1. a Canada Centre for Remote Sensing , 2464 Sheffield Road, Ottawa, Ontario, Canada
2. b Radialion Laboratory , The University of Michigan , 4072 East Engineering Building, Ann Arbor, Michigan, U.S.A
3. c Mail Stop 924 , NASA—GSFC, Greenbelt, Maryland, |U.S.A
4. d Physics Laboratory , TNO , P.O. Box 96864, The Hague, JG, 2509, The Netherlands
5. e Department of Soil Science and Plant Nutrition , Agricultural University , 3 De Dreijen, Wageningen, BC, 6703, The Netherlands
6. f Institut National dc la Recherche Agronomique, Station de bioclimatologic, STEFCE, Centre de Recherchcs d'Avignon, Domaine Saint-Paul , B.P. 91, Monfavet, F, 84140, France
7. g Centre d'Etude Spatiale des Rayonnements , 9, avenue du Colonel Roche, Toulouse, 31029, France
8. h Instituto di Analisi Ambientale e Telerilevamento Applicati all'Agricoltura (IATA)-CNR , Via Pian dei Giullari, 42, Firenze, I, 50125, Italy