Normalized Solar-Induced Fluorescence Responds Earlier Than Vegetation Indices to the 2019 North China Plain Drought. - Yongyuan Gao; Yelu Zeng; Nadezhda N. Voropay; Anne Gobin; Jianxi Huang; Wei Su 003; Xuecao Li; Shuangxi Miao; Zhe Liu 017; Bingbo Gao; Yachang He; Wendi Lu; et al. (IEEE Trans. Geosci. Remote. Sens., 2025)