基于GIS的徐州市城乡交通基础设施通达性研究

A STUDY ON ACCESSIBILITY OF TRANSPORTATION INFRASTRUCTURE IN URBAN AND RURAL AREA OF XUZHOU BASED ON GIS

以徐州市城乡交通网络数据为数据源,利用GIS空间分析技术,选取长度—半径维数、分枝维数、距离可达性、时间可达性和可达性系数5个指标对该区交通网络的空间形态、空间分布、距离关系、时间关系等进行多角度分析。结果表明,徐州市城乡交通网络长度—半径维数呈现明显的空间分异,徐州市区及周边地区交通网络密度最大,其次是东部,西北部县域交通网络密度最小,分枝维数和长度—半径维数的空间分布基本一致。区内各节点的时间和距离可达性均随距离徐州市区的增大而增大,通达性高于全区平均水平的节点有徐州市辖区各节点,接近全区平均水平的节点有邳州市、沛县和睢宁县,而丰县和新沂市的通达性水平则低于全区平均通达性水平。

s： In this study, the spatial form, spatial distribution, distance relation and time relation of the traffic network in urban and rural areas of Xuzhou were analyzed with GIS spatial analysis though 5 indices includ- ing length-radius dimension, dendrite-radius dimension, distance accessibility, time accessibility and accessi- bility factor, which are from Xuzhou＇s traffic network data. The results indicate that the length-radius dimen- sion is spatial differentiation significantly; the density of traffic network in Xuzhou urban and surrounding area is the largest, and followed by the eastern counties. The value in the northwest counties is the minimum. The value of length-radius dimension in Xuzhou urban district is 1.49, the one of counties in the east is around 1, while the values of Feng County and Pei County are both less than 1, and the distribution of den- drite-radius dimension basically identical with the length-radius dimension. The time and distance accessibili- ty of each node increases with the distance from Xuzhou urban. The nodes whose accessibility are greater than the average level of the region are Xuzhou urban node （including Quanshan borough, Gulou borough, Yun long borough, Tongshan borough, and Jiawang borough nodes）, the nodes whose accessibility are close to the average level are Pizhou City, Pei County, and Suining node, while the accessibility of Feng County and Xinyi node are lower than the average level. The study of transport accessibility shows that the accessibility of Xuzhou urban and rural area is uneven. Therefore, Local authorities of Xuzhou should give the first priority to improving the balance of regional transport accessibility, especially the Northwestern region in order to promote the balance economic development.