1. Department of Guangdong Province, Surveying and Mapping Institute Lands and Resource, Guangzhou, China
2. Key Laboratory of Natural Resources Monitoring in Tropical and Subtropical Area of South China, Ministry of Natural Resources, Guangzhou, China
3. Guangdong Science and Technology Collaborative Innovation Center for Natural Resources, Guangzhou, China
4. Beidou Research Institute, Faculty of Engineering, South China Normal University, Foshan, China
5. School of Geography, South China Normal University, Guangzhou, China