1. The College of Geography and Environmental Science, Henan University, Kaifeng 475001, China
2. Key Laboratory of Geospatial Technology for Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China
3. School of Geographical Sciences, Northeast Normal University, Changchun 130024, China
4. Department of Resource Management, Tangshan Normal University, Tangshan 063000, China
5. School of Geographic Sciences, Xinyang Normal University, Xinyang 464000, China