1. State Key Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
2. Department of Geosciences, University of Arkansas, Fayetteville, AR, USA
3. School of Computer Science and Engineering, Wuhan Institute of Technology, Wuhan, China
4. Institute of Photogrammetry and Remote Sensing at Chinese Academy of Surveying and Mapping, Beijing, China