Enhancing Spatial Resolution of GNSS-R Soil Moisture Retrieval through XGBoost Algorithm-Based Downscaling Approach: A Case Study in the Southern United States. - Qidi Luo; Yueji Liang; Yue Guo; Xingyong Liang; Chao Ren 005; Weiting Yue; Binglin Zhu; Xueyu Jiang (Remote. Sens., 2023)