1. School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, China
2. School of Artificial Intelligence, Jianghan University, Wuhan, China
3. College of Surveying and Geo-Informatics, North China University of Water Resources and Electric Power, Zhengzhou, China
4. Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden