1. CLS, 11 Rue Hermes, 31520 Ramonville, France
2. Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON N2L 3G1, Canada
3. H2O Geomatics, Kitchener, ON N2L 1S7, Canada
4. Bioceanor, 06560 Nice, France
5. European Space Agency/European Space Research and Technology Centre, 2201 AZ Noordwijk, The Netherlands