1. Department of Computer Science, Faculty of Science, Hong Kong Baptist University, Hong Kong SAR 999077, China
2. Department of Geography, Faculty of Social Sciences, Hong Kong Baptist University, Hong Kong SAR 999077, China
3. China National Environmental Monitoring Center, Beijing 100012, China
4. Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai 200241, China
5. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
6. School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, Guangdong Province, China
7. Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, Anhui, China