1. U.S. Geological Survey, Eastern Geographic Science Center, Reston, VA 20192, U.S.A.
2. U.S. Geological Survey, Coastal and Marine Geology Program, Reston, VA 20192, U.S.A.
3. U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center, Sioux Falls, SD 57198, U.S.A.
4. U.S. Geological Survey, St. Petersburg Coastal & Marine Science Center-Baton Rouge Colocation office, Baton Rouge, LA 70801, U.S.A.
5. U.S. Geological Survey, Santa Cruz Coastal & Marine Science Center, Santa Cruz, CA 95060, U.S.A.