基金Center for Hydrology, Soil Climatology, and Remote Sensing(HSCaRS), Alabama A&M University, Normal, AL35762,USAContributed by the Agricultural Experiment Station, Alabama A&M University Journal No.593+1 种基金Research supported by NAG5-10721 from the National Aeronautics and Space Administration(NASA), Washington, DC, USAAny use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.