以西安市交通网络数据为数据源,利用GIS空间分析技术,选取道路密度、道路服务指数、路网连接度和可达性模型四个指标对西安市交通网络的空间形态、空间分布、距离关系进行多角度分析,并在此基础上,构建了综合评价指标,分析了西安市主城区四级城市道路网络的通达性现状。结果表明:西安市的道路交通网络通达性呈现明显的空间分异,受历史因素、经济政策及自然环境等因素的影响,其通达性空间格局呈现典型的单中心多圈层结构,位于市中心的区域通达性最好,并在北,西,西南,南,东五个方向延展,这五个方向通达性递减幅度较小。研究对西安市交通网络的优化和扩展有一定指导作用,对城市交通网络布局和通达性分析评价进行了一定改进。

This paper attempts to take Xi'an transportation network data as the data source, use a GIS spatial analysis techniques, choose road density, road service index, the road network connectivity and reachability,study the road network system combining with the road and the node of the city of Xi'an, then analyses Xi'an transportation network spatial form, spatial distribution, distance relationship, and on this basis, to build a comprehensive evaluation index, analyze the four level road network accessibility status quo. The results indicate that:1) In terms of road density, the highest areas are the city center and high-tech zones, followed by the eastern suburbs and northern suburbs, which are focused on the future development, the region with the lowest road densities, is located in the northwest and northeast where distribute a large number of rural areas.2) In terms of services index, high value area are add with a few more old industrial zones established after the founding of the Republic.3) In terms of the road network connectivity, High value areas of road density merged to form a single high-value area.4) In terms of the reachability, spatial accessibility presents a single center, descending from the center to the periphery, and time accessibility is affected by high-grade roads significantly The accessibility in the center regional is best, and in the north, west, southwest, south and east,this five direction get a lesser extent of decreasing accessibility. Center regional gathered many high-class road, the road network control action is more prominent. Construction of rapid urban periphery ring road Should be strengthen, which is conducive to the balanced development of urban spatial pattern. For the center regional, the focus is to strengthen the management, using the second-class roads and branch street to divert the traffic flow. Research on Xi'an transport network optimization and expansion have some guidance on the urban traffic network layout and accessibility analysis and evaluation for a certain improvement.