基于POI数据的南京主城区城市功能混合度研究

Research on Urban Functional Mixing Degree in the Central Area of Nanjing based on POI Data

提高城市用地混合使用的程度,建设多样化、多功能的城市空间,是塑造城市活力、促进可持续健康发展的重要方式。以南京主城区为对象,首先指出香农多样性指数在测度功能混合度时存在一定局限性,其次尝试用混合程度和混合质量两个指标来评判地块功能混合度的高低,最后对主城区用地功能混合度进行识别,总结空间分布特征并分析相关影响因素。研究发现:南京主城区的功能混合度总体呈现“中心集聚、多点散布”的高混合度地块空间分布特征,局部呈现中心区片状集聚、沿主要道路线状集聚以及围绕地铁站点状集聚的特征。根据混合度特征分析,宏观层面的影响因素包括城市建设发展时序、商业中心体系规划等,而中微观层面的分布形态则与市场因素、用地布局、地铁站点等密切相关。

To improve the degree of mixed-use of urban land and construct diversified and multifunctional urban space is an important way to shape the vitality of urban and promote sustainable and healthy development.Taking the central area of Nanjing as the object,this study points out that Shannon's Diversity Index has certain limitations in measuring functional mixing degree,then tries to use mixing degree and mixing quality to judge the level of functional mixing degree of plot,and finally identifies the functional mixing degree of the central area,summarizes the spatial distribution characteristics,and analyzes the relevant influencing factors.The results show that the functional mixing degree of the central area of Nanjing presents the spatial distribution characteristics of high mixing degree plots with"central agglomeration and multi-point dispersion"on the whole,and the local features are patchy agglomeration in the central area,linear agglomeration along the main road,and dotted agglomeration around the subway station,According to the analysis of the characteristics of mixing degree,the influencing factors at the macro level include the timing of urban construction and development or the planning of commercial center system,while at the medium and micro level,the distribution pattern is closely related to the nature of market factors,land layout,and subway stations,etc.