1. USDA-ARS & ORISE,Hydrology and Remote Sensing Lab,Beltsville,MD,USA
2. USDA-ARS,Hydrology and Remote Sensing Lab,Beltsville,MD,USA
3. George Mason University,Center for Spatial Information Science and Systems,Fairfax,VA,USA
4. Nicholas School of the Environment Duke University,Division of Earth and Climate Sciences,Durham,NC,USA