GIS支持的县域城镇体系空间结构定量分析--以浙江省临安市为例

以城镇空间相互作用理论为依据,采用平均距离摩擦指数和成本加权距离改进现有的空间相互作用理论模型———引力模型和场强模型,定量分析城镇间的空间联系和组合特征,进而明晰区域城镇体系的空间结构。以浙江省临安市为例,在GIS空间分析功能的支持下对改进的模型进行运算,实现了对非均质情况下城镇体系空间结构的定量分析,计算结果能够反映临安市的城镇体系现状特征与发展趋势。

Quantitative Analysis on the Spatial Structure of Town System in County-Scope Supported by GIS:A Case Study in Lin'an County,Zhejiang Province

Geographically,it is the town spatial interactions that organize the dispersed towns into a structured and spatially related system.Thus,the quantitative study on these spatial interactions is essential to identify the structure of an town system.Based on such,this paper employs new concepts,i.e.the average distance friction index and cost weight distance,to adjust and improve the two theoretical models for spatial interactions,namely the gravity model,and field spread model,so that the real county-scope region could be described more accurately.Taking the advantages of GIS spatial analysis functions,the two improved models are implemented to figure out the magnitude of county-pair gravities and the influential areas of each town respectively in the Lin'an County,Zhejiang Province,helping to generalize the structure of its urban system at last.The results fairly match the status quo of local characteristics of study area,and also facilitate the future regional planning and decision making.