1. College of Geography and Remote Sensing Sciences, Xinjiang University, Urumqi, China
2. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan, China
3. Xinjiang Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi, China
4. Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ, USA
5. Geodata division, Lantmäteriet, Luleå, Sweden