1. Intelligent Equipment Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
2. College of Soil and Water Conservation, Beijing Forestry University, Qinghua East Road, Haidian District, Beijing 100083, China
3. Key Laboratory for Quality Testing of Hardware and Software Products on Agricultural Information, Ministry of Agriculture, Beijing 100097, China
4. College of technology, Yunnan Agricultural University, Kunming 650500, China
5. National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China