1. School of Information Science and Technology, Beijing Forestry University, Beijing 100083, China
2. Key Laboratory of Quantitative Remote Sensing in Agriculture of Ministry of Agriculture and Rural Affairs, Information Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
3. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
4. Forestry Information Research Institute, Beijing Forestry University, Beijing 100083, China
5. Academy of Forestry Inventory and Planning, Beijing 100714, China