1. Graduate Student, Dept. of Industrial and Systems Engineering, Virginia Tech, 7054 Haycock Rd., Falls Church, VA 22043-2311.
2. Professor, Dept. of Industrial and Systems Engineering, Virginia Tech, 7054 Haycock Rd., Falls Church, VA 22043-2311 (corresponding author).
3. Lab Director, USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD 20705-2350.
4. Assistant Professor, Dept. of Systems Science and Industrial Engineering, Binghamton Univ., 4400 Vestal Pkwy. East, Binghamton, NY 13902-6000.