1. School of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing, China
2. School of Communication and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
3. MNR Key Laboratory for Geo-Environmental Monitoring of Great Bay Area, Shenzhen University, Shenzhen, China
4. Department of Geography and Resource Management, The Chinese University of Hong Kong, Hong Kong
5. Department of Biomedical Engineering, College of Engineering, Boston University, Boston, MA, USA