1. Chinese Academic Sciences, Xinjiang Institute of Ecology and Geography, Urumqi 830011, ChinabHenan Polytechnic University, School of Surveying and Land Information Engineering, Jiaozuo 454000, China
2. Chinese Academic Sciences, Xinjiang Institute of Ecology and Geography, Urumqi 830011, China
3. Henan Polytechnic University, School of Surveying and Land Information Engineering, Jiaozuo 454000, China