安徽省夜光时空分布和变化特征分析

Analysis of spatial-temporal distribution and variationcharacteristics of night-time light in Anhui Province

夜间灯光影像能够反映地表夜间灯光亮度,从而在一定程度上反映人类活动强度,长时间序列的夜间灯光数据对于经济发展研究具有重要参考价值。以安徽省为研究区,基于时间序列为2012—2020年的NPP-VIIRS夜光遥感影像,利用GIS空间分析、标准差椭圆和重心迁移轨迹等方法,分析安徽省夜光时空分布和变化特征,并且从时间和空间尺度上研究夜光与GDP的关系。结果表明:安徽省夜光值在时间序列上呈现“先缓慢上升后快速上升”的变化趋势,低光区、中光区和高光区占比不断增加,无光区占比不断减少。安徽省夜光亮度在空间上呈现由中部向南北递减的变化趋势,高光增长区主要分布在皖中地区,低光增长区主要分布在皖北地区,无光区大部分处于皖南地区。安徽省夜光重心均在合肥市,整体呈现向西南方向迁移,且夜光与GDP在时空变化上呈高度正相关。

The night light image can reflect the brightness of the night light on the surface,which also reflects the intensity of human activities to a certain extent,and the long-term series of night light data has important reference value for economic development research.Taking Anhui Province as the research area,this paper analyzes the spatial and temporal distribution and variation characteristics of luminous night light in Anhui Province based on NPP-VIIRS night light remote sensing images with a time series of 2012 to 2020,and uses GIS spatial analysis,standard deviation ellipse and center of gravity migration trajectory to analyze the spatial-temporal distribution and variation characteristics of luminous night light in Anhui Province,and to study the relationship between luminous and GDP from the time and space scale.The results show that the luminous value in Anhui Province shows a trend of“first slowly rising and then rising rapidly”in the time series,and the proportion of low-light area,medium-light area and high-light region is increasing,and the proportion of lightless area is decreasing.The luminous brightness of the night light in Anhui Province showed a decreasing trend from the central to the north and south in space,the high-light growth area was mainly distributed in the central Anhui area,the low-light growth area was mainly distributed in the northern Anhui area,and most of the lightless area was located in the southern Anhui area.The center of gravity of luminous light in Anhui Province is in Hefei City,and the overall migration to the southwest is high,and luminous and GDP are highly positively correlated with the temporal and spatial changes.