| Description |
The U.S. Geological Survey (USGS) supports multiple efforts to understand and predict storm impacts to our nation’s coastlines. The geospatial dataset (vector feature class) and comma-delimited American Standard Code for Information Interchange (ASCII) table describes the changes in the elevation and cross-shore position of the modern foredune crest from September 1997 to October 2018 across the North Carolina ocean-fronted coastline, as well as infrastructure distance, beach width, and total water level (TWL) elevation information. Results are provided as points at an alongshore resolution of 500 meters (m) and describe the dune crest elevation (classified as ‘low’, ‘moderate’, or ‘high’), the dune crest elevation trend (classified as ‘eroding’, ‘no net change’, or ‘accreting’), and the dune crest migration trend (classified as ‘landward’, ‘no net change’, or ‘seaward’). The cross-shore distance between the dune crest and line of first infrastructure at the end of the study period, average beach width, and 98% quantile total water level elevation for the study period are also provided. Individual dune condition code positions (points) represent the center of an alongshore “bin” and describe coastal trends within 250 m alongshore on either side of the point. An ArcGIS Pro Map Package file is also included, which displays dune condition code and time series features with specific symbology and graphing schema that aid the user in interpreting and visualizing some of the most important attributes in the data. The methods used to generate this data followed the process outlined in “Decadal-scale characteristics of natural and anthropogenic dune morphology along North Carolina barrier islands (SE Atlantic coast)” by Seymour and others (2026). [More]
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