Introduction: The city monitoring and alarming networking system is an integrated, multi-functional and comprehensive large-scale monitoring alarm system covering the entire city. Its business scope covers public security, traffic control, fire control, criminal investigation, internal security and other public security categories, including image monitoring and Alarm system (including vehicle-mounted mobile video surveillance terminal system), key location monitoring and alarm system, residential community technology prevention system, GPS and CAS vehicle anti-theft anti-robbery alarm system, road traffic monitoring and bayonet system, electronic patrol management system Independent and co-operative subsystems.
After a large-scale provincial, city and county level construction of alarm and monitoring systems, Safe City has entered the intensive and second phase of the deepening application phase. To further understand the current practical planning of safe cities, the author comprehensively discusses Solution planning content.
Safe City New Generation Project Demand Ping An City (City Monitoring and Alarming Networking System) is an integrated, multi-functional and comprehensive large-scale monitoring and alarm system covering the entire city. Its business scope covers law and order, traffic control, fire control, criminal investigation, and internal security. Public security categories, including image monitoring and alarm systems (including vehicle-mounted mobile video surveillance terminal systems), key location monitoring and alarm systems, residential community technology prevention systems, GPS and CAS vehicle anti-theft anti-robbery alarm systems, road traffic monitoring and cards The independent and cooperative subsystems such as the mouth system and the electronic patrol management system.
To further explore the status quo, the Ping An City project is strictly speaking a large-scale, comprehensive, and functionally complex and powerful security management system. At the same time, it needs to meet the needs of public security management, urban management, traffic management, and emergency command, but also Take into account the needs of video surveillance such as disaster accident warning and safety production monitoring, and also consider the cooperation and integration of alarm and access control systems and the linkage with urban public broadcasting systems. The core of the application of Safe City is to build a complete and secure defense system through the three defenses of air defense, physical defense, and technical defense, and to complete the urban security framework with mutual cooperation among various subsystems.
From now on, the new generation of safe city projects will embark on the direction of intelligent and safe cities. It includes a safe city integrated management information platform, which includes multiple systems such as city video surveillance systems, digital city management systems, disaster management and emergency systems, urban energy monitoring and management systems, and urban ITS intelligent transportation systems, and meteorological and environmental information collection systems. As shown in Figure 1), the data exchange platform between subsystems is used to achieve resource sharing and overall supervision and management. The front-end data of the system will be collected by video surveillance systems, data collectors, etc. and then transmitted to the command and dispatch center. The command and dispatch center management platform will consist of video servers, database servers, storage servers, management servers, alarm servers, dispatch control servers, streaming media servers, web servers, large screen display servers, and other application servers. These architectures and projects will be the initial solution framework for Pingan City to embark on a smart city. The author will separately explain how to do a key plan for the construction of a safe city—video surveillance system solution planning practice.
Video Surveillance System Hardware Planning In the intelligent hardware construction plan for the safe city, for video surveillance, taking into account the actual three-tier video management platform architecture, the main content includes the following aspects.
The front-end coverage point of urban video surveillance is at the front-end monitoring point of Safe City. We can perform standard definition, HD-SDI digital high-definition, network HD camera configuration and PTZ options according to the needs of the environment and the level of detail of the target. Location and application of different ways of planning.
1. Important parts of urban security monitoring sites: Various appropriate camera surveillance sites are set up in key locations in cities, public places, major road sections, urban entrances, and multiple zones for security cases, and high-definition network cameras using optical fiber transmission and network transmission Realize 24-hour real-time monitoring.
2. In-vehicle and individual mobile forensic enforcement system deployment: The use of on-board and individual mobile forensic enforcement systems can be rapidly deployed to the city and its surrounding areas, responding quickly to emergency events, and remotely dispatching and commanding at all levels of command centers to enhance The flexibility and mobility of urban security management.
3. City bayonet: In the city's main city entrance and exit roads, a high-definition intelligent bayonet vehicle intelligent monitoring and recording system is built, and an integrated embedded HD network camera is used for automatic monitoring and data processing of passing vehicles. The system uses detection methods such as license plate recognition, buried coil detection, video detection, and radar speed measurement to record vehicle photographs, features of front passengers and drivers, identification of license plate numbers, and body color.
4. A high-level electronic police system was built at the crossroads of the city's important roads: High-definition electronic police systems were installed at major intersections in the city to conduct automatic monitoring and data processing of urban road traffic. Using overhead sensing and buried induction coil detection, capture and record high-resolution photos and videos of illegal vehicles, and automatically identify the license plate numbers of illegal vehicles.
The front-end platform of the police station's video information is the front-end and third-level platform. It is a video information front-end platform located at the police station. It is the initial integration of video and camera management control. In addition to managing video cameras in its own jurisdiction, it also provides Secondary platform video required. Can access the real time picture of all the video information in the police station area, and record at the same time. In addition, it is also possible to use authorization to access specific videos in the diplomatic circles of the jurisdiction for monitoring and video recording.
County Public Security Bureau video sub-control platform Public security second-level platform is the County Public Security Bureau video sub-control center, with the County Public Security Bureau as the core, to form a complete system organization to govern the video in the district, the county-level public security bureau to monitor important regional key video, And upload the video platform of the municipal public security bureau. The second-level platform can look at the video in the jurisdiction or through the authorization of the public security authority at the next higher level to look at the real-time pictures and videos of specific areas and locations outside the jurisdiction.
Municipal Public Security Bureau Video Surveillance Center Municipal Public Security Bureau Video Surveillance Center is the core of the entire video surveillance in Ping An City. It can achieve the city's video information point access and camera control, including video switching, control and display functions, municipal level public security monitoring The center can collect the second- and third-level video information of the city and can monitor real-time pictures and synchronous videos.
This video surveillance system architecture in the structure can be two ways, one for the distributed acquisition and storage mode, that is, by the police station to build a system platform, responsible for the video front-end lens acquisition, storage integration. The second is the centralized storage mode. That is, the Video Sub-center of the District Public Security Bureau is responsible for the collection and storage of video front-end information, and distributes the collected video to the police station for use.
Video transmission scheme hardware planning Public security video transmission network planning and construction plan System transmission planning included.
Adopting an all-IP video surveillance architecture, which is based on the needs of a three-level video transmission network and the need for video and control-related information transmission;
· The construction of a public security third-level transmission private network can achieve high-definition video transmission using high-bandwidth transmission; the transmission private network must be separated from the public security information network, but can be securely interconnected with the public security information network;
• The police station and the Public Security Bureau's monitoring center access the video surveillance system. Distributed video management is used. The Public Security Bureau conducts unified management of the surveillance and conducts centralized management and command of public security.
Platform software and hardware planning Pingan City video surveillance system platform can achieve centralized management of all videos, to maximize the realization of cross-level regional and cross-sector video surveillance resource sharing and interconnection of mutual control, to ensure the quality of the networked video transmission, to provide a video The unified monitoring and retrieval system for information resources will give full play to the role of video surveillance systems in strengthening social management, enhancing the efficiency of policing, organizing prevention and control, and preventing and combating crimes. The following conditions must be met in the monitoring center platform planning.
1. Build a centralized, unified, safe city video surveillance system. Combining the characteristics of image information construction of all units under the jurisdiction of the city, unified planning, unified design, and unified management are carried out to form a public safety technical system of the three levels of the municipal bureau, the county bureau, and the police station to realize the uploading of the city's image resources. Released, the entire network image resource sharing.
2. Multi-level networked safe city video surveillance system. The monitoring center of the municipal bureau and the county bureau can see all camera images of subordinate surveillance stations of each local police station, various administrative villages under the police station, main streets, and social units, and can control the activity cameras of subordinates' various police stations. Each police station views and controls all camera images of each surveillance room under its jurisdiction. The branch monitoring center can control the camera to which the front-end monitoring point belongs.
3. Platform compatibility. Pingan City's video surveillance system can be compatible with DVRs, DVSs, NVRs, and IPCs of various brands in China and must be compatible with the hardware devices involved.
4. The openness of the platform. The video surveillance system in Ping'an City must be considered to be able to seamlessly connect with existing public security system established platforms in all districts and counties of the whole city. It must be able to achieve agreement with hardware integration and facilitate after-sales service.
5. Multi-level user rights management. Ability to combine multi-level departmental and multi-level user rights management with the organization of the public security organ to provide top-down control and management; higher-level departments can manage and control subordinate departments; support user priority level management and ensure high-level systems Users and leaders at all levels control the priority of the operation of the system in major situations or emergencies.
6. emergency plan. When the alarm occurs, the alarm linkage can be realized through the emergency plan, so that the on-duty personnel of the platform can timely learn the relevant information of the alarm and the on-site dynamics, and can inquire or retrieve the relevant recording data through the alarm information afterwards.
7. digital map. In the Public Security Bureau and the county bureau monitoring center, multi-level and multi-level electronic maps such as police stations and administrative villages can be displayed, which can display the distribution of streets, the area of ​​the police stations, the distribution of police force, the police station of the community, the joint defense, and the location of the public security. Wait. And can click to display the monitoring point image; through the electronic map can be configured to monitor network operations.
8. Smart inspection. It can carry out automatic inspection on the equipments under the jurisdiction of the Municipal Bureau and the county bureau. The staff on duty can check the working status and network status of the system DVR, DVS, various types of servers, workstations, etc. at any time; the system can automatically generate working status and occurrence of each monitoring point on a daily basis. The types and timing of the failures facilitate the competent authorities to fully understand the operation status of the monitoring system, identify problems in the system in time, and realize efficient and intelligent system management and maintenance.
9. Alarm linkage control. When the alarm occurs, the preset camera can be automatically switched, the corresponding monitoring image is switched to the corresponding monitor, and is automatically positioned on the corresponding preset position, and the remote preview group can be switched; and the camera can be arbitrarily selected. Video group preview.
10. Alarm event forwarding function. When there is a serious warning situation in the police station monitoring center, and it is necessary to monitor the command center at the branch office, it can be transferred to the county bureau's monitoring center by adjusting the alarm level. The location of the alarm point is flashed on the electronic map of the county bureau monitoring center, and an alarm point video can be popped up. image.
11. Image storage and backup features. All images can be uniformly recorded in each police station and county sub-control center. IP-SAN planning can be used for centralized storage 24 hours a day, and at the same time, a certain redundancy backup function planning can be performed for the disk array.
12. Centralized download function. In the event of network anomalies or other conditions, the front-end monitoring point video image cannot be uploaded to the monitoring center; after the network recovers, non-real-time centralized downloading can be performed, and the video clips are automatically downloaded from the front-end DVR to effectively solve the network failure, network bandwidth, etc. Caused video recording and monitoring problems.
13. Offline operation function. When the network is abnormal, the system can use the local data startup service to achieve normal work and generate log files. After the network is connected, logs generated by offline work can be automatically uploaded to the data center to ensure system security.
14. Multi-screen linkage function. At the workstations of all levels of monitoring centers, the video images of the front-end monitoring points can be restored to analog signals and output to large-screen television walls, enabling multi-screen linkage of electronic maps, video images, and large-screen video walls.
15. Keyboard control function. In the monitoring center, remote cameras, heads, etc. can be controlled via the keyboard. Such as: PTZ control (up and down, left and right, automatic), camera control (aperture, zoom, focus).
16. Encryption mechanism. It requires the use of encryption mechanisms during data transmission, and tracking and recording of the entire process to prevent eavesdropping, tampering, and other illegal use and ensure the security of system information.
The above plans for the Pingan City Monitoring Center may not completely cover functions and requirements. However, for a monitoring center platform, basic requirements are in place.
The long-term goal of managing and planning the construction of safe cities is to construct an integrated city early-warning system and emergency command system. The realistic goal is to build a comprehensive urban policing management system that integrates comprehensive management of public security, urban traffic management and fire fighting and dispatching. Science and technology innovation drives policing work innovation, integrates policing work with resource integration, and gives full play to the government’s other administrative departments, urban management, and community defense forces to form party committee leaders, government organizations, public security management, police and people linkage, and the whole society The new situation in the comprehensive management of public security, jointly managed, lays the foundation for the further construction of an integrated city early-warning system and emergency command system.
In addition to various hardware plans in the Ping An City project, the management server required by the software part is also a key part of the plan. These software solutions include various monitoring management platforms and streams in addition to operating system, database, and other system software. Media software, monitoring software, intelligent transportation systems, electronic police systems, etc. Pingan City's comprehensive management information public service platform includes multiple systems such as video surveillance systems in cities, digital city management systems, and road traffic, and uses urban-level data exchange platforms to achieve resource sharing. The supervision and command center management platform consists of a database server, a storage server, a management server, an alarm server, a dispatch control server, a streaming media server, a Web server, a display server, and other application servers.
After a large-scale provincial, city and county level construction of alarm and monitoring systems, Safe City has entered the intensive and second phase of the deepening application phase. To further understand the current practical planning of safe cities, the author comprehensively discusses Solution planning content.
Safe City New Generation Project Demand Ping An City (City Monitoring and Alarming Networking System) is an integrated, multi-functional and comprehensive large-scale monitoring and alarm system covering the entire city. Its business scope covers law and order, traffic control, fire control, criminal investigation, and internal security. Public security categories, including image monitoring and alarm systems (including vehicle-mounted mobile video surveillance terminal systems), key location monitoring and alarm systems, residential community technology prevention systems, GPS and CAS vehicle anti-theft anti-robbery alarm systems, road traffic monitoring and cards The independent and cooperative subsystems such as the mouth system and the electronic patrol management system.
To further explore the status quo, the Ping An City project is strictly speaking a large-scale, comprehensive, and functionally complex and powerful security management system. At the same time, it needs to meet the needs of public security management, urban management, traffic management, and emergency command, but also Take into account the needs of video surveillance such as disaster accident warning and safety production monitoring, and also consider the cooperation and integration of alarm and access control systems and the linkage with urban public broadcasting systems. The core of the application of Safe City is to build a complete and secure defense system through the three defenses of air defense, physical defense, and technical defense, and to complete the urban security framework with mutual cooperation among various subsystems.
From now on, the new generation of safe city projects will embark on the direction of intelligent and safe cities. It includes a safe city integrated management information platform, which includes multiple systems such as city video surveillance systems, digital city management systems, disaster management and emergency systems, urban energy monitoring and management systems, and urban ITS intelligent transportation systems, and meteorological and environmental information collection systems. As shown in Figure 1), the data exchange platform between subsystems is used to achieve resource sharing and overall supervision and management. The front-end data of the system will be collected by video surveillance systems, data collectors, etc. and then transmitted to the command and dispatch center. The command and dispatch center management platform will consist of video servers, database servers, storage servers, management servers, alarm servers, dispatch control servers, streaming media servers, web servers, large screen display servers, and other application servers. These architectures and projects will be the initial solution framework for Pingan City to embark on a smart city. The author will separately explain how to do a key plan for the construction of a safe city—video surveillance system solution planning practice.
Video Surveillance System Hardware Planning In the intelligent hardware construction plan for the safe city, for video surveillance, taking into account the actual three-tier video management platform architecture, the main content includes the following aspects.
The front-end coverage point of urban video surveillance is at the front-end monitoring point of Safe City. We can perform standard definition, HD-SDI digital high-definition, network HD camera configuration and PTZ options according to the needs of the environment and the level of detail of the target. Location and application of different ways of planning.
1. Important parts of urban security monitoring sites: Various appropriate camera surveillance sites are set up in key locations in cities, public places, major road sections, urban entrances, and multiple zones for security cases, and high-definition network cameras using optical fiber transmission and network transmission Realize 24-hour real-time monitoring.
2. In-vehicle and individual mobile forensic enforcement system deployment: The use of on-board and individual mobile forensic enforcement systems can be rapidly deployed to the city and its surrounding areas, responding quickly to emergency events, and remotely dispatching and commanding at all levels of command centers to enhance The flexibility and mobility of urban security management.
3. City bayonet: In the city's main city entrance and exit roads, a high-definition intelligent bayonet vehicle intelligent monitoring and recording system is built, and an integrated embedded HD network camera is used for automatic monitoring and data processing of passing vehicles. The system uses detection methods such as license plate recognition, buried coil detection, video detection, and radar speed measurement to record vehicle photographs, features of front passengers and drivers, identification of license plate numbers, and body color.
4. A high-level electronic police system was built at the crossroads of the city's important roads: High-definition electronic police systems were installed at major intersections in the city to conduct automatic monitoring and data processing of urban road traffic. Using overhead sensing and buried induction coil detection, capture and record high-resolution photos and videos of illegal vehicles, and automatically identify the license plate numbers of illegal vehicles.
The front-end platform of the police station's video information is the front-end and third-level platform. It is a video information front-end platform located at the police station. It is the initial integration of video and camera management control. In addition to managing video cameras in its own jurisdiction, it also provides Secondary platform video required. Can access the real time picture of all the video information in the police station area, and record at the same time. In addition, it is also possible to use authorization to access specific videos in the diplomatic circles of the jurisdiction for monitoring and video recording.
County Public Security Bureau video sub-control platform Public security second-level platform is the County Public Security Bureau video sub-control center, with the County Public Security Bureau as the core, to form a complete system organization to govern the video in the district, the county-level public security bureau to monitor important regional key video, And upload the video platform of the municipal public security bureau. The second-level platform can look at the video in the jurisdiction or through the authorization of the public security authority at the next higher level to look at the real-time pictures and videos of specific areas and locations outside the jurisdiction.
Municipal Public Security Bureau Video Surveillance Center Municipal Public Security Bureau Video Surveillance Center is the core of the entire video surveillance in Ping An City. It can achieve the city's video information point access and camera control, including video switching, control and display functions, municipal level public security monitoring The center can collect the second- and third-level video information of the city and can monitor real-time pictures and synchronous videos.
This video surveillance system architecture in the structure can be two ways, one for the distributed acquisition and storage mode, that is, by the police station to build a system platform, responsible for the video front-end lens acquisition, storage integration. The second is the centralized storage mode. That is, the Video Sub-center of the District Public Security Bureau is responsible for the collection and storage of video front-end information, and distributes the collected video to the police station for use.
Video transmission scheme hardware planning Public security video transmission network planning and construction plan System transmission planning included.
Adopting an all-IP video surveillance architecture, which is based on the needs of a three-level video transmission network and the need for video and control-related information transmission;
· The construction of a public security third-level transmission private network can achieve high-definition video transmission using high-bandwidth transmission; the transmission private network must be separated from the public security information network, but can be securely interconnected with the public security information network;
• The police station and the Public Security Bureau's monitoring center access the video surveillance system. Distributed video management is used. The Public Security Bureau conducts unified management of the surveillance and conducts centralized management and command of public security.
Platform software and hardware planning Pingan City video surveillance system platform can achieve centralized management of all videos, to maximize the realization of cross-level regional and cross-sector video surveillance resource sharing and interconnection of mutual control, to ensure the quality of the networked video transmission, to provide a video The unified monitoring and retrieval system for information resources will give full play to the role of video surveillance systems in strengthening social management, enhancing the efficiency of policing, organizing prevention and control, and preventing and combating crimes. The following conditions must be met in the monitoring center platform planning.
1. Build a centralized, unified, safe city video surveillance system. Combining the characteristics of image information construction of all units under the jurisdiction of the city, unified planning, unified design, and unified management are carried out to form a public safety technical system of the three levels of the municipal bureau, the county bureau, and the police station to realize the uploading of the city's image resources. Released, the entire network image resource sharing.
2. Multi-level networked safe city video surveillance system. The monitoring center of the municipal bureau and the county bureau can see all camera images of subordinate surveillance stations of each local police station, various administrative villages under the police station, main streets, and social units, and can control the activity cameras of subordinates' various police stations. Each police station views and controls all camera images of each surveillance room under its jurisdiction. The branch monitoring center can control the camera to which the front-end monitoring point belongs.
3. Platform compatibility. Pingan City's video surveillance system can be compatible with DVRs, DVSs, NVRs, and IPCs of various brands in China and must be compatible with the hardware devices involved.
4. The openness of the platform. The video surveillance system in Ping'an City must be considered to be able to seamlessly connect with existing public security system established platforms in all districts and counties of the whole city. It must be able to achieve agreement with hardware integration and facilitate after-sales service.
5. Multi-level user rights management. Ability to combine multi-level departmental and multi-level user rights management with the organization of the public security organ to provide top-down control and management; higher-level departments can manage and control subordinate departments; support user priority level management and ensure high-level systems Users and leaders at all levels control the priority of the operation of the system in major situations or emergencies.
6. emergency plan. When the alarm occurs, the alarm linkage can be realized through the emergency plan, so that the on-duty personnel of the platform can timely learn the relevant information of the alarm and the on-site dynamics, and can inquire or retrieve the relevant recording data through the alarm information afterwards.
7. digital map. In the Public Security Bureau and the county bureau monitoring center, multi-level and multi-level electronic maps such as police stations and administrative villages can be displayed, which can display the distribution of streets, the area of ​​the police stations, the distribution of police force, the police station of the community, the joint defense, and the location of the public security. Wait. And can click to display the monitoring point image; through the electronic map can be configured to monitor network operations.
8. Smart inspection. It can carry out automatic inspection on the equipments under the jurisdiction of the Municipal Bureau and the county bureau. The staff on duty can check the working status and network status of the system DVR, DVS, various types of servers, workstations, etc. at any time; the system can automatically generate working status and occurrence of each monitoring point on a daily basis. The types and timing of the failures facilitate the competent authorities to fully understand the operation status of the monitoring system, identify problems in the system in time, and realize efficient and intelligent system management and maintenance.
9. Alarm linkage control. When the alarm occurs, the preset camera can be automatically switched, the corresponding monitoring image is switched to the corresponding monitor, and is automatically positioned on the corresponding preset position, and the remote preview group can be switched; and the camera can be arbitrarily selected. Video group preview.
10. Alarm event forwarding function. When there is a serious warning situation in the police station monitoring center, and it is necessary to monitor the command center at the branch office, it can be transferred to the county bureau's monitoring center by adjusting the alarm level. The location of the alarm point is flashed on the electronic map of the county bureau monitoring center, and an alarm point video can be popped up. image.
11. Image storage and backup features. All images can be uniformly recorded in each police station and county sub-control center. IP-SAN planning can be used for centralized storage 24 hours a day, and at the same time, a certain redundancy backup function planning can be performed for the disk array.
12. Centralized download function. In the event of network anomalies or other conditions, the front-end monitoring point video image cannot be uploaded to the monitoring center; after the network recovers, non-real-time centralized downloading can be performed, and the video clips are automatically downloaded from the front-end DVR to effectively solve the network failure, network bandwidth, etc. Caused video recording and monitoring problems.
13. Offline operation function. When the network is abnormal, the system can use the local data startup service to achieve normal work and generate log files. After the network is connected, logs generated by offline work can be automatically uploaded to the data center to ensure system security.
14. Multi-screen linkage function. At the workstations of all levels of monitoring centers, the video images of the front-end monitoring points can be restored to analog signals and output to large-screen television walls, enabling multi-screen linkage of electronic maps, video images, and large-screen video walls.
15. Keyboard control function. In the monitoring center, remote cameras, heads, etc. can be controlled via the keyboard. Such as: PTZ control (up and down, left and right, automatic), camera control (aperture, zoom, focus).
16. Encryption mechanism. It requires the use of encryption mechanisms during data transmission, and tracking and recording of the entire process to prevent eavesdropping, tampering, and other illegal use and ensure the security of system information.
The above plans for the Pingan City Monitoring Center may not completely cover functions and requirements. However, for a monitoring center platform, basic requirements are in place.
The long-term goal of managing and planning the construction of safe cities is to construct an integrated city early-warning system and emergency command system. The realistic goal is to build a comprehensive urban policing management system that integrates comprehensive management of public security, urban traffic management and fire fighting and dispatching. Science and technology innovation drives policing work innovation, integrates policing work with resource integration, and gives full play to the government’s other administrative departments, urban management, and community defense forces to form party committee leaders, government organizations, public security management, police and people linkage, and the whole society The new situation in the comprehensive management of public security, jointly managed, lays the foundation for the further construction of an integrated city early-warning system and emergency command system.
In addition to various hardware plans in the Ping An City project, the management server required by the software part is also a key part of the plan. These software solutions include various monitoring management platforms and streams in addition to operating system, database, and other system software. Media software, monitoring software, intelligent transportation systems, electronic police systems, etc. Pingan City's comprehensive management information public service platform includes multiple systems such as video surveillance systems in cities, digital city management systems, and road traffic, and uses urban-level data exchange platforms to achieve resource sharing. The supervision and command center management platform consists of a database server, a storage server, a management server, an alarm server, a dispatch control server, a streaming media server, a Web server, a display server, and other application servers.
Aluminum Gate is made from good aluminum material by cast,aluminum gate no rusting,so it is easy to maintain and can be used for a very long time,it's good at anti-corrosion,it is widely used in various places, like coastal areas,mountain areas,wet or rainy areas.Aluminum gate has light weight,it's easy to transport and assemble,besides aluminum gate is hard and shock-resistance,so it's much securer.
Aluminum gate is made by aluminum casting,it's easy to design and make artistic effect,so there are much more styles and patterns for selection,like followers,plants,animals,mascots,totems,or other symbolic patterns,besides there are various colors,like black,white,grey,golden,bronze,copper colors,and it is more beautiful and grandeur.
Aluminum Fence,Courtyard Fence,Aluminum Fencing,Aluminum Fence Panels
Kaiping Yihuo Trade Company , http://www.donkeytrade.com