| Title: Impervious Surfaces in the Coastal Watershed of NH and Maine, High Resolution - 2021 | |
| Time Period of Content: 2021 | Initial Publication Date: 07/25/2022 |
| Originator: Earth Systems Research Center, University of New Hampshire | |
| Abstract: This data set maps impervious surfaces as of 2021 within the 52 towns of the Piscataqua Region Estuaries Partnership (PREP). It also includes impervious features as of 2015, thereby facilitating change analysis. The data set 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 updating previously delineated impervious features (developed using 2015 orthophotography) using 60-cm resolution, leaf-on, 4-band National Agriculture Imagery Program (NAIP) orthophotography acquired in 2021 as the basis for the update. Additional reference data sets, including older orthophoto imagery from 2015, were also used in the delineation of features. Funding for this project was provided by a grant from the Piscataqua Regional Estuaries Partnership as authorized by the U.S. Environmental Protection Agency's National Estuary Program. | |
| Theme Keywords: Impervious, Impervious cover, Impervious surface, Runoff, Land use, Landuse, Land cover, Landcover, Photo interpretation | |
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