1. College of Geoscience and Survey Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2. Department of Computing, Hong Kong Polytechnic University, Hung Hom, Kowloon, HKSAR, Hong Kong, China
3. University of Texas at Dallas, Richardson, Texas 75080, United States
4. Department of Earth, Environmental and Resource Sciences, University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States