1. Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo, China
2. Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, China
3. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing, China
4. Hubei Key Laboratory of Applied Mathematics, Faculty of Mathematics and Statistics, Hubei University, Wuhan, China
5. Key Laboratory of Agricultural Remote Sensing and Information System, Institute of Applied Remote Sensing and Information Technology, Zhejiang University, Hangzhou, China