1. a British National Space Centre, Remote Sensing Applications Development Unit, Monks Wood, Abbots Ripton, Huntingdon , PE17 2LS, Cambridgeshire, U.K.
2. b Department of Plant Sciences, University of Cambridge, Botany School, Downing Street , CB2 3EA, Cambridge, F.R. Germany
3. c GEC-Marconi Research Centre, Earth Observation Applications Group, West Hanningficld Road, Great Baddow , CM2 8HN, Chelmsford, Essex, U.K.
4. d Institute of Terrestrial Ecology, Environmental Information Centre, Monks Wood, Abbots Ripton, Huntingdon , PE17 2LS, Cambridgeshire, U.K
5. e NERC Unit for Thematic Information Systems, Department of Geography, University of Reading, Whiteknights, PO Box 227, Reading , RG6 2AB, Berkshire, U.K.
6. f Department of Geography, University of Cambridge, Downing Place , CB2 3EN, Cambridge, U.K.