The Research On The GIS-based Technologies For Integrated Urban Traffic Information Management

Currently, more and more attention has been paid to the research on the GIS-based technologies for integrated urban traffic information management (IUTIM). Information systems related to such research have started to be designed and developed. It is now in the phase of optimization with further and comprehensive research and integration of the existing systems, which requires in-depth technical research of IUTIM, designing and building system platforms, integrating and uplinking the separate, independently running data and systems, and developing platform-based, hierarchical, layered and unified systems for integrated traffic information management (ITIM). Technical research of the IUTIM systems is a systematic project of great complexities. This dissertation attempts to carry out a scrupulous study, with its main contents and innovations as follows:1. This thesis analyzes the background and status quo of the current research on IUTIM, dissects the concept of ITIM system, and explicitly defines ITEM system and its platform. It also elucidates on the research contents and basic ideas of this dissertation by pointing out the main problems in the current technical research of IUTIM.2. The dissertation analyzes the demands of the data of integrated urban traffic information. It discusses the main principles in system development and puts forward the innovative ideas and methods of developing IUTIM systems in an integrated fashion.It designs the layered architecture, functional and hierarchical structures. It designs the network structure of the system, discusses the makeup and functions of the computer software and hardware systems for the platforms, and designs the interfaces and databases for the system.3. The focus is on the analysis and research of the transit information management (TIM) system and its key technologies. It analyzes the algorithms and realization of transit transfer model (TTM), transit network optimization model (TNOM), and the shortest path model (SPM). In the research of TTM, the dissertation innovatively puts forward two new models: the search-based TTM and the TTM based on directed graph and topological relations. In the research of TNOM, it puts forward an algorithm using the cost model. This model is realized in the TIM system.4. The dissertation discusses the cross river traffic guidance (CRTG) model. Grouping together the multi-dimensional research techniques, it analyzes the fluctuation regularity of the traffic flow as a result of the changes of time, space, and event, and thus infers the basic algorithm of the CRTG model. It innovatively puts forward the algorithm of "three-state judgment" for the realtime status of the urban surface transportation. It then designs the subsystems of information collection and transmission, data analysis and handling, information dissemination and safety maintenance and management for the cross river transportation.5. This dissertation analyzes the demands for the GPS-based transit monitoring and dispatching management system (TMDMS), designs its system structure, network framework, logic structure and database. It puts forward, for the first time, the concept of "unified gateway". Hence, government departments and businesses are able to learn about realtime operation of vehicles and impose realtime monitoring and dispatching management. This dissertation founds and develops the model of unified gateway complete with a communication protocol. It designs ways to translate the model into real practice. The government's regulatory and administrative system, the monitoring and management system of businesses and the public information service supporting system are also drafted.