The Spatial Connection Evaluation of Yangtze River Delta with the High-Speed Rail
利用城市首位度、多功能中心指数、重心和CI等方法，基于交通流数据评价高铁对长三角空间联系的影响，发现高铁显著改善了区域联系，但上海节点功能因苏浙直连而减弱，长三角正从单功能向多功能中心转变。
Transportation network system has significant effect in the connection of spatial structure of city circle. This paper which use the method of the urban primacy index,the multi-function centres index,the centre of gravity and CI analyses the spatial connection evaluation of Yangtze River Delta with the High-Speed with the urban integration effect based on the traffic flow by ArcGIS. The results indicated:The connection of Yangtze River Delta has significantly been improved by The High-Speed Rail. There are different influence in cities,Shanghai has been lost the node function because of the direct connection between Jiangsu and Zhengjiang. The decreasing of HHI,the increasing of functional polycentricity index,the center of gravity transfer in Suzhou offset 11 kilometer in the northwest all show that the Yangtze River Delta which has disparity with the Rhine-Ruhr region is in the process of Single-function center to Multifunction Center. The decreasing of CI indicates that the high-speed railway has increasing marginal utility,the construction of new high-speed rail at this stage than improving the existing traffic frequency can be more effective in promoting the integration of the Yangtze River Delta.