The Accessibility Evaluation Of The Shijiazhuang Urban Public Traffic Lines Based On GIS

Into the 21st century, along with sustained economic growth, urbanization, industrialization process has accelerated significantly, the city also will be a sharp increase in traffic demand, traffic problem plagued urban development has become one of the important issues. The traffic problem is a large and complex problem related to the political, economic and other aspects of the elements, so building the smooth and efficient urban transport system has become an important task for the government. The effective way to solve urban traffic congestion is to improve the traffic capacity of road network. But the city space is limited, and getting smaller and smaller; Meanwhile, the transportation system has a lot of factors involved, including the road area, road layout, vehicle ownership, transport facilities, traffic management, if separate from the road or vehicle considerations, are difficult to solve fundamental problems. In addition, energy and environmental issues increasingly become important issues of concern. Advocates "bus priority" is a fast and effective way to reduce pressure on urban roads, an effective way to ease traffic congestion. Great efforts to develop public transport, not only convenient for the masses, but also a good solution to urban traffic congestion contradiction. The so-called "bus priority" refers to urban passenger transport with fast, high-capacity public transport system mainly and other modes of transport supplementary.This paper in connection with the present of Shijiazhuang local public transportation system and the city of Shijiazhuang City's own characteristics, apply the GIS technology to urban public transportation network's accesibility among evaluation,and makes every effort to provide the public transportation information service for the municipal transportation department and the ordinary city peoples. This paper is divided into six parts, the first three parts belong to the theoretical research, the middle two are case studies, the last part for the conclusion.The first part introduced this article's research background, looked over a great deal of related literature, reviewed the application of the accessibility results and the state of play, explained the meaning and methods of this study; The second part introduced the definition of the geographic information system (GIS), functions and applications, focused introduction to ?technology platform-ArcGIS software; The third part had systematically expounded the definition of accessibility, and discussed the factors which affect urban travel accessibility, introduced the common measurement in detail from existing literature. The fourth part introduced Geodatabase geographic data model which in ArcGIS software, reorganized each kind of data which based on Shijiazhuang public transportation lines, from the database structure design, the entities abstract, to the attribute list design as well as the data maintenance and updating and so on, demonstrated a complete GIS public transportation database construction process; After that the article took the Hebei Province Shijiazhuang's public transportation lines as an example study, First, the paper selected four key indicators from the structure of public transportation,which are network Density, the non-straight line coefficient, repeat factor, the site density, and applied geographic information system technology (ArcGIS software), evaluated Shijiazhuang's public transportation network roughly, and in this sketchy understanding, based on the five models of evaluation accessibility in the usual method of calculating for the guide, give full consideration to the importance of time factor, in the paper proposed a new computational method to compute public transportation stands accessibility, which mainly refered to gravity model calculation. For solving the unknown variables, the article introduced the shortest path, by solving the shortest path between sites to achieve the calculation of the shortest bus journey times, and then can be carried on to appraise Shijiazhuang's public transportation network accessibility,which taking the time characteristic as the main evaluation criteria; The last part of the paper is a summary of the research,then make future prospect.This article puts the calculation of public transportation accessibility into GIS environment, makes the transportation accessibility research to overcome the limited to the theoretical research shortcomings. The urban public transportation accessibility research can reflect the city's traffic conditions, provides the basis for the reasonable layout of urban planning and the road network optimization, which is a new attempt of the municipal transportation appraisal.