1. Wuhan University,School of Remote Sensing and Information Engineering,Wuhan,China
2. Xiangtan University,School of Computer Science & School of Cyberspace Science,Changsha,China
3. China University of Geosciences, Beijing,School of Earth Sciences and Resources,Beijing,China
4. Wuhan University,State Key Laboratory of information Engineering in Surveying, Mapping and Remote Sensing,Wuhan,China