A Road Traffic Management System for Dalian Based on GIS a

This papers aims to establish a road traffic management system for Dalian based on GIS and WebGIS technologies. First, based on the map of Dalian, digital road network database is constructed within GIS, and visualized database management programs are developed to realize a Graphic Use Interface (GUI) style query and maintenance of road and traffic information. Further, in order do network analysis in the database “shortest-path searching” module is developed whose core is Dijsktra shortest-path algorithm. Based on topology structure of road network and the traffic attributes of links, the module allows users to select nodes and display the shortest-path in GIS map window visually. Moreover, here Dynamic-Link Library (DLL) technique of Visual C++ is applied to accelerate Dijstra algorithm without hampering users’ interfaces. Second, attributes and photo databases of traffic accidents are created, which records traffic accidents’ information with the styles of GIS spatial data, generalized data and disc file data and supports access of several kinds of visits. Meantime, an integrated visualized management program is developed to realize queries and maintenances of various accident data. In this research database module integrates generalized and GIS databases, and combination of MapBasic and Visual Basic performs good effectiveness in dealing with spatial data and designing interfaces. Third, WebGIS is used as the platform for remote users and the mentioned models as severs’ applications to display hypertext files and pictures to users through browsers. WebGIS utilizes both IIS package within Windows2000 operating system and MapXtreme to build the map system of online browsing.