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. GeoInformatic Unit, Geography Section, School of Humanities, Universiti Sains Malaysia, Gelugor, Penang, Malaysia
4. Departments of Earth Sciences, The University of Memphis, Memphis, TN, USA