1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
3. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
4. Research Unit Cartography, Department of Geodesy and Geoinformation, Vienna University of Technology, Vienna, Austria