1. Department of Surveying Engineering, Guangdong University of Technology, Guangzhou 510006, China
2. Key Laboratory for City Cluster Environmental Safety and Green, Development of the Ministry of Education, Guangdong University of Technology, Guangzhou 510006, China
3. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
4. School of Civil and Environmental Engineering, the University of New South Wales (UNSW), Sydney, NSW 2052, Australia
5. Geoscience Australia, Canberra, ACT 2609, Australia