Yun Yang, USDA Beltsville Agricultural Research Center, 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, Christopher Hain, National Integrated Drought Information System, Boulder, CO, United States, Jeffrey D Wood, University of Missouri, Columbia, MO, United States and Lianhong Gu, Oak Ridge National Laboratory, Oak Ridge, TN, United States