GIS支持下石羊河流域路网空间测度分析

GIS-based analysis of spatial measure of road network in Shiyang River basin

道路交通通达性是城市空间相互作用和经济联系的重要前提.利用ArcGIS的网络分析和空间分析功能,在对石羊河流域公路交通网络可达性定量评价的基础上,采用引力、潜力和场强模型对7个县(区)的空间相互作用程度、城市潜力值和城市的辐射场强进行定量测度和比较分析.研究发现:凉州区对区域内城市作用力最强,城市对外相互作用潜力大、辐射带动作用强度高.区域整体上形成了以金川区、凉州区为中心的辐射中心,对区域内其他县(区)的辐射强度随交通距离增加和道路通达性降低而不断的减小.

The accessibility of the road network is an important premise of spatial interaction and economic connection among cities.By employing the functions of network analysis and space analysis of ArcGIS and on the basis of quantitative evaluation of the accessibility of highway traffic network in Shiyang River basin,the spatial interaction degree,urban potential value,and urban spreading field intensity in seven counties （districts） were quantitatively measured,compared and analyzed with attraction model,potential model,and field intensity model.It was found by investigation that the urban interaction,potential value,and spread-driving action of Liangzhou district in Shiyang River basin was either the strongest or stronger than in other districts.In the basin as a whole,a spreading center was formed at Jinchuan and Liangzhou districts and its spreading intensity decreased gradually with the increase of traffic distance and the decrease of road accessibility.