1. College of Information and Management Science, Henan Agricultural University, Zhengzhou 450002, China
2. Institute of Agricultural Equipment, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
3. Key Laboratory of Quantitative Remote Sensing in Agriculture, Ministry of Agriculture, Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China
4. Department of Plant and Soil Sciences, College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY 40546, USA
5. Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China