1. School of Physics and TechnologyNanjing Normal University Nanjing People's Republic of China
2. School of Electrical and Automation EngineeringNanjing Normal University Nanjing People's Republic of China
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and ApplicationNanjing Normal University Nanjing People's Republic of China
4. College of Electronic and Information EngineeringNanjing University of Aeronautics and Astronautics Nanjing People's Republic of China
5. School of Electronic and Information EngineeringSouth China University of Technology Guangzhou People's Republic of China