Research on the expansion of Beijing-Tianjin-Hebei China's capital metropolitan agglomeration based on night lighting technology

Abstract

With the development of cities, it is an inevitable trend for cities to spread and expand to peripheral areas. Accurate measurement of urban boundaries and scope, so as to be able to obtain accurate results and laws of urban area expansion and the evolution characteristics of urban forms, is of great significance to the sustainable development of urban science. This paper attempts to use the method of yearly calibration, taking Beijing-Tianjin-Hebei China's capital economic circle as an example, to calibrate and sort out the multivariate and long-term night light remote sensing data of DMSP and VIIRS from 1992 to 2020, so that it can be applied to long-term evolution analysis and analysis and research. In addition, this paper also uses this data set to analyze the evolution pattern of urban expansion in the region, and finds that cities in the Beijing-Tianjin-Hebei region mainly develop to the east and south, and the development is most obvious in the coastal areas. Urban sprawl in the region is accompanied by accelerated land area growth, low population growth, and low density increases.