1. School of Computer Science, China University of Geosciences, Hubei, Wuhan, China
2. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Hubei, Wuhan, China
3. School of Remote Sensing and Information Engineering, Wuhan University, Hubei, Wuhan, China
4. School of Geographical Sciences, Northeast Normal University, Jilin, Changchun, China