Kara S. Doran Justin J. Birchler Kirsten J. Bendik 20240611 2.0 vector digital data Kara S. Doran Justin J. Birchler Kirsten J. Bendik 20190813 3.0 U.S. Geological Survey data release doi:10.5066/P9BW6CG6 St. Petersburg, FL U.S. Geological Survey https://doi.org/10.5066/P9BW6CG6 The National Assessment of Coastal Change Hazards project at the U.S. Geological Survey (USGS) exists to understand and predict storm impacts to our nation's coastlines. This geospatial dataset defines the alongshore extent of overwash sediments deposited along the Louisiana coast and attributed to coastal processes during [Atlantic Basin] Hurricane Delta, which made landfall in the U.S. on October 9, 2020. To provide alongshore extents of overwash deposits caused by Hurricane Delta. 20201010 20201011 ground condition Complete None planned -93.754469 -92.280616 29.778053 29.532398 USGS Metadata Identifier USGS:568a470b-70ad-4249-8fe0-a2b16267b049 None U.S. Geological Survey USGS St. Petersburg Coastal and Marine Science Center Coastal and Marine Hazards and Resources Program CMHRP SPCMSC ISO 19115 Topic Category geoscientificInformation oceans environment USGS Thesaurus hazards marine geology ocean sciences coastal processes sand deposits sedimentation Geographic Names Information System State of Louisiana None Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originators of the data in future products or derivative research. U.S. Geological Survey Kara S. Doran mailing and physical

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Saint Petersburg FL 33701 UNITED STATES 727-502-8117 727-502-8001 kdoran@usgs.gov Microsoft Windows 10 Version 1909 (Build 18363.1500); Esri ArcMap 10.7.1; Global Mapper 21.1 Birchler, J.J., Doran, K.S., Long, J.W., and Stockdon, H.F. 2019 U.S. Geological Survey Open-File Report 2019-1095 doi:10.3133/ofr20191095 St. Petersburg, Florida U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center https://doi.org/10.3133/ofr20191095 Data were reviewed for quality analysis/quality control (QA/QC'd) by an independent researcher using NOAA photography. This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details. No formal horizontal positional accuracy tests were conducted. Geographic coordinates were projected to the North American Datum of 1983 (NAD 83) Universal Transverse Mercator Zone 15 North (UTM 15N) coordinate system. No formal positional vertical accuracy tests were conducted. Data was not projected or referenced to a vertical coordinate system. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division 20200827 Silver Spring, MD NOAA's Ocean Service, National Geodetic Survey (NGS) https://storms.ngs.noaa.gov/storms/delta/index.html online digital data 20201010 20201011 ground condition NOAA post-storm Post-storm imagery used to determine overwash extent. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division 201601 Silver Spring, MD NOAA's Ocean Service, National Geodetic Survey (NGS) https://geodesy.noaa.gov/storm_archive/storms/index.shtml online digital data 201501 present ground condition NOAA pre-storm Pre-storm imagery used to determine whether overwash occurred. Overwash extents were manually delineated, using editing tools in ArcMap (10.7.1) by comparing the coastline in Louisiana with pre-storm and post-storm imagery. In order to determine whether overwash had occurred in the study area, USGS staff searched for new sand deposits over roads, marshes and vegetation using methods in Birchler and others (2019). NOAA pre-storm NOAA post-storm 20201016 Overwash extents were QA/QC'd by an independent, second researcher at the USGS using NOAA photography to determine if any features were erroneously identified as overwash but were actually dune erosion (Birchler and others, 2019). The final dataset is a polyline shapefile (.shp) that represent the overwash extent from Hurricane Delta in October 2020. NOAA pre-storm NOAA post-storm 20201102 Delta_Overwash_Extent.shp The final overwash extent shapefile was converted to a Zipped Keyhole Markup Language (.kmz) file using tools in Global Mapper 21.1 for use with non-proprietary software. Delta_Overwash_Extent.shp 20210223 Delta_Overwash_Extent.kmz This metadata record was versioned in conjunction with version 3.0 of the data release to remove the USGS obliques source citation. 20240611 Vector String 84 Universal Transverse Mercator 15 0.9996 -93.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North American Datum of 1983 GRS_1980 6378137.0 298.257223563 Delta_Overwash_Extent.shp Attribute table of the delineated overwash extents from the landfall of Hurricane Delta in 2020. USGS FID Overwash segment identification number. Esri 0 83 Shape Feature geometry. Esri Coordinates defining the features. TYPE The type of substrate in which the overwash extent deposited onto. If the field is left blank, the overwash extent did not cover any of the substrates defined below. USGS MARSH The substrate onto which overwash sediments are deposited. USGS SHAPE_Leng Length of line segment, in meters. Esri 0.672306 16401.989658 meters U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center USGS SPCMSC Data Management mailing and physical

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Saint Petersburg FL 33701 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov Delta_Overwash_Extent.shp, Delta_Overwash_Extent.kmz This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Shapefile, KML The data download file is compressed and must be unzipped using software such as WinZip, 7Zip, etc. before use. https://coastal.er.usgs.gov/data-release/doi-P9BW6CG6/data/Delta_Overwash_Extent.zip None None 20240809 U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center USGS SPCMSC Data Management mailing and physical

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Saint Petersburg FL 33701 United States 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998