1. a Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
2. b Research Institute for Geo-hydrological Protection, National Research Council, Perugia, Italy
3. c Department of Environment, Ghent University, Ghent, Belgium
4. d Royal Meteorological Institute of Belgium, Brussels, Belgium
5. e Department of Meteorology, University of Reading, Reading, United Kingdom
6. f National Centre for Earth Observation, University of Reading, Reading, United Kingdom
7. g Department of Physics “Augusto Righi,” University of Bologna, Bologna, Italy
8. j Science Applications International Corporation, Greenbelt, Maryland
9. h Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland
10. i Department of Geodesy and Geoinformation, TU Wien, Vienna, Austria