1. School of Geography and Environment, Liaocheng University, Liaocheng 252059, China
2. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
3. Beijing Goldenwater Information Technology Co., Ltd., Beijing 100101, China
4. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
5. Department of Geography and Environmental Studies, Wollo University, Dessie 1145, Ethiopia