David Martini¹, Javier Pacheco Labrador¹, Tarek S. El-Madany¹, Karolina Sakowska², Christiaan van der Tol³, Tommaso Julitta⁴, Khelvi Biriukova⁵, Micol Rossini⁵ and Mirco Migliavacca⁶, (1)Max Planck Institute for Biogeochemistry, Jena, Germany, (2)University of Innsbruck, Innsbruck, Austria, (3)University of Twente, ITC-Faculty of Geo-Information Science and Earth Observation, Enschede, Netherlands, (4)JB Hyperspectral Devices, Dusseldorf, Germany, (5)University of Milano - Bicocca, Department of Earth and Environmental Sciences, Milan, Italy, (6)Max-Planck Institute for Biogeochemistry, Department of Biogeochemical Integration, Jena, Germany