NASA/GSFC, Code 584, Greenbelt, Md 20771 United States
University of Maryland Department of Geography, 2181 LeFrak Hall, College Park, Md 20741 United States
University of Maryland Department of Geography, 2181 LeFrak Hall, College Park, Md 20741 United States ; University of Maryland Department of Georgraphy, 2181 LeFrak Hall, College Park, Md 20742 United States