1. Xinjiang Normal University, School of Geography and Tourism, Urumqi, China
2. Chuzhou University, School of Computer and Information Engineering, Chuzhou, China
3. Anhui Normal University, School of Geography and Tourism, Wuhu, China
4. Anhui University, School of Computer Science and Technology, Hefei, China
5. Nanjing University of Information Science and Technology, School of Remote Sensing and Surveying Engineering, Nanjing, China