Spatial distribution of urban vitality and its correlations with land use:A case study of central urban area in Chongqing,a mega mountain city
Urban vitality represents a significant driving force for the high-quality development of cities,and optimizing urban land use is crucial for enhancing urban vitality.In this study,the urban vitality of the central city of Chongqing is characterized by Baidu population thermal data,multi-source big data including points of interest,building and road vector data,nighttime light,and socioeconomic data are collected,and hot spot analysis,ordinary least squares(OLS)regression,and geographically weighted regression(GWR)models are applied to investigate the correlations between urban vitality and land use function,land use intensities,and land use mixtures.The findings reveal:1)As a typical mega-mountainous city,the urban vitality of central urban of Chongqing shows a spatial pattern of high concentration in the center of the inner ring and the centers of outer secondary clusters,and lower in the peripheral areas,showing significant spatial heterogeneity.2)In terms of the functional types of land use,the inner ring and the population agglomeration area demonstrate a notable enhancement in urban vitality due to the aggregation of facilities in various functional types.Conversely,in the peripheral areas,the performance is less pronounced.3)With regard to land use intensity,an increase in the density of the road network and infrastructure positively impacts the overall vitality.However,the building density exerts a dual influence on vitality,either promoting or inhibiting it,depending on the location.4)In the dimension of land use mixing,a higher degree of functional mixing is observed to have a positive effect on vitality in the centers of clusters,but not in peripheral areas.In order to optimize the spatial pattern of vitality in mega-mountainous cities,it is necessary to improve land use efficiency and to guide the functional layout of the city scientifically.Furthermore,the articulation of land functions between clusters should be strengthened,differentiated land use strategies for each cluster should be constructed,and the mountainous terrain be taken into account to create a residential environment that harmonizes with the mountainous features.
urban vitalityland usemulti-source big datageographically weighted regressionspatial heterogeneity
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