1. Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China
2. Key Laboratory of Forestry Remote Sensing and Information System, National Forestry and Grassland Administration, Beijing 100091, China
3. Faculty of Sciences, Beijing University of Technology, Beijing 100124, China
4. Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
5. Environment and Nature Conservation, Chinese Academy of Forestry, Beijing 100091, China