1. Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China
2. Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing, China
3. School of Information Science and Technology, Beijing Forestry University, Beijing, China
4. Global Environmental Modelling and Earth Observation (GEMEO), Department of Geography, Swansea University, Swansea, UK