Estimating Gross Primary Productivity (GPP) over Rice-Wheat-Rotation Croplands by Using the Random Forest Model and Eddy Covariance Measurements: Upscaling and Comparison with the MODIS Product. - Zexia Duan; Yuanjian Yang; Shaohui Zhou; Zhiqiu Gao; Lian Zong; Sihui Fan; Jian Yin 017 (Remote. Sens., 2021)