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