1. CESBIO, Université de Toulouse, CNRS/UPS/IRD/CNES/INRAE, 18 Avenue Edouard Belin, Bpi 2801, 31401 Toulouse, France
2. CNRM-Météo-France/CNRS, Université de Toulouse, 42 ave G. Coriolis, 31075 Toulouse, France
3. Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti, 93, 06125 Perugia, Italy
4. Research Institute for Geo-Hydrological Protection, National Research Council, Via Madonna Alta 126, 06128 Perugia, Italy
5. Climate and Environmental Remote Sensing (CLIMERS) Research Group, Department of Geodesy and Geoinformation, TU Wien, 1040 Vienna, Austria