1. Chinese Academy of Sciences, Institute of Remote Sensing and Digital Earth, Key Laboratory of Digital Earth Sciences, Beijing 100094, ChinabGraduate University of Chinese Academy of Sciences, Beijing 100039, China
2. CSIRO Ecosystem Sciences, PO Box 2111, Alice Springs, Northern Territory 0871, Australia
3. Chinese Academy of Sciences, Institute of Remote Sensing and Digital Earth, Key Laboratory of Digital Earth Sciences, Beijing 100094, China
4. CSIRO Division of Mathematics, Informatics and Statistics, Private Bag 5, Wembley, Western Australia 6913, Australia