基于夜光遥感影像与百度POI数据的中国城市群空间范围识别方法
梁泽, 黄姣, 韦飞黎, 申嘉澍, 李双成

Identifying the spatial range of urban agglomerations in China based on night light remote sensing and POI data
LIANG Ze, HUANG Jiao, WEI Feili, SHEN Jiashu, LI Shuangcheng
图3 2015年前后北京及其周边地区社会经济活动强度变化的空间格局
Fig. 3 Spatial pattern of changes in the intensity of socio-economic activities in Beijing and its surrounding areas around 2015