The 2007 islands shorelines were extracted as the zero meter elevation from U.S. Geological Survey processed EAARL lidar data. The mainland used for this file is from the National Oceanic and Atmospheric Administration (NOAA) Coastal Services Center and is their composite vector shoreline downloaded from (http://shoreline.noaa.gov/data/datasheets/composite.html, 2009). The NOAA Coastal Services Center's composite shoreline is a high-resolution vector shoreline based on a multi-temporal collection of NOAA shoreline manuscripts (T-sheets). It is critical that users refer to the source and date of the shoreline, since some areas of the U.S. are prone to erosion or accretion.