Cheryl Hapke David Reid 2006 1.1 vector digital data Open-File Report 2006-1251 Pacific Science Center, Santa Cruz, CA U.S. Geological Survey http://pubs.usgs.gov/of/2006/1251/NCal.zip Cheryl Hapke David Reid 2006 1.1 Open-File Report 2006-1251 Pacific Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.3133/ofr20061251 There are critical needs for a nationwide compilation of reliable shoreline data. To meet these needs, the U.S. Geological Survey (USGS) has produced a comprehensive database of digital vector shorelines by compiling shoreline positions from pre-existing historical shoreline databases and by generating historical and modern shoreline data. Shorelines are compiled by state and generally correspond to one of four time periods: 1800s, 1920s-1930s, 1970s, and 1998-2002. Each shoreline may represent a compilation of data from one or more sources for one or more dates provided by one or more agencies. Details regarding source are provided in the 'Data Quality Information' section of this metadata report. Shoreline vectors derived from historic sources (first three time periods) represent the high water line at the time of the survey, whereas modern shorelines (final time period) represent the mean high water line. Historical shoreline change is considered to be a crucial element in studying the vulnerability of the national shoreline. These data are used in a shoreline change analysis for the U.S. Geological Survey (USGS) National Assessment Project. 1945 1976 ground condition Complete None planned -124.408512 -122.966230 42.000012 38.232334 -124.408512 -122.966230 42.000012 38.232334 USGS Metadata Identifier USGS:b6994ac9-971b-4833-a277-3e5fec0425b7 None Shoreline Historic Shoreline Shoreline Change Rate Linear Regression Rate Endpoint Rate Baseline Beach Erosion T-sheet Tp-sheet Coastal Survey Map U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP ESRI polyline shapefile ISO 19115 Topic Category oceans elevation Marine Realms Information Bank (MRIB) keywords effects of coastal change coastal processes shoreline accretion shoreline erosion USGS Thesaurus Beach Nourishment LIDAR coastal processes erosion shoreline accretion Coastal and Marine Ecological Classification Standard (CMECS) Continental/Island Shore Complex General United States California Coastal and Marine Ecological Classification Standard (CMECS) Northern California Ecoregion Coastal and Marine Ecological Classification Standard (CMECS) Substrate None This data set is not to be used for navigational purposes. Public domain data from the U.S. government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780 Cheryl J. Hapke David Reid Bruce M. Richmond Peter Ruggiero Jeff List 2006 1.0 Open-File Report 2006-1219 Pacific Science Center, Santa Cruz, CA U.S. Geological Survey http://pubs.usgs.gov/of/2006/1219/ There is significant agreement of linework between adjacent shorelines. Shorelines were checked for accuracy, but no edgematching attempts were made between adjacent shorelines even if slight offsets existed. This shoreline data adequately represented the shoreline at the time of the survey. Remaining gaps in this data, if applicable, are a consequence of non-existing data or existing data that did not meet quality assurance standards. The maximum estimated positional error for this shoreline is 10.1 meters. Please visit our full report on shoreline change in the Coastline of California (http://pubs.usgs.gov/of/2006/1219/), under the heading 'Uncertainties and Errors', for a complete explanation of the measurement error. U.S. Geological Survey 2006 vector digital data Denver, CO U.S. Geological Survey California Spatial Information Library (CASIL) 900 N St. Sacramento, Ca. 95814 (916) 653-1369 http://gis.ca.gov/DRG.epl http://topomaps.usgs.gov/drg/ Vector Shorelines 1952 1971 ground condition USGS DRGs USGS Digital Raster Graphics Shorelines from one or more sources were sought in an effort to develop a single shoreline for each time period. Digital shorelines, if available from another agency, were acquired. If no digital shorelines were available or if a data set was incomplete, T-sheets were requested from NOAA and received as scanned raster images. T-sheets were geo-registered using ERDAS Imagine geographic imaging software by placing 6-10 well-spaced ground control points at gridline intersections. Some T-sheets may have required additional coordinate transformation information from NOAA to account for datum offsets between historical datums (USSD) and modern datums (NAD27 or NAD83). Datum transformations were applied to GCP coordinates prior to registration. Total RMS error for the rectification process was maintained below 1 pixel, which translates to approximately 4m at a scale of 1:20,000 and 1.5m at a scale of 1:10,000. Geo-registered T-sheets were loaded in ArcView and vector shorelines were digitized. Where historical T-sheets were unavailable USGS Digital Raster Graphics from the California Spatial Information Library were downloaded and the shoreline was digitized from the georeferenced maps. Please see http://gis.ca.gov/DRG.epl for more information. Quality assessments were performed and shorelines were edited to remove any overlap between adjacent shorelines. No edgematching between adjacent shorelines was attempted. Finally, shorelines from all sources were merged to produce a single shoreline for the period. The final shoreline was coded with 6 attribute fields (ID, Type, Date, Descr, Source, and Accuracy) required for the Digital Shoreline Analysis System (DSAS), which was used to calculate shoreline change rates. The attributes reflect the source of the data and the original survey yea r. Process date is estimated. 2002 Bruce Richmond U.S. Geological Survey mailing and physical address

Pacific Science Center

2885 Mission Street

Santa Cruz Ca 95060 USA (831) 427-4450 (831) 427-4748 Monday through Friday, 8 a.m. to 5 p.m., Pacific Standard Time Data were projected from UTM zone 10 to geographic with Datum shift from NAD27 to NAD83_6 Tool: ArcGIS > ArcToolbox > Toolboxes > Data Management Tools > Project Command issued: ['GCS_North_American_1983',DATUM['D_North_American_1983', SPHEROID['GRS_1980',6378137.0,298.257222101]], PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]] NAD_1927_To_NAD_1983_6 20070215 Emily Himmelstoss U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2262 (508) 457-2310 ehimmelstoss@usgs.gov Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20170207 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 from Coastal and Marine Ecological Classification Standard (CMECS) to metadata. 20180426 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 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 Edited metadata to perform minor edits to bring the metadata up to current PCMSC standards. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata dates to determine which metadata file is most recent. 20211025 U.S. Geological Survey Susan Cochran Geologist Mailing and Physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7545 scochran@usgs.gov Vector String 119 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Norcal1952_1971 Vector Shoreline from NOS T-Sheets USGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. ID Feature number. U.S. Geological Survey 1 40677 TYPE Type of feature. U.S. Geological Survey Shoreline Vector shoreline. U.S. Geological Survey DESCR Detailed description of the feature. U.S. Geological Survey Describes additional characteristics of the feature. SOURCE Agency that provided feature or data used to create feature. U.S. Geological Survey NOAA NOS T-Sheets NOAA U.S. Geological Survey ACCURACY Position accuracy of feature. U.S. Geological Survey 0 0 meters U.S. Geological Survey mailing and physical address

Pacific Science Center

2885 Mission Street

Santa Cruz Ca 95060 USA (831) 427-4450 (831) 427-4748 Monday through Friday, 8 a.m. to 5 p.m., Eastern Standard Time Downloadable Data: USGS Open-File Report 2006-1251 Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, 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 data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. shapefile 20060901 ESRI polyline shapefile Seven files comprise the ArcView shapefile: <filename>.dbf, <filename>.shp, <filename>.shx, <filename>.prj, <filename>.avl, <filename>.sbx, <filename>.sbn zip archive 0.654 http://pubs.usgs.gov/of/2006/1251/NCal.zip http://pubs.usgs.gov/of/2006/1251/#gis Data may be downloaded via the World Wide Web (WWW). None These data are available in Environmental Systems Research Institute (ESRI) 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. 20211025 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time