[1] Ctr. Applic. Rech. en Teledetection, Univ. de Sherbrooke, Sherbrooke, 2500 Blvd. de l'Université, Sherbrooke, Que. J1K 2R1, Canada
[2] Office of Research and Applications, Natl. Oceanic/Atmosph. Admin., Natl. Environ. Satellite, Data/I.S., 5200 Auth Road, Camp Springs, MD 20746, United States
[3] NASA Goddard Space Flight Center, Code 923, Greenbelt, MD 20746, United States
[4] Atmospheric Environment Service, 4905 Dufferin Street, Downsview, Ont. M3H 5T4, Canada