College of Information Engineering, Chengdu University of Technology Chengdu 610059, Sichuan, China;2. Sichuan Province key laboratory of mathematics geology,Chengdu Sichuan 610059,China;3. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037, China;4. The College of Mathematics and Information Science, Neijiang Normal University, Neijiang 641112, Sichuan, China;5. Beijing SD Science and Technology Development Co. ,Ltd. , Beijing 100011, China;6. Institute of Engineering Surveying, Sichuan College of Architectural Technology, Deyang 618000, Sichuan, China