基于路网的石羊河流域乡镇空间测度

道路交通的通达性是城市空间相互作用和经济联系的重要前提。本研究利用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通达性定量评价的基础上，采用引力、潜力和场强模型对区域内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，其对区域内其他县、区的辐射强度随交通距离增加和道路通达性降低而不断减小。

Measurement of spatial interaction between counties in Shiyang river basin based on road network

The accessibility of road network plays an important role in the process of spatial interaction among cities. In the present study, the road network accessibility in Shiyang river basin is evaluated by the network analysis and spatial analysis functions of GIS. Then, based on gravity model, potential theory model and field spread model, the spatial interaction level among 5 counties was calculated, and the potential value, and the spread strength were measured. Through this study, we find that the interaction among counties, potential value and spread strength of Liangzhou zone in Shiyang river basin was stronger than that of the other counties/zones.