Description: This impervious cover data set covers the 52 towns of the Piscataqua Region Estuaries Partnership (PREP) and identifies human-made surfaces that do not allow water to permeate through them. Naturally occurring impervious cover, such as exposed bedrock, is not included in the impervious class.The data set was derived by interpreting 1-foot resolution orthophotography, acquired in 2015, and delineating and updating impervious cover features.