Jie Xue, USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD, United States, Martha Anderson, USDA ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD, United States, Feng Gao, USDA-Agricultural Research Service Beltsville, Hydrology and Remote Sensing, Beltsville, MD, United States, Liang Sun, Chinese Academy of Agricultural Sciences, Beijing, China and Yun Yang, University of Maryland College Park, ESSIC, College Park, MD, United States