Spatial heterogeneity of the impact of built environment on urban vitality:A case study of the central urban area of Nanjing
Urban vitality largely reflects the quality of life of urban residents and the high-quality level of urban development,and has always been a hot topic in urban geography and urban planning.In the transition period of urban development from incremental extension to stock connotation renewal,accurately identifying the spatial pattern of urban vitality under a people-oriented approach and revealing the spatial heterogeneity of the impact of built environment on it is a key prerequisite for scientifically enhancing urban vitality.Therefore,this paper attempts to take the central urban area of Nanjing as an example,based on geographic big data such as mobile signaling data and Baidu Map POI,and integrating the spatio-temporal attributes of daily activities of citizens as parameters to construct a measurement model of urban vitality,and analyze its spatial characteristics at the urban scale.On this basis,we expand the representation of"5D"built environment elements,construct an urban built environment impact indicator system that includes material space,social space,place space,and flow space elements,and use a multi-scale geographically weighted regression model(MGWR)to explore the spatial heterogeneity of the impact of built environment on urban vitality.These theoretical and empirical analyses provide scientific reference for the fine optimization of human-oriented urban vitality.The main findings are as follows:(1)The urban vitality measurement model based on big data of residents'activities,as well as the MGWR,can better identify the spatial pattern of vitality and reveal the spatial heterogeneity of the impact of built environment on it.(2)Urban vitality has a significant spatial polarization phenomenon,and its universal equilibrium,continuous conductivity and independent autonomy in spatial distribution are poor.(3)There is a correlation between built environment and urban vitality at different spatial scales,with positive and negative directions and varying degrees of strength.(4)The creation of urban vitality should be implemented according to the spatial and temporal scenes of resident activities,and the overall and local spatial relationships should be coordinated to improve the suitability and effectiveness of response strategies.
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