1. a Hydrological Sciences Branch and Microwave Sensors Branch, Space and Earth Sciences Directorate, NASA/Goddard Space Flight Center , Greenbelt, Maryland, 20771, U.S.A
2. b Science Systems and Applications , 7375 Executive Place, Seabrook, Maryland, 20706, U.S.A
3. c Centel Federal Services Corporation , 11400 Commerce Park Drive, Reston, Virginia, 22090, U.S.A