Research on mixing degree of spatial functions of Meizhou based on street view images and points of interest
Current evaluation indicators for mixing degree of spatial functions in urban blocks mainly focus on land use diversity and are limited to two-dimensional(2D)surface space,and there is a lack of comprehensive evaluation of the mixing degree of functions from a three-dimensional(3D)perspective.This study started from a 3D perspective to obtain the spatial function types and distribution within the 3D urban space through street view images and points of interest(POI).It accurately calculated the diversity,accessibility,and compatibility of spatial functions by combining 3D building data,measured the mixing degree of urban functions,and analyzed spatial characteristics from different scales.The research results indicate that:① Based on street view images and POI data,the mixing degree indicators of 3D urban spatial functions(CMI-3D)are constructed,which reflects 3D space extension and concretization of the traditional mixing degree indicator.② The overall distribution of spatial mixing degree values shows a characteristic of"high in the east and the south but low in the west and the north",with an overall mean of 1.458.The proportion of buildings in the maximum value range(2.951,4)is 10.16%.③ There are local differences in the distribution of the mixing degree of urban spatial functions between the study area and the traditional planning layout of urban functions,mainly concentrated in commercial high-rise buildings and mixed commercial buildings.This provides a new approach for analyzing the functional mix of high-rise buildings represented by commercial entities.The research method in this study has a certain reference value in layout planning of urban functions.
mixing degree of urban functionsstreet view imageurban points of interestbuilding scale