1. Department of Geomatics Engineering, Changsha University of Science and Technology, Changsha, China
2. College of Electrical and Information Engineering, Hunan University, Changsha, China
3. Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Freiberg, Germany
4. State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China
5. Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University, Guangzhou, China
6. Université Grenoble Alpes, Inria, CNRS, Grenoble INP, Laboratoire Jean Kuntzmann, Grenoble, France
7. Department of Technology of Computers and Communications, University of Extremadura, Cáceres, Spain