Research On Spatio-temporal Changes Of Henan Province GDP Based On NPP/VIIRS Night Light Data

Since the reform and opening up,with the rapid development of my country's economy,the brightness of night lights brought about by human social activities has also achieved great growth.Night light image data can directly reflect the characteristics of human activities to a large extent,so it is widely used in the research of urban economic spatialization and urbanization evaluation.Henan Province is a province with a large population in my country.Due to the influence of various regional policies,topography,and history,there are significant spatial differences in economic development.Aiming at the problems of unbalanced and inadequate economic development in Henan Province,this article first based on the cropped NPP-VIIRS original monthly lighting data of Henan Province,using the averaging method to synthesize it into annual lighting data,and using the light index in the data Regression analysis was carried out with the GDP statistical data of the year,and a spatial model of the output value of the secondary and tertiary industries based on night light data was constructed,and a spatial model of the output value of the primary industry based on land use data was constructed.Then,the two spatialization results are superimposed to obtain the spatial distribution of GDP in Henan Province,and the temporal and spatial dynamic analysis is carried out to study the current situation and change trend of Henan's economic development;finally,the NPP-VIIRS annual lighting data is used to determine the range of urban built-up areas in Henan Province.Extraction,comparative analysis of the temporal and spatial dynamics of Henan Province's GDP and Henan Province's urban built-up areas and the shift of the center of gravity,so as to provide a theoretical basis for Henan Province's economic development policies.The main conclusions are as follows.(1)Based on the corrected NPP/VIIRS night light image data and land use data,a spatial distribution model of Henan Province GDP was established.Use the corrected NPP/VIIRS night light data to model the output value of the second and third industries in Henan Province,and use the land use data to model the output value of the first industry in Henan Province,and then compare the first industry with the second and third industries.The spatial distribution of Henan Province GDP can be obtained by superimposing the spatialization model of the industry.The results show that spatial simulation of the output values of the first,second,and tertiary industries based on night light data and land use data can obtain the GDP spatial density map and GDP spatial density difference map of Henan Province.The R2 value is average in each year.Reached above 0.98;(2)The spatialization of GDP can intuitively reflect the internal spatial differences of Henan's economy.According to the spatial distribution of Henan Province's GDP,the time and space changes of Henan Province's GDP are analyzed,and the time and space changes of Henan Province's GDP are analyzed by studying the characteristics of time change,spatial change characteristics,and change trends.The study found that the GDP of Henan Province has achieved rapid growth,the brightness of lights has increased significantly,and the changes in GDP and night light brightness maintain a high consistency;the GDP spatial density map intuitively reflects the overall economic development of Henan Province is good,but There are big differences in internal space.The cities in the central and northern plains develop faster,and the cities in the western and southern mountainous areas develop slowly.As a whole,a clustered urban pattern with Zhengzhou as the center and expanding outward has been formed.In addition,the economic development pattern of Henan Province presents a cross-shaped city chain,with the Beijing-Guangzhou Railway from the north to the south and the Longhai Railway from the east to the west.The economic development centers of various cities tend to gather in Zhengzhou,the capital of the central province.High-speed economic growth areas are mainly concentrated around the city of Zhengzhou,as well as areas along the railway line,forming a relatively obvious economic development zone.The western and southern mountainous areas are areas where the economy of Henan Province is relatively weak.(3)Use night light data and built-up area statistics data to construct the built-up area extraction threshold of each level city in Henan Province,and extract the built-up area of each level city in Henan Province based on the threshold.According to the previous research results,the spatial and temporal distribution characteristics of Henan Province's GDP spatialization are compared with the spatial and temporal distribution characteristics of Henan's urban built-up area,and the comparative analysis is based on the trend of the relationship between the changes in GDP23 and the built-up area changes obtained in the previous article;Analyze the change trend between the center of mass of the built-up area and the center of density of GDP23,and tentatively analyze the impact of the change of the built-up area on the spatial distribution of GDP.The results show that the temporal and spatial changes between the two have a relatively good correspondence.