| It is of great significance to analyze the spatial and temporal evolution characteristics of the output efficiency of construction land.However,many studies are based on statistical data to calculate the output efficiency of construction land,but the statistical data inevitably has the shortcomings of distortion and poor timeliness,which hinders the accurate calculation.So a concise form and rich connotation of the evaluation index of the output efficiency of construction land method is needed.Night light data can intuitively reflect human social and economic activities,and have significant correlation with various social and economic factors.It also has the advantages of timeliness,objectivity and easy access.Based on this,this study attempts to use the night light data to calculate the output efficiency of construction land.On the basis of quantitative analysis of the relationship between the night light index and the output efficiency of construction land,a comprehensive characterization of the output efficiency of construction land is proposed by using the light density index of construction land.And through the methods of nuclear density analysis,exploratory spatial data analysis and standard deviation ellipse,the spatial and temporal evolution characteristics of construction land output efficiency at county scale in China in 2000,2005,2010 and 2015were analyzed.at the same time,this thesis proposes a method to synthesize NPP-VIIRS annual night lighting data.and combined with DMSP/OLS annual night lighting data,long time series night lighting products from 2000 to 2015 are obtained by linear adjustment.Through research,this thesis draws following conclusions:(1)The annual NPP-VIIRS night light data synthesis method proposed in this thesis is scientific the extreme high values and negative values of synthetic annual night light data are eliminated,and TDN keeps continuous changes.Therefore,the DN values of synthesized annual night light data are more realistic,and the fitting ability of economic parameters is stronger.(2)There is a strong correlation between TDN and the output of construction land,so it is scientific to use the Construction land-Light Density Index(CLDI)to reflect the output efficiency of construction land.By comparing the correlation between the output indicators of construction land such as the added value of secondary and tertiary industries,gross domestic product(GDP),urban scale and urban population scale and night lighting brightness,this thesis finds that:The regression coefficients between TDN and secondary and tertiary industries are 0.8693,between TDN and urban scale are 0.8714,between TDN and urban scale are 0.7254,between TDN and urban population are 0.5865.This shows that between TDN and the output of construction land,so it is scientific to use the CLDI to reflect the output efficiency of construction land.(3)In general,China's output efficiency of construction land has been continuously improved,but the overall level is low,and the gap between regions is expanding,the trend converging to middle and low level club.In addition,from the perspective of light density,Hong Kong,Macao and Taiwan regions>East region>Central region>Western region,from the perspective of growth rate,Hong Kong,Macao and Taiwan regions>Western region>Central region>East region,from different stages,the time is later,the average annual growth rate of construction land light density is greater,so the output efficiency of construction land has obvious spatial differentiation and phase characteristics;There is a strong spatial clustering of the output of construction land.Before 2010,the spatial clustering constantly enhanced.However,after 2010,the spatial clustering is weakening,because of the expanding the gap of output efficiency of construction land between counties;The overall spatial pattern of output efficiency of construction land is stable,and showing the characteristics that dynamic changes in steady state,low level output efficiency of construction land in high level counties and high level output efficiency of construction land in low level counties.Among them,HH-type counties are mainly distributed in Hong Kong,Macao and Taiwan regions,eastern regions and some counties in the central and western regions.LL-type counties are mainly distributed in Tibet and on both sides of the 110 ~O E mountain line.HL and LH-type counties are adjacent to LL county and HH-type.at the different times have different local spatial patterns and the number of counties;The center of the output efficiency of construction land is always located in the eastern and southern parts of China,and it shows a trend of moving to the northwest.The northeast-southwest direction is the main direction of the output efficiency of construction land,the main direction and the secondary direction of the output efficiency of construction land has dispersion. |
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