Gibbs, Ann E. Ohman, Karin A. Coppersmith, Ryan Richmond, Bruce M. 2017 vector digital data (polyline) data release 10.5066/F72Z13N1 U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA U.S. Geological Survey https://www.sciencebase.gov/catalog/file/get/59431779e4b062508e309c52 Gibbs, Ann E. Ohman, Karin A. Coppersmith, Ryan Richmond, Bruce M. 2017 data release 10.5066/F72Z13N1 Reston, VA U.S. Geological Survey https://doi.org/10.5066/F72Z13N1 This dataset includes a reference baseline used by the Digital Shoreline Analysis System (DSAS) to calculate rate-of-change statistics for the exposed north coast of Alaska coastal region between the U.S. Canadian Border to the Hulahula River for the time period 1947 to 2010. This baseline layer serves as the starting point for all transects cast by the DSAS application and can be used to establish measurement points used to calculate shoreline-change rates. The Arctic Coastal Plain of northern Alaska is an area of strategic economic importance to the United States, is home to remote Native American communities, and encompasses unique habitats of global significance. Coastal erosion along the north coast of Alaska is chronic, widespread, may be accelerating, and is threatening defense and energy-related infrastructure, natural shoreline habitats, and Native Alaskan communities. There is an increased demand for accurate information regarding past and present shoreline changes across the United States. 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 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 2017 publication date Complete None planned -144.018104085 -140.999965555 70.1555329206 69.6475501611 North coast of Alaska between the U.S. Canadian Border and the Hulahula River USGS Metadata Identifier USGS:59431779e4b062508e309c52 None Baseline Shoreline Shoreline Change Digital Shoreline Analysis System DSAS U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Pacific Coastal and Marine Science Center PCMSC National Assessment of Shoreline Change Project ISO 19115 Topic Category oceans environment geoscientificInformation USGS Thesaurus coastal processes Data Categories for Marine Planning Habitat Marine Realms Information Bank (MRIB) keywords shoreline accretion shoreline erosion Geographic Names Information System (GNIS) North Slope Beaufort Sea Demarcation Bay Jago River Barter Island Kaktovik Okpilak River Hulahula River State of Alaska Arctic National Wildlife Refuge United States of America None Arctic ANWR None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. Ann E. Gibbs U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA 831-460-7540 831-427-4748 agibbs@usgs.gov EastBeaufortExtent.jpg Map of the East Beaufort subregion of the north coast of Alaska shoreline change assessment area. JPEG U.S. Geological Survey Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.1 (Build 3035) Service Pack 1 (Build 3143) Gibbs, A.E. Richmond B.M. 2017 Open-File Report 2017-1107 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20171107 Ann E. Gibbs Bruce M. Richmond 2015 Open-File Report 2015-1048 Reston, VA U.S. Geological Survey https://dx.doi.org/10.3133/ofr20151048 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 at time of use was 4.3 https://woodshole.er.usgs.gov/project-pages/DSAS/version4/index.html https://woodshole.er.usgs.gov/project-pages/DSAS/ The attribute in this layer is based on the requirements for use within the Digital Shoreline Analysis System (DSAS) software (Theiler and others, 2009). The data have been quality checked. All polylines have a unique identification attribute (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. Adjacent baseline segments do not overlap and are not necessarily continuous. This baseline file is complete and contains all baseline segments used to cast transects where shoreline data are present to calculate a rate of change. 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 formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable. Baselines were constructed offshore from the time series of shoreline positions using standard editing tools in Esri ArcMap v. 10.3 The baselines were positioned to conform to changes in the orientation of the historical shorelines also presented in this data release. This was done so that transects, which are generated by the Digital Shoreline Analysis System v 4.3 from the baseline, would intersect perpendicular to the general trend of the shorelines. 2016 The baseline feature class was exported from a personal geodatabase to a shapefile in ArcCatalog (v.10.3) by performing a right-mouse click on the data layer > export > to shapefile (single). 2016 The baseline shapefile was projected in Esri's ArcToolbox (v.10.3) > Data Management Tools > Projections and Transformations > Feature > Project. Parameters: input projection - UTM zone XN (NAD83; where X is the corresponding UTM Zone); output projection- geographic coordinates (WGS 84) using the Geographic Transformation WGS_1984_(ITRF00)_To_NAD_1983. 2016 Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 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 12 0.0196122203 0.0549232893 Decimal seconds D_WGS_1984 WGS_1984 6378137.0 298.257223563 Attribute Table Table containing attribute information associated with the data set. Producer defined 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 12 The entity and attribute information provided here describes the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set. The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. U.S. Geological Survey - Science Base mailing and physical address

CenterDenver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 CA 888-275-8747 sciencebase@usgs.gov EastBeaufort_exposed_baseline.shp Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Vector Digital Data Set (Polyline) 9.0 Esri polyline shapefile This WinZip file contains the baseline shapefile for use generating transects within the Digital Shoreline Analysis System for the East Beaufort Sea coast of Alaska and associated metadata. Use WinZip or pkUnzip 0.01 https://www.sciencebase.gov/catalog/file/get/59431779e4b062508e309c52 https://doi.org/10.5066/F72Z13N1 Data are downloadable via the World Wide Web (WWW). None This zip file contains data available in Environmental Systems Research Institute (Esri) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com. 20201019 Ann E. Gibbs U.S. Geological Survey, Pacific Coastal and Marine Science Center Geologist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA 831-460-7540 831-427-4748 agibbs@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time