1. Office of Research and Development, Environmental Protection Agency, Research Triangle Park, NC, USA
2. College of Environmental Science and Forestry, State University of New York, Syracuse, NY, USA
3. Western Geographic Science Center, U.S. Geological Survey, Seattle, WA, USA
4. Western Geographic Science Center, U.S. Geological Survey, Tucson, AZ, USA
5. Earth Resources and Observation Science (EROS) Center, U.S. Geological Survey, Sioux Falls, SD, USA