Study Of Road Network Processing Technology For City Transportation

The road network data is the basic data to establish municipal transportation management system and GIS-based municipal administration management system. The organization quality of road network data is directly responsible for the quality of municipal transportation management system and municipal administration management system. This paper takes systemic research on city road network modeling, processing and the vision technology on the background of the city geographic information system for transportation. The majority of work is as follows:(1) An in-depth study on road midline calculation algorithm based on road outline was undertaken and produced and some improvement has been present based on the traditional algorithm. The algorithm efficiency is enhanced by reducing the number of vertex of the road midline, and the accuracy of algorithm in processing flexural road is improved by introducing curvilinear segment into road midline. In addition, a definite form is provided to initialize the road outline and road crossing, thus to enhance the automaticity of algorithm.(2) Based on analyzing the problems and insufficiency of the traditional coding method in application of municipal transportation road network, while considering the system development requirement, a coding method based on the geography entity's geographical position is provided. This coding method respects the GB code standard, expresses the geography entity accurate and exclusive, and has good expansibility and versatility.(3) A multilayer compound road model is constructed according to the data from municipal transportation road network, the model constitutes of the object-oriented space data model and the visible traffic element model. With object-oriented method, 0-0 space data model takes each entity in the municipal transportation road network as an object, making the data more organized and easier to manipulate. Visible traffic element model will provide a nicer visual effect and better operability.The municipal transportation road network processing technology discussed in the paper has applied to a road administration management system and a municipal transportation navigation system. It is proved that this municipal transportation road network processing technology has excellent practical value.