1. College of Geoexploration Science and Technology, Jilin University, Changchun, China
2. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
3. CESBIO, Université de Toulouse, UT3-Paul Sabatier/CNES/CNRS/INRAE/IRD, Toulouse, France