U.S. Geological Survey 20210831 1.0 vector digital data data release doi:10.5066/P9YGIYFX Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.5066/P9YGIYFX https://www.sciencebase.gov/catalog/item/6102edd5d34ef8d7055eb42b Marie K. Bartlett Rachel E. Henderson Amy S. Farris Emily A. Himmelstoss 2021 1.0 vector digital data data release doi:10.5066/P9YGIYFX Reston, VA U.S. Geological Survey suggested citation: Bartlett, M.K., Henderson, R.E., Farris, A.S., Himmelstoss, E.A., 2021, Massachusetts shoreline change project, 2021 update–A GIS compilation of shoreline change rates calculated using Digital Shoreline Analysis System version 5.1, with supplementary intersects and baselines for Massachusetts: U.S. Geological Survey data release. https://doi.org/10.5066/P9YGIYFX https://www.sciencebase.gov/catalog/item/60ff22dad34e3ccd830d62aa https://doi.org/10.5066/P9YGIYFX The Massachusetts Office of Coastal Zone Management launched the Shoreline Change Project in 1989 to identify erosion-prone areas of the coast by compiling a database of historical (mid 1800's-1989) shoreline positions. Trends of shoreline position over long and short-term timescales provide information to landowners, managers, and potential buyers about possible future impacts to coastal resources and infrastructure. In 2001, a 1994 shoreline was added to calculate both long- and short-term shoreline change rates along ocean-facing sections of the Massachusetts coast. In 2013, two oceanfront shorelines for Massachusetts were added using 2008-2009 color aerial orthoimagery and 2007 topographic lidar datasets obtained from the National Oceanic and Atmospheric Administration's Ocean Service (NOAA), Coastal Services Center. In 2018, two new mean high water (MHW) shorelines for the Massachusetts coast extracted from lidar data between 2010-2014 were added to the dataset. This 2021 data release includes rates that incorporate one new shoreline from lidar data extracted in 2018 by the U.S. Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX), added to the existing database of all historical shorelines (1844-2014), for the North Shore, South Shore, Cape Cod Bay, Outer Cape, Buzzard’s Bay, South Cape, Nantucket, and Martha’s Vineyard. 2018 lidar data did not cover the Boston or Elizabeth Islands regions. Included in this data release is a proxy-datum bias reference line that accounts for the positional difference in a proxy shoreline (the High Water Line shoreline) and a datum shoreline (the Mean High Water shoreline). This issue is explained further in Ruggiero and List (2009) and in the process steps of the metadata associated with the rates. This release includes both long-term (~150+ years) and short term (~30 years) rates. Files associated with the long-term rates have “LT” in their names, files associated with short-term rates have "ST” in their names. This dataset includes a reference baseline used by the Digital Shoreline Analysis System (DSAS) to calculate rate-of-change statistics. This baseline layer serves as the starting point for orthogonally-oriented transects generated by the DSAS application. The transects intersect each shoreline and establish measurement points used to calculate shoreline-change rates. 2021 publication date Complete None planned -71.0481 -70.8745 42.3435 42.2474 ISO 19115 Topic Category oceans environment geoscientificInformation 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 USGS Thesaurus geospatial datasets coastal processes USGS Metadata Identifier USGS:6102edd5d34ef8d7055eb42b None Atlantic Coast United States North America New England Massachusetts Boston 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. These data are not to be used for navigation. U.S. Geological Survey Marie K. Bartlett mailing and physical

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-457-8700 x2306 508-547-2310 mbartlett@usgs.gov https://www.sciencebase.gov/catalog/file/get/6102edd5d34ef8d7055eb42b?name=Boston_baseline_browse.PNG Map view of data png Microsoft Windows 10 Version 6.2 (Build 9200) Esri ArcGIS 10.7.1.11595 Emily A. Himmelstoss Amy S. Farris Rachel E. Henderson Meredith G. Kratzmann Ayhan Ergul Ouya Zhang Jessica L. Zichichi 2018 publication software release version 5.0 Reston, VA U.S. Geological Survey https://code.usgs.gov/cch/dsas/ https://doi.org/10.5066/P9VW42I0 https://woodshole.er.usgs.gov/project-pages/DSAS/ Emily A. Himmelstoss Rachel E. Henderson Meredith G. Kratzmann Amy S. Farris 2018 publication Open-File Report 2018-1179 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20181179 https://woodshole.er.usgs.gov/project-pages/DSAS/ Peter Ruggiero Jeffrey H. List 200909 publication Journal of Coastal Research vol. 255 n/a Coastal Education and Research Foundation ppg. 1069-1081 https://doi.org/10.2112/08-1051.1 The attributes in this layer are based on the requirements for use within the Digital Shoreline Analysis System (DSAS) software. Each polyline has a unique identification attribute (ID). This field is used by the Digital Shoreline Analysis System (DSAS) to designate the alongshore order of baselines, if more than one baseline exists. This baseline file is complete and contains the baseline segment(s) used to cast transects along sections of the coastal region where shoreline position data were available 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 with respect to the time series of shoreline positions using standard editing tools in Esri's ArcMap v10.7.1. The baseline was positioned to conform to the overall orientation of the shorelines alongshore. This was done so that the transects, which are generated by the Digital Shoreline Analysis System from the baseline, would intersect roughly perpendicular to the general trend of the shorelines. This process step and all subsequent process steps were performed by the same person - Marie K. Bartlett 2020 Marie K. Bartlett U.S. Geological Survey mailing and physical

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x 2306 508-457-2310 mbartlett@usgs.gov The baseline shapefile was imported into a personal geodatabase in ArcCatalog v10.7.1 by right-clicking on the geodatabase > Import for use with the Digital Shoreline Analysis System (DSAS) software to perform rate calculations 2020 The baseline feature class was used as the input within the Digital Shoreline Analysis System (DSAS) software to generate transects and perform rate calculations. 2021 The baseline feature class was exported from a personal geodatabase to a shapefile in ArcCatalog v10.7.1 by right-clicking on the data layer > Export > To shapefile (single). 2021 The baseline shapefile was projected in ArcToolbox v10.7.1 > Data Management Tools > Projections and Transformations > Project. parameters: input projection - UTM zone 19N (WGS 84); output projection- geographic coordinates (WGS 84); transformation = none. 2021 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 21 0.0197383608 0.0265553774 Decimal seconds WGS_1984 WGS_84 6378137.0 298.257223563 Boston_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 used as a unique identifier of an object within a table primarily used in shapefiles. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. OBJECTID Internal feature number used as a unique identifier of an object within a table primarily used in a geodatabase. Esri Sequential unique whole numbers that are automatically generated. 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 baseline segments are numbered sequentially alongshore. U.S. Geological Survey 1 unlimited SHAPE_Leng Length of feature in meter units (UTM zone 19N, WGS 84) Esri 0 unlimited 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 - ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov The dataset contains the polyline baselines used for the analysis of shoreline data, (SHP and other shapefile components), browse graphic, and the FGDC CSDGM metadata in XML format. 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. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), and have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. 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 10.7.1 Esri polyline shapefile These files (.cpg, .dbf, .prj, .sbn, .sbx, .shp, .shp, 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 CSDGM-compliant metadata. no compression applied 1 https://www.sciencebase.gov/catalog/file/get/6102edd5d34ef8d7055eb42b https://www.sciencebase.gov/catalog/item/6102edd5d34ef8d7055eb42b https://doi.org/10.5066/P9YGIYFX The first link downloads all the files on the dataset landing page. The second link is to the dataset landing page where individual files can be viewed and downloaded. The third link is to the data release main landing page. 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 Marie K. Bartlett U.S. Geological Survey mailing and physical

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2306 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