1. College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi, China
2. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, China
3. Department of Social Sciences, Education University of Hong Kong, Hong Kong, Tai Po, China
4. GeoInformatic Unit, Geography Section, School of Humanities, Universiti Sains Malaysia, George, Malaysia
5. Departments of Earth Sciences, the University of Memphis, Memphis, TN, USA