Study On The Coupling Relationship Between Spatial Form And Land Function Structure Based On Administrative Region

In this paper,DMSP / OLS night light map is used to obtain the scope of Shanghai urban built-up area,and Gaode POI is used to obtain fine-grained land use information.A set of data is extracted from 2005-2020 with an interval of 5 years.According to the theory of urban compactness and urban mixed use,three indexes of urban spatial form are selected to evaluate the model of urban spatial form,including proximity compactness,aggregation compactness and perimeter compactness;land function richness and disorder of land function distribution are selected to evaluate the model of land function structure.According to the experimental results,(1)Shanghai built-up area continued to expand in 2005-20 years.In the first period of05-10,the expansion of Shanghai took the center of Shanghai as the center and spread outward.During this period,the compactness of each city decreased.In the period of 10-15 years and15-20 years,under the guidance of polycentric policy,the external administrative regions developed in an integrated way,and the compactness of each administrative region decreased significantly.(2)The number of land functions in each region continues to increase at the mixed level,and the urban functions that can be undertaken in a single region will increase about 2.67 times in 15 years.Affected by the duration of urban development,the mixed degree of land function in the center of the external administrative region is significantly enhanced after 15 years.(3)There is a high positive correlation between aggregate compactness and mixed land use in Shanghai.Neighborhood compactness is positively correlated with mixed land use,and the correlation is weaker than aggregate compactness.Richardson compactness is negatively correlated with mixed land use at first,but positively correlated 10 years later due to the transformation of urban expansion form.