1. School of Mathematics, School of Computer Science and Information Engineering, Hefei University of Technology, Hefei, PR China
2. School of Engineering Science, University of Science and Technology of China, Hefei, PR China
3. Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences, State Key Laboratory of Resources and Environment Information System, Beijing
4. Key Laboratory of Quantitative Remote Sensing Information Technology, Academy of Opto-s, Chinese Academy of Sciences, Beijing, PR China
5. North Anhui Science and Technology Innovation Center, Long Kang Farm, Huaiyuan, PR China