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. Faculty of Mathematics and Statistics, Ningbo University, Ningbo, China
4. School of Geodesy and Geomatics and the Key Laboratory of Geospace Environment and Geodesy, Ministry of Education and Joint International Research Laboratory of Modern Geodesy and Geodynamics, Ministry of Education, Wuhan University, Wuhan, China
5. Institute of Applied Remote Sensing and Information Technology, Key Laboratory of Agricultural Remote Sensing and Information System, and the Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Natural Resources and Environmental Science, Zhejiang University, Hangzhou, China