江苏省公路交通网络可达性评价研究

Appraisement of Road Transportation Network Accessibility in Jiangsu Province

利用ARCVIEW软件的网络分析模块,以江苏省2005年1∶25万基础地理信息数据中的道路网络数据为基础,采用加权平均时间距离指标,对江苏省县级及以上的65个节点城市的可达性状况进行分析评价,并揭示评价模型本身的内在特点.研究结果表明,江苏省可达性空间格局呈不规则的同心环状分布,可达性中心区位于苏南,越向外围可达性越差,且表现为一定的快速干道指向性;节点的可达性状况不仅受制于路网状况,而且受节点区位的影响,与节点的中心性相关,正是由于这种相关关系,使得可达性空间格局呈现不规则同心环状分布,越向外围可达性越差.

Based on the road transportation network of Jiangsu Spatial Data Infrastructure （2005）, choosing the weighted average time distance index, this paper analyses the spatial structure of major cities＇ accessibility in Jiangsu Province using Network Analyst extension in ARCVIEW. The main conclusions are drawn as follows. The accessibility spatial structure in Jiangsu Province presents a series of irregular concentric circles spatial pattern and trends to high-speed trunk road, the inner accessibility level is better and it goes worse from the center to the periphery. The nodes＇ accessibility level is not only confined by the transportation network, but also influenced by its location. It is correlative with its centricity, and as a result, the accessibility spatial structure presents a series of irregular concentric circles spatial pattern and the accessibility level goes worse from the center to the periphery.