Research On Database Of Green Railway Alignment Selection Decision Support System(GRASDSS) Based On GIS

Green Railway Alignment Selection,means that solution is obtained to avoid all the environment sensitivity problem at the layout and design stage of railroading item and in the process of railway route selection,nature condition such as landform,geology,hydrology and so on,especially influence of landscape,nature protection area and entironment on railway scheme must be considered.Finally the scheme which affects environment least is selected through integration assessment of the environment influence.Firstly, based on the technology of Geographic Information System and Decision Support System, through Organic Combination of Human Computer Interaction Subsystem,Model Base Subsystem,Knowledge Base Subsystem and Database Subsystem, making use of technology of MapX and choosing Visual Basic.NET as system development tool, depending on SQL Server 2000, Green Railway Alignment Selection Decision Support System (GRASDSS) is set up. Finally, based on graph overlay of GIS and in virtue of strong spatial analysis function of GIS , more scientific and reasonable decision of line scheme is made.Database is an important component of GRASDSS. It is now a hot research area and a good way to improve scientificalness, maneuverability and timeliness of green railway alignment selection decision supporting.In the design of database , database modeling approach E-R(Entitity-Relation) based on relation model is used in the attribute data modeling.The space data is saved in the Map document of MapInfo and the attribute data is saved in Mapinfo document including Tab and Dat document and SQL Sever 2000 database,which realizes the storage, dynamic renewal and various query of the attribute and space data, the exchange visits between the attribute and space data. The design and coding of data refers to the national standard, which makes the database standard and popular.At the end of paper, with the rebuilding railway of XuanCheng to HangZhou as the study background, according to the theory and methods of system engineering and software engineering, and with the technology of GIS and database as its supports, this paper analyzes and studies the data demanded by GRASDSS. Database of GRASDSS is designed so that makes the green railway alignment selection decision supporing more convenient, scientific and practical.