1. College of Engineering, China Agricultural University, Beijing 100083, China
2. Synergistic Innovation Center of Jiangsu Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
3. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China
4. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China