1. China University of Geosciences; Beijing 100083 China
2. The Institute of High and New Techniques applied to Land Resources; China University of Geosciences; Beijing 100083 China
3. Shandong Gold Geology and Mineral Exploration Co., Ltd.; Laizhou 261400 China
4. National Astronomical Observatories; Chinese Academy of Sciences; Beijing 100012 China
5. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources; Beijing 100083 China
6. School of Geographic and Oceanographic Sciences of Nanjing University; Nanjing 210093 China