基于GIS的南通市公路交通网络可达性研究

Road Transportation Network's Accessibility in Nantong City Based on GIS

利用GIS网络分析扩展模块,并基于加权平均出行时间指标,对南通市公路交通网络的区内、区外可达性进行分析.结果表明:南通市内部可达性呈现中部沿江地区高、两端地区低的不规则圈层分布,可达性中心出现在市区并向通州区方向延伸,与中心城市的空间发展方向一致,节点的可达性与其经济区位密切相关,区内可达性受高速干线公路影响甚微;在区外可达性方面,苏通大桥与崇启大桥建成通车后,南通市内各节点与上海、苏州及无锡三市的加权平均出行时间缩短到2 h以内,尤其是启东市,区外可达性减少了0.79 h,区外可达性空间格局呈现出以市区、通州区及海门市为中心的南部地区较高,北部地区较低的分布特点.

Using GIS network analysis extension module and based on the weighted average travel time index , the accessibility of highway traffic networks in Nantong both inside and outside was analyzed .The results showed that the internal accessibility in Nantong presented some irregular circle distribution ,the accessibility of central region along the Yangtze river was high and both ends of the region was low .Accessibility center appeared in the city center and extend-ed towards Tongzhou district , being consistent with the space development direction of the city center , accessibility of nodes was closely related with its economic location while that of inside area was little effected by the highway .For out-side accessibility , after the Sutong bridge and Chongqi bridge were built , the weighted average travel time was short-ened to 2 hours from each Nantong internal node to three cities such as Shanghai , Suzhou and Wuxi , especially in Qi-dong, accessibility of outside area reduced 0.79 hours.The spatial pattern of outside accessibility was characterized by the fact that accessibility of southern region centered by downtown area , Tongzhou and Haimen is high while that of northern region is low .