Institution: | 1. Center of Integrated Geographic Information Analysis, School of Geography and Planning, Sun Yat-sen University, Guangzhou, China;2. Guangdong Ritu Information Systems Co, Ltd., Foshan, Guangdong, China;3. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China;4. Department of Geography, University of Cincinnati, Cincinnati, OH, USA |