1. George Mason University, MSN 6E1,Center for Spatial Information Science and Systems,Fairfax,VA,USA,22030
2. NASA Goddard Space Flight Center,Goddard Earth Sciences Data and Information Services Center,Greenbelt,MD,USA,20771
3. ADNET Systems, Inc. and NASA Goddard Space Flight Center, Code 619,Greenbelt,MD,USA,20771