Night-Time Light Imagery Reveals China's City Activity During the COVID-19 Pandemic Period in Early 2020. - Ranyu Yin; Guojin He; Wei Jiang 004; Yan Peng; Zhaoming Zhang; Moxuan Li; Chengjuan Gong (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2021)