1. Shandong University,School of Space Science and Physics,Weihai,China
2. China University of Mining and Technology,School of Environmental Science and Spatial Informatics,Xuzhou,China
3. Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology and Mineral Resources No.2 Geological Brigade),Jining,China
4. Dongtan Coal Mine, Yankuang Energy Group Co., Ltd,Jining,China
5. Inner Mongolia Haosheng Coal Industry Co., Ltd,Ordos,China