1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Box 129, Luoyu Road, Wuhan 430079, China
2. Department of Earth Sciences, Ndata School of Climate and Earth Sciences, Malawi University of Science and Technology, P.O. Box 5196, Limbe, Malawi
3. Instituto de Astronomia y Ciencias Planetarias de Atacama, Universidad de Atacama, Copayapu 485, Chile
4. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Box 129, Luoyu Road, Wuhan 430079, China