1. Dep. of Biological and Agricultural Engineering; Texas A&M Univ.; College Station TX 77843
2. USDA-ARS; Hydrology and Remote Sensing Lab.; Beltsville MD 20705
3. Earth and Ocean Science; Univ. of South Carolina; Columbia SC 29208
4. Institute of Bio- and Geosciences: Agrosphere (IBG-3); Forschungszentrum Jülich; 52428 Jülich Germany