Department of Geography, University of Maryland, College Park, LeFrak Hall, College Park, MD 20741, United States ; Science Systems Application Inc., 10210 Greenbelt Road, Suite 600, Lanham, MD 20706, United States
Department of Environmental Science and Engineering, New University of Lisbon, Lisbon, 1600-500, Portugal
Hydrospheric and Biospheric Processes Laboratory, NASA, Goddard Space Flight Center, Code 614.4, Bldg 33, Greenbelt, MD 20771, United States