Design And Build For Gas Pipeline Map And Information Management System Base On GIS Technology

Underground pipes are important basic establishment of a city. Its'saftety running is the guarantee of modem city's efficiency and high quality running. It is one of substances of social existence and development, making a role of energy provision and ransmission. As city gas utilization and gas pipeline network scale in cities expand continuously, the manual modes and measures of management can not satisfy the demands of safe gas utilization and high quality service for gas enterprises, the ability and efficiency to treat an emergency will not meet the necessity of urban construct at high speed. The gas supply enterprises need a set of effective and convenient methods to manage the gas supply network, which is valuable underground resource in cities. Establishing gas supply network integrated with management and decision analysis system will promote production control to a new stage, and lay the stable groundwork for standardization of enterprises.First, based on analysis of development background, domestic and foreign present state and perspectives of gas supply network and GIS, the thesis points out some critical technologies for building gas supply network based on GIS: COM technology, oriented object technology, database technology and modeling technology.Second, the paper emphatically explaines the conception, components and sorts of GIS which are base software platform of city gas supply network information system, the meanings and development technology of GIS component base on COM are introduced, and it put forward functions of some important GIS component packaged in CITYGIS platform. The detailed requirements analysis report combined with specific demands of gas enterprises are brought forward based on sufficient survey. According to software engineering principles, combined with critical technologies, the gas supply network system is designed from some aspects below: application program framework, system functions, data organization and database.Then, the technical course of building gas supply network model is introduced, According to the topological relation of gas supply network model for the valves turns-off analysis in course of tube-bursting accidents, the valves turns-off scheme and the area of gas supply network cut-off are established by using the breadth-first search algorithm. Finally, the paper brought forward how to adopt advanced GIS technology to raise utilization ratio of gas resource and management level of urban gas supply enterprises. For supply gas enterprises to utilize the existing city gas resource in good time, rationally and effectively, for accelerating the urban construction and economy development, it had general practical significance. Test run of DAZONG GAS supply network system indicates that the development has achieved scheduled target and established a solid basis for subsequent development and further research.