1. Beidou Research Institute, Faculty of Engineering, South China Normal University, Foshan, China
2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
3. Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou, China
4. Department of Aerospace and Geodesy, Data Science in Earth Observation, Technical University of Munich, Munich, Germany