Abstract:

The evaluations of accessibility generally include network analysis,grid analysis and raster analysis.With the spatial analysis function of ArcGIS,by the method of grid analysis,to regard the 65 administrative center of counties or cities in Jiangsu Province as the nodes,under the help of traffic network data of Jiangsu Province in the year of 1990,1996,2002 and 2008,the paper analyzed the accessibility of Jiangsu Province for four study years and discussed the influencing factors of the evolution of spatial structure.The conclusions show:①The accessibility of Jiangsu Province has been significantly improved.The average value of accessibility improves up to 428%.②The accessibility has improved quite different among northJiangsu,middleJiangsu and southJiangsu.The accessibility of southJangsu is improved better than northJangsu. Throughout the study period,the accessibility of middleJangsu is improved behind the southernJangsu and northern Jangsu.③Overall,the regional average accessibility was gradually moving towards to balance,and the traffic structure of Jiangsu Province was going to consummate step by step.④By analyzing the correlation between the construction of highway network and the accessibility,the conclusion can be put forward that the effect of traffic construction is applicable to the principle of diminishing marginal utility.Increase traffic investment in backward areas contributes to the achievement of the regional benefit.⑤The accessibility evolution in Jiangsu Province reflects the demand for urban development