Inversion For Summer Nighttime Economic Total Amount Of Large And Medium-sized Cities In Beijing-Tianjin-Hebei Based On VIIRS Data

The large and medium-sized cities in Beijing,Tianjin and Hebei are the economic regions with the highest degree of development in northern China.The total night-time economic volume of the large and medium-sized cities in Beijing,Tianjin and Hebei occupies a considerable proportion in the national economy.Therefore,the study on the total night-time economic volume of the large and medium-sized cities in Beijing,Tianjin and Hebei has a greater role in promoting the national economic development level.Luminous remote sensing technology has been widely used in other fields,such as the environment,disasters,fisheries,and assessment of major events,with remarkable results.However,so far,no results have been seen in the study of night economics with night light remote sensing data.This paper firstly uses NPP-VIIRS night light remote sensing data to invert the night economic total amount of large and medium-sized cities,and constructs the inversion model of the night economic total amount of large and medium-sized cities in the Beijing-Tianjin-Hebei region based on long-time night light remote sensing images,and clarifies the nighttime economic total amounts of large and medium-sized cities in Beijing-Tianjin-Hebei The temporal and spatial dynamics and influencing factors of economic development.The main contents and conclusions of the research include:(1)NPP-VIIRS night light image denoising processing.Since the VIIRS monthly composite image does not remove transient light sources such as noise,fishing boats,and firelight,the study compares and analyzes the threshold method and mask method commonly used for night light remote sensing images through the comparison of spatial angles,terrain angles,and denoising accuracy.Noise effect.The results show that the mask method based on the VIIRS annual synthetic standard image is better than the threshold method as a whole,and the denoising effect is stable.However,the long-time sequence of night light images based on the same mask has a time error;the threshold method is useful for removing low-threshold noise.Good results,but the selection of the threshold is susceptible to subjective images,and it is easy to mistake low-value lights.(2)Construct a model based on night light images to invert the total economic volume at night.Using the remote sensing image of night lights after denoising by the mask method and the statistical data of the night economic total amount of Shijiazhuang urban area,the inversion model of the night economic total amount of large and medium-sized cities in Beijing-Tianjin-Hebei is constructed.The verification results show that the total amount of night light can be effective The inversion of the economic total amount at night provides a new perspective for studying the development of the total amount economic total amount at night in Beijing-Tianjin-Hebei cities.(3)Analyze the temporal and spatial changes of the night economic total amounts of large and medium-sized cities in Beijing-Tianjin-Hebei.Based on night light remote sensing data statistics,the temporal and spatial change trend of the total amount of night light in large and medium-sized cities in Beijing-Tianjin-Hebei was obtained.The economic total amount at night of each city in Beijing-Tianjin-Hebei was obtained by inversion of the model,and the results proved to be consistent with the actual national conditions.The research is based on NPP-VIIRS night light remote sensing data,combined with the statistical data of night economic total amount,constructs the inversion model of the night economic total amount of large and medium-sized cities in Beijing-Tianjin-Hebei,obtains the night economic total amount data of large and medium-sized cities in Beijing-Tianjin-Hebei,and clarifies the major cities of Beijing-Tianjin-Hebei The temporal and spatial distribution of urban night economic development enriches the basic data for studying night economic development,and lays a certain foundation for studying the night economic development of major cities across the country.