1. Department of Survey and Remote Sensing, School of Geosciences and Info-physics, Central South University, Changsha, China
2. Center for Geomatics and Regional Sustainable Development Research, Central South University, Changsha, China
3. College of Surveying & Geo-Informatics, Tongji University, Shanghai, China
4. Department of Civil Engineering, Ryerson University, Toronto, ON, Canada
5. National Centre for Groundwater Research and College of Science and Engineering, Flinders University, Adelaide, SA, Australia