1. National Center for Scientific Research, Littoral Environment Remote-Sensing Geomatics, Brest, France
2. University of Rennes 2, Beaucouzé, France
3. National Institute for Agronomical Research, Experimental Unit on Grapevine and Wine, Beaucouzé, France
4. National Center for Scientific Research, Littoral Environment Remote-Sensing Geomatics, Rennes, France