1. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China
2. Research Institute for Land and Space, The Hong Kong Polytechnic University, Hong Kong, China
3. Department of Geography and Resource Management and Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Hong Kong, China
4. Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh, UK