Cheryl Hapke David Reid 2007 vector digital data Open-File Report 2007-1112 U.S. Geological Survey, Pacific Science Center, Santa Cruz, California U.S. Geological Survey, Coastal and Marine Geology Program https://pubs.usgs.gov/of/2007/1112/NCal.zip https://pubs.usgs.gov/of/2007/1112/ Cheryl Hapke David Reid Krystal Green Mark Borrelli 2007 Open-File Report 2007-1112 U.S. Geological Survey, Pacific Science Center, Santa Cruz U.S. Geological Survey, Coastal and Marine Geology Program https://pubs.usgs.gov/of/2007/1112/ norcal1928_1935 There are critical needs for a nationwide compilation of reliable cliff edge data. To meet these needs, the USGS has produced a comprehensive database of digital vector cliff edges by compiling cliff edge positions from pre-existing historical cliff edge databases and by generating historical and modern cliff edge data. Cliff edges are compiled by state and generally correspond to two periods: 1920s-1930s and 1998-2002. Each cliff edge 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. Cliff edge vectors derived from both historic sources (first time period) and modern sources (final time period) represent the cliff edge at the time of the survey. Historical cliff erosion is considered to be a crucial element in studying the vulnerability of the national coastline. These data are used in a cliff erosion analysis for the USGS National Assessment Project. en 1928 1935 ground condition Complete None planned -124.443086 -122.965805 42.001897 38.245274 -124.409352-122.96791438.25326841.983706 General Cliff Edge Historic Cliff Edge Cliff Erosion Rate Endpoint Rate Baseline Cliff Erosion LIDAR 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 oceans and estuaries oceans and coastal geoscientificInformation Geographic Names Information System, USGS, Reston, VA United States California None Public domain data are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey (USGS) must be referenced as the originator of the dataset in any future products or research derived from these data. Cheryl Hapke U.S. Geological Survey Geologist mailing and physical address

Patuxent Wildlife Research Center

University of Rhode Island

317 Woodward Hall, Dept. of Geosciences

Kingston RI 02881 USA 401-874-5532 401-874-2190 chapke@usgs.gov Monday through Friday, 9 a.m. to 5 p.m., Eastern Standard Time Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 Cheryl Hapke David Reid 2007 1.0 Open-File Report 2007-1133 U.S. Geological Survey, Pacific Science Center, Santa Cruz U.S. Geological Survey, Coastal and Marine Geology Program https://pubs.usgs.gov/of/2007/1133/ Shapefile The data supplied here are a compilation of information collected from numerous National Ocean Service Coastal Survey Maps (often referred to as t-sheets or tp-sheets). In compiling this product we made no attempt to ascertain the congruency between the charted data, and the real world. Our objective was to simply capture the representative coastline as provided to us via the NOS survey maps. Every effort was made to capture the shoreline on these charts as faithfully as our skills and technology allowed, and there is every indication that we were successful to this end. However, in doing so, we automatically conveyed the character (all aspects, both good and bad) of those data to our digital product. A character which may or may not be in agreement with the real world. Because of this, the user is advised to exercise caution in making any assumptions about the fallibility, or infallibility, of the spatial information supplied here; especially when circumstances warrant a high degree of absolute positional accuracy. 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 13.9 meters. Please visit our full report on shoreline change in the Coastline of California (https://pubs.usgs.gov/of/2007/1133/), under the heading 'Uncertainties and Errors', for a complete explanation of the measurement error. U.S. Department of Commerce, National Oceanic and Atmospheric Administration (NOAA), National Environmental Satellite, Data, and Information Service (NESDIS), and National Ocean Service (NOS) Unknown vector digital data Historic Shoreline Database 1930s Shoreline Silver Spring, Maryland U.S. Department of Commerce, National Oceanic and Atmospheric Administration Senior cartographer, 1315 East-West Highway, Silver Spring, MD 20910-3282, Voice (301) 713-3226, FAX (301) 713-4176, Email <info_center@ngs.noaa.gov>. http://www.csc.noaa.gov/shoreline/ http://mapfinder.nos.noaa.gov paper 1928 1935 ground condition NOS T-Sheets NOAA NOS Topographic Sheets (t-sheet or tp-sheet maps) Cliff edges from one or more sources were sought in an effort to develop a single cliff edge for each time period. Digital cliff edges, if available from another agency, were acquired. If no digital cliff edges 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 cliff edges were digitized. Quality assessments were performed and cliff edges were edited to remove any overlap between adjacent cliff edges. No edgematching between adjacent cliff edges was attempted. Finally, cliff edges from all sources were merged to produce a single cliff edge for the period. The final cliff edge 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 cliff edge erosion rates. The attributes reflect the source of the data and the original survey year. 2006 Cheryl Hapke U.S. Geological Survey Geologist mailing and physical address

USGS Patuxent Wildlife Research Center

University of Rhode Island

Coastal Field Station

317 Woodward Hall, Dept. of Geosciences

Kingston RI 02881 USA 401-874-5532 401-874-2190 chapke@usgs.gov Monday through Friday, 8am to 5pm EST Data were projected from UTM zone 10 to geographic Tool: ArcGIS > ArcToolbox > Toolboxes > Data Management Tools > Project Command issued: ['GCS_North_American_1983',DATUM['D_North_American_1983',SHPERIOD['GRS_1980',6378137.0,298.25722101]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]] 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 Vector String 309Spatial_Reference_Information: SimplePolylineFALSE309FALSEFALSE 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NorCal1928_1935 Vector Cliff Edge from NOS T-Sheets U.S.Geological Survey Feature Class309 FID Internal feature number ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the feature. ID Feature number. U.S. Geological Survey 1 40677 Number9 DATE_ Date of ground condition U.S. Geological Survey 1928 1935 String10 DESCR Detailed description of the feature. U.S. Geological Survey Describes additional characteristics of the feature. String64 ACCURACY Position accuracy of feature. U.S. Geological Survey 0 The accuracy is not given but should be 1.4 meters. U.S. Geological Survey Number4 U.S. Geological Survey mailing and physical address

Pacific Science Center

400 Natural Bridges Drive

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 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. SHP Unspecified ESRI Polyline Shapefile. The DBF file contains the attribute data in dBASE format. The PRJ file contains the coordinate system information. The SBN and SBX files contain the spatial index of the geospatial data. The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The XML file contains the metadata describing the data set. zip archive 0.348 0.218 https://pubs.usgs.gov/of/2007/1112/NCal.zip https://pubs.usgs.gov/of/2007/1112/ Data are downloadable 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. 20070319 Cheryl Hapke U.S. Geological Survey mailing and physical address

USGS Patuxent Wildlife Research Center

University of Rhode Island

Coastal Field Station

317 Woodward Hall, Dept. of Geosciences

Kingston RI 02881 USA 401-874-5532 401-874-2190 chapke@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350norcal1928_1935-124.409352-122.96791441.98370638.2532681-124.409352-122.96791441.98370638.2532681ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\Emihimltxp\sea_disk (e)\CA_cliffs\metadata_1\review\May2007_final\Northern\norcal1928_1935.shpLocal Area Network0.218ShapefileGCS_North_American_19833092007050115563000200809161403500020080916