U.S. Geological Survey 2017 1 vector digital data data release DOI:10.5066/F74X55X7 Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.5066/F74X55X7 https://www.sciencebase.gov/catalog/item/58b8913be4b01ccd5500c30c https://www.sciencebase.gov/catalog/file/get/58b8913be4b01ccd5500c30c M.G. Kratzmann E.A. Himmelstoss E.R. Thieler 2017 1 data release DOI:10.5066/F74X55X7 Reston, VA U.S. Geological Survey https://doi.org/10.5066/F74X55X7 https://www.sciencebase.gov/catalog/item/58055f50e4b0824b2d1c1ee7 Sandy ocean beaches are a popular recreational destination, often surrounded by communities containing valuable real estate. Development is on the rise despite the fact that coastal infrastructure is subjected to flooding and erosion. As a result, there is an increased demand for accurate information regarding past and present shoreline changes. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is compiling existing reliable historical shoreline data along open-ocean sandy shores of the conterminous United States and parts of Alaska and Hawaii under the National Assessment of Shoreline Change project. There is no widely accepted standard for analyzing shoreline change. Existing shoreline data measurements and rate calculation methods vary from study to study and prevent combining results into state-wide or regional assessments. The impetus behind the National Assessment project was to develop a standardized method of measuring changes in shoreline position that is consistent from coast to coast. The goal was to facilitate the process of periodically and systematically updating the results in an internally consistent manner. This dataset includes a reference baseline used by the Digital Shoreline Analysis System (DSAS) to calculate rate-of-change statistics for central North Carolina from Cape Hatteras to Cape Lookout. This baseline layer serves as the starting point for all transects cast by the DSAS application. The transects intersect each shoreline and establish measurement points used to calculate shoreline-change rates. Rates of long-term and short-term shoreline change were generated in a GIS using the DSAS version 4.3- An ArcGIS extension for calculating shoreline change: U.S. Geological Survey Open-File Report 2008-1278, Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Ergul, Ayhan. 2017 publication date Complete None planned -76.570522 -75.524387 35.232015 34.579041 USGS Metadata Identifier USGS:58b8913be4b01ccd5500c30c None Baseline Shoreline Shoreline Change Digital Shoreline Analysis System DSAS U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Woods Hole Coastal and Marine Science Center WHCMSC National Assessment of Shoreline Change Project ISO 19115 Topic Category oceans environment geoscientificInformation Marine Realms Information Bank (MRIB) Keywords effects of coastal change coastal processes shoreline accretion shoreline erosion USGS Thesaurus coastal processes erosion shoreline accretion None North Carolina NC Cape Hatteras Green Island Ocracoke Island Ocracoke Inlet Portsmouth Island Horsepen Point Cape Lookout Atlantic Coast United States North America None Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. U.S. Geological Survey E.A. Himmelstoss mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 508-547-2310 ehimmelstoss@usgs.gov Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552 Robert A. Morton Tara L. Miller 2005 Open-File Report 2005-1401 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2005/1401/ E.R. Thieler E.A. Himmelstoss J.L. Zichichi A. Ergul 2009 Open-File Report 2008-1278 Reston, VA U.S. Geological Survey Current version of software at time of use was 4.3 https://woodshole.er.usgs.gov/project-pages/DSAS/version4/ https://woodshole.er.usgs.gov/project-pages/DSAS/ E.A. Himmelstoss M.G. Kratzmann E.R. Thieler 2017 Open-File Report 2017-1015 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20171015 The attribute in this layer is based on the requirements for use within the Digital Shoreline Analysis System (DSAS) software (USGS Open-File Report 2008-1278). The data have been quality checked. The polyline has an identification attribute field (ID). This field is used by the Digital Shoreline Analysis System (DSAS) to designate the alongshore order of baselines if there are more than one. This baseline file is complete and contains the two baseline segments used to cast transects along sections of the central North Carolina coastal region where lidar shoreline position data were available and additional shoreline data are present to calculate either a short- or long-term rate. The baseline serves as a reference point for transects cast by the Digital Shoreline Analysis System (DSAS) software. It does not correspond to any real-world feature. A baseline was constructed offshore from the time series of shoreline positions using standard editing tools in Esri's ArcMap v10. The baseline was positioned to conform to changes in the combined orientation of the shorelines alongshore. This was done so that the transects, which are generated by the Digital Shoreline Analysis System v4.3 from the baseline, would intersect perpendicular to the general trend of the shorelines. This process step and all subsequent process steps were performed by the same person - M.G. Kratzmann. 2014 M.G. Kratzmann U.S. Geological Survey mailing address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 508-457-2310 mkratzmann@usgs.gov The baseline feature class was imported into a personal geodatabase in ArcCatalog v10.2 by right-clicking on the geodatabase > Import for use with the Digital Shoreline Analysis System (DSAS) v4.3 software to perform rate calculations. 20160509 The baseline feature class was exported from a personal geodatabase to a shapefile in ArcCatalog v10.2 by performing a right-mouse click on the data layer > export > to shapefile (single). 20160512 The baseline shapefile was projected in ArcToolbox v10.2 > Data Management Tools > Projections and Transformations > Project. parameters: input projection - UTM zone 18N (WGS 84); output projection- geographic coordinates (WGS 84); transformation = none. 20160512 Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20170825 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Added keywords section with USGS persistent identifier as theme keyword. Process performed on 20200810. The metadata title was modified to move the location name to the beginning of the title to account for the alphabetical listing of the individual records when ScienceBase migrates the data release to a new platform and "flattens" the data release structure (20260302). 20260302 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Vector String 2 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 NCcentral_baseline Reference baseline used by the Digital Shoreline Analysis System (DSAS) to calculate rate-of-change statistics U.S. Geological Survey FID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. ID Field required by the Digital Shoreline Analysis System (DSAS) software. DSAS uses this value to determine the ordering sequence of transects when the baseline feature contains multiple segments. Individual segments are numbered sequentially alongshore. U.S. Geological Survey 1 2 The entity and attribute information provided here describes the tabular data associated with the dataset. Please review the individual attribute descriptions for detailed information. U.S. Geological Survey U.S. Geological Survey mailing and physical address

Denver Federal Center

Building 810

MS 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Shapefile ArcGIS 10.2 Esri polyline shapefile These files (.cpg, .dbf, .prj, .sbn, .sbx, .shp, .shp.xml, and .shx) are a collection of files with a common filename prefix and must be downloaded and stored in the same directory. Together they are the components of the shapefile and include FGDC compliant metadata. no compression applied 0.001 https://www.sciencebase.gov/catalog/file/get/58b8913be4b01ccd5500c30c https://www.sciencebase.gov/catalog/item/58b8913be4b01ccd5500c30c https://www.sciencebase.gov/catalog/item/58055f50e4b0824b2d1c1ee7 https://doi.org/10.5066/F74X55X7 The first link downloads the contents of the data page as a zip file, the second link is to the landing page of the data, the third and fourth links are to the main landing page of the data release. None These data are available in a polyline shapefile format. The user must have software to read and process the data components of a shapefile. 20260302 M.G. Kratzmann U.S. Geological Survey mailing address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 508-547-2310 whsc_data_contact@usgs.gov The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240319) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time