The spatial identification of peri-urbanization areas in Wuhan based on multi-source data
With the support of multi-source data,this paper takes Wuhan as the research area,starts with four dimensions of function,structure,level and density,and starts with four charac-teristics of social economy,land use,landscape and population,and uses the Densi-Graph and the gravity model to quantify the spatial scope of the peri-urbanization areas comprehensively.On this basis,the paper analyzes the spatial distribution,land use and landscape pattern of peri-urbanization areas.The results show that:(1)Using the Densi-Graph method to determine the threshold point of nuclear density to define the spatial contours of peri-urbanization areas,and combining with the gravity model method based on the grid scale to identify the spatial agglom-eration centers of peri-urbanization areas,it can effectively solve the problem that the administra-tive statistical constraints of the data do not adequately express the characteristic attributes,and realize multi-dimensional quantitative identification under complex urban and rural scenarios.(2)The peri-urbanization area of Wuhan in 2020 is 1 025.43 km2,accounting for 6.35％of the total urban area,which is developed in a"circle and axis"pattern around the outer edge of the ur-ban core,Wuhu,Zhuankou and other urban sub-centers and Yangluo,Zhucheng,Zhifang and other new city centers.(3)The main land use types in peri-urbanization areas are construction land,cultivated land and water,and the land use constitutes"half city and half township"with a fragmented distribution,and the landscape types are characterized by diversity,heterogeneity and high degree of fragmentation.
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