1. Department of Surveying Engineering, Guangdong University of Technology, Guangzhou, China
2. Guangdong Shunde Institute of Environmental Sciences Company Ltd., Foshan, China
3. Nonferrous Metals Geological Bureau of Guangdong Province, Guangzhou, China
4. Guangdong Institute of Surveying and Mapping, Guangzhou, China
5. School of Computer Science and Technology, Guangdong University of Technology, Guangzhou, China
6. CCCC Infrastructure Maintenance Group Company Ltd., Beijing, China
7. Guangzhou City Polytechnic, Guangzhou, China
8. School of Surveying and Remote Sensing Information Engineering, Guangdong Polytechnic of Industry and Commerce, Guangzhou, China