JIANGSU URBAN ACCESSIBILITY IN TERMS OF LAND TRANSPORT

The evaluations of accessibility generally include network analysis and raster analysis.With the spatial analysis function of ArcGIS and the VB programming language,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,straight-line distance and accessibility data are extracted between each of the 65 cities in Jiangsu Province.Based on the accessibility data,the paper analyzed the accessibility of Jiangsu Province for four study years and discussed the evolution characteristics.The conclusions show: The accessibility between each of urban in Jiangsu Province is improved significantly,and the structure is evolved from spindle type to down payments type,the gap of accessibility continued to narrow,the urban contact each other more strongly.Natural conditions and regional conditions are the factors of the accessibility's improvement.Differences in the development of transport infrastructure,lead to the changes of urban accessibility and regional advantages.