1. School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, China
2. Research Center of Big Data Technology, Nanhu Laboratory, Jiaxing, China
3. College of Electrical and Information Engineering, Hunan University, Changsha, China
4. School of Information Engineering, Kunming University, Kunming, China
5. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing, China
6. College of Geomatics, Xi'an University of Science and Technology, Xi'an, China