1. a Laboratory of Remote Sensing Information Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences , Ocean University of Qingdao , P.O. Box 9718, Datun Road, Beijing, 100101, China
2. b Ocean Remote Sensing Institute , Ocean University of Qingdao , 5 Yushan Road, Qingdao, 266003, China
3. c CAS/CUHK Joint Laboratory for Geo-Information Science , The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong