1. School of Computer Science, China University of Geosciences, Wuhan, China
2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, China
3. State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan, China
4. Provincial Key Laboratory of Geo-Information Engineering in Surveying, Mapping and Remote Sensing, Hunan University of Science and Technology, Xiangtan, China