1. School of Natural Resources and Surveying, Nanning Normal University, Nanning 530001, China
2. Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning 530001, China
3. Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, Nanning 530001, China
4. School of Geography and Oceanography, Nanning Normal University, Nanning 530001, China
5. Department of Geographical Sciences, Beijing Normal University, Beijing 100000, China