, bridge tunnel sections, expressway ramps, and administrative district boundary sections. The key sections that need to be deployed for video surveillance are shown in the table below.
The characteristics of the road scene are as follows: First, the driving direction of the vehicle pedestrian is single; second, the following distance of the pedestrian of the vehicle is large. Therefore, video surveillance on the road segment requires that images be captured from the front of the vehicle or pedestrian to identify local features of the vehicle pedestrian, such as the vehicle's license plate number, vehicle type, pedestrian facial features, and the like.
Key unit
The key units refer to units that have a major role in maintaining the normal operation of the society, such as party and government organs, postal units, educational units, and medical units. The collection locations of key units involving public areas are shown in the table below.
The characteristics of key units: First, most units have a higher degree of encirclement, and the entrances and exits are more concentrated; second, the main body of each unit is vehicles and personnel. Therefore, in the key unit scene, video surveillance should be covered to cover the unit entrance and exit area to grasp the passage of vehicle personnel at the entrance and exit.
Key place
Key locations include railway stations, coach terminals, used car trading markets, auto parts cities, gas stations, gas stations, charging stations, urban rail transit stations, parks, stadiums, commercial streets, farmers markets, residential areas, hotels and hotels. , financial trading venues, cultural and religious sites, entertainment venues, etc., as well as city squares such as civic squares, monumental squares, and living squares. The collection locations of key locations involving public areas are shown in the table below.
Characteristics of key venue scenes: First, the degree of enclosure of different places is quite different, such as the residential area of ​​residential areas is usually higher than the city square; second, the entry and exit of different places are also different, such as gas stations, gas stations, The main body of the charging station is a vehicle, and the main body of the park is a person. Therefore, the situation of deploying video surveillance in key locations is more complicated, but the overall principle is to cover the entrances and exits of key places and the areas where people gather.
PPGI / PPGL Coil
PPGI/PPGL(prepainted galvanized steel/prepainted galvalume steel ) is also known as pre-coated steel,color coated steel, coil coated steel, color coated steel, prepainted steel sheet. The PPGI steel coil/sheet made of cold-rolled steel sheet and Galvanized Steel Sheet, subjected to surface pretreatment (degreasing, cleaning, chemical conversion treatment), coated in a continuous manner, and baked and cooled to form a product. Coated steel has light weight, beautiful appearance and good anti-corrosion performance, and can be directly processed.
Color coated steel coil is mainly divided into three parts: construction, household appliances and transportation. Building is generally used to build the roof, wall and door of industrial and commercial buildings such as steel structure workshop, airport,warehouse and freezer. Household appliances are used in the production of refrigerators and large air conditioning systems, freezers, toasters, furniture, etc. Transportation industry is mainly used for oil pan, automobile interior parts, etc.
PPGI is a product made of cold-rolled steel coil and (aluminum) Galvanized Steel Coil after surface chemical treatment, coating (roll coating) or composite organic film (PVC film, etc.), and then baking and curing. This product is produced by the manufacturer in coils on the continuous production line, so it is also called prepainted steel coil. It not only has the properties of high mechanical strength and easy forming of steel materials, but also has good decoration and corrosion resistance of coating materials.
Ppgi Ppgl,PPGI/PPGL Steel,PPGI Coil,PPGI & PPGL Steel Coil
Tianjin Youfa Steel Co., Ltd , https://www.youfametal.com