Evolution of Spatial Pattern on Hunan Province’s Economic Zones Based on Improved Gravitational Models of Cities
改进了城市引力模型，计算了2002、2007和2010年湖南省14个城市间的引力，基于层次聚类划分经济区并分析其动态演化，为城市引力计算和区域经济发展提供参考。
The paper improves the gravitational models of cities from two aspects ofurban qualityandattraction inertia index.It takes 14 cities in Hunan province as research object and then calculates the attractions among cities in 2002,2007 and 2010 year.After that,it analysis the spatial pattern of economic zones for 14 cities in study area based on layer cluster.The results are shown in the following aspects.(1) In 2002 year,Hunan province can be divided into four economic zones —the Changsha-Zhuzhou-Xiangtan economic zone,round-Dongting lake economic zone, Southern and middle Hunan economic zone andWestern Hunan economic zone .(2) Comparing with 2002 year,it occurs another economic zone—centrifugal economic zonein 2007 and 2010 year.Based on the results,the paper also analysis the dynamic evolution of every economic zone.The results will provide references for calculation of urban attraction and regional economic development between cities.