1. National Demonstration Center for Environmental and Planning, College of Geography and Environmental Science, Henan University, Kaifeng, China
2. Henan Engineering Research Center for Control and Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng, China
3. Ministry of Education, Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Kaifeng, China
4. College of Software, Henan University, Kaifeng, China