1. Sustainable Agricultural Systems Laboratory, Formerly USDA-ARS, Beltsville, Maryland 20705, United States
2. Hydrology and Remote Sensing Laboratory, USDA-ARS, Beltsville, Maryland 20705, United States
3. Hydrology and Remote Sensing Laboratory, Formerly UDSA-ARS, Beltsville, Maryland 20705, United States
4. Sustainable Agricultural Systems Laboratory, USDA-ARS, Beltsville, Maryland 20705, United States