1. Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, FL, USA
2. State Key Laboratory of Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
3. Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL, USA
4. School of Computer Science and Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China