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提出一种基于路网分割应用于区域尺度快速识别城乡边界的方法。该方法利用路网与城市空间格局的强耦合联系,通过城乡斑块地理分割与精度计算确定城市斑块的最优解,识别区域城乡空间。以京津冀为例开展方法验证,分析了区域城乡空间格局、路网特征及城市用地经济效率。结果表明,该方法识别精度较高,可用于低成本、快速、高效的区域城乡空间识别;京津冀城市空间格局呈现“大京津、小河北”的差异性,路网密度特征呈现京、津、石3个显著的高密度区域,二者存在高耦合性;2015年该区域城市用地经济效益总体良好,石家庄、保定、和承德3市综合效率值欠佳,需进一步提高土地利用效率。
This paper presents a method of rapid identification of urban-rural boundaries based on the application of road network segmentation to regional scales. This method makes use of the strong coupling relation between road network and urban spatial pattern, determines the optimal solution of urban plains by geographic segmentation and accuracy calculation of urban and rural plains, and identifies urban and rural space in the region. Taking Beijing, Tianjin and Hebei as example, the method is validated, and the spatial pattern of urban and rural areas, the characteristics of road network and the economic efficiency of urban land use are analyzed. The results show that this method has high recognition accuracy and can be used for spatial and spatial identification of urban and rural areas at low cost, fast and high efficiency. The urban spatial pattern of Beijing, Tianjin and Ji shows the differences of “Dajingjin and Xiaobei”, and the characteristics of road network density Beijing, Tianjin and Shihmen. There is a high coupling between the two. In 2015, the economic benefits of urban land in this area are generally good, and the comprehensive efficiency of Shijiazhuang, Baoding and Chengde 3 cities is not good, so land use needs to be further improved effectiveness.