1. College of Computer and Information Engineering, Henan University, Kaifeng, China
2. Henan Engineering Research Center of Intelligent Technology and Application, Henan University, Kaifeng, China
3. Henan Key Laboratory of Big Data Analysis and Processing, Henan University, Kaifeng, China
4. The Second Surveying and Mapping Institute of Hunan Province, Changsha, China
5. The Key Laboratory of Natural Resources Monitoring and Regulation in Southern Hilly Region, Ministry of Natural Resources of the People’s Republic of China, Changsha, China