1. College of Geography and Environment, Shandong Normal University, Jinan 250014, China
2. College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
3. School of Geospatial Engineering and Science, Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
4. Key Laboratory of Comprehensive Observation of Polar Environment (Sun Yat-sen University), Ministry of Education, Zhuhai 519082, China