1. KU Leuven (University of Leuven), Department of Earth and Environmental Sciences, Celestijnenlaan 200E, BE-3001 Leuven, Belgium
2. Flemish Institute of Technological Research (VITO), Department of Remote Sensing, Boeretang 200, BE-2400 Mol, Belgium
3. Anhui Institution for Economical Research, Hefei 230001, China