基于路网结构的甘肃省城市服务范围优化研究

Optimization of City Service Scope Based on Land Traffic Network:A Case Study of Gansu Province

城市服务范围是城市地理学中的重要内容,通过ArcGIS矢量数据的空间分析方法求解甘肃省14个地级市(州)与全省各地区之间的路网距离,并计算其经济联系量,划分城市服务范围;在此基础上采用ArcInfo编程技术中的线性规划优化技术对划分后的服务范围进行优化处理,找出城市最优服务区。结果表明:划分的城市服务范围明显按照地形起伏和交通路网的走势分布,受城市经济规模和人口数量的影响;优化后的服务范围相比较之前变化很大,受经济、人口因素的影响极化,地形交通在优化过程中起到了决定性作用,研究结果为区域空间规划提供了借鉴。

Firstly we use GIS software to analyse the distance between 14 prefecture-level cities or states and each grid of Gansu Province by the spatial analysis of vector data.And we calculate the value of economic ties.Then we divide the city service scope.Next we use linear programming optimization technology to optimize the divided city service scope in ArcInfo workstation.In order to identify the best area of city service scope.The results show that the city service scope after optimization change a lot compared with the divided city service scope before optimization and the city administrative divisions before optimization.For example,the greatest change in the service scope is Lanzhou.The smallest change in the service scope is Jiuquan.Other cities’change a little around its administrative center.It provide technical and theoretical support for government departments to make planning of city zone divides.