作者机构:[1]Institute of RS and GIS, Chengdu University of Technology, Chengdu 610059, China, [2]International Institute for Earth System Science, Nanjing University, Nanjing 210093, China
相关基金:Acknowledgments Funding support was obtained partially from the Science and Technology Bureau of Sichuan Province of China, NSF-China Project (40671132). The authors would like to thank Professor Hong Jiang, from Nanjing University, for his many important suggestions and discussions.