1. College of Astronautics Nanjing University of Aeronautics and Astronautics, Academy of Astronautics,Nanjing,China
2. Exploration Institute of Geophysical and Geochemical Exploration,Key Laboratory of Geochemical,Tianjin,China
3. Hubei institute of water resources survey and design Co., LTD Planning branch of flood control,Wuhan,China
4. University of Maryland,Department of Geographical Science,College Park,USA