1. Shandong GEO-Surveying & Mapping Institute, Ji’nan 250012, China
2. China Institute of Geo-Environment Monitoring, Beijing 100081, China
3. National Engineering Research Center of Coal Mine Water Hazard Controlling, China University of Mining and Technology, Beijing 100083, China
4. Shandong Mingjia Surveying & Mapping Co., Ltd., Zibo 255086, China
5. Center for Hydrogeology and Environmental Geology, CGS, Baoding 071051, China