1. School of Engineering Management and Real Estate, Henan University of Economics and Law, Zhengzhou, Henan 450046, China
2. Postdoctoral Station of Geography, Henan University, Kaifeng, Henan 475001, China
3. North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China
4. Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
5. Chongqing Institute of Resources and Sustainable Economic Development, Chongqing 400042, China