1. School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou, China
2. School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China
3. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China
4. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou, China
5. Lands and Resource Department of Guangdong Province, Surveying and Mapping Institute, Guangzhou, China