1. Institute of Remote Sensing and Geographical Information Systems, School of Earth and Space Sciences, Peking University, Beijing, China
2. Key Laboratory of Geographic Information Science, Ministry of Science, East China Normal University, Shanghai, China
3. National Engineering Research Center of Geographic Information System, China University of Geosciences (Wuhan), Wuhan, China
4. Department of Geography, University of Hong Kong, Hong Kong, China
5. School of Remote Sensing and Information Engineering, State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan, China