1. School of Science, Engineering and Environment, University of Salford, Manchester, U.K.
2. Earth Observation, Climate and Optical Group, National Physical Laboratory, Teddington, U.K.
3. National Ecological Observatory Network, Battelle, Boulder, CO, USA
4. Department of Bioclimatology, University of Göttingen, Göttingen, Germany
5. UniSystems, Milan, Italy
6. European Commission Joint Research Centre, Ispra, Italy
7. School of Geography and Environmental Science, University of Southampton, Southampton, Highfield, U.K.