Cheryl Hapke David Reid 2006 1.0 vector digital data Open-File Report 2006-1251 Pacific Science Center, Santa Cruz, CA U.S. Geological Survey, Coastal and Marine Geology Program Cheryl Hapke David Reid 2006 1.0 Open-File Report 2006-1251 Pacific Science Center, Santa Cruz, CA U.S. Geological Survey, Coastal and Marine Geology Program http://pubs.usgs.gov/of/2006/1251/ Socal_1998 http://pubs.usgs.gov/of/2006/1251/SCal.zip 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. en 1998 ground condition Complete None planned -119.998365 -117.131602 34.456515 32.576153 -119.998365 -117.131602 34.456515 32.576153 General Shoreline Historic Shoreline Shoreline Change Rate Linear Regression Rate Endpoint Rate Baseline Beach Erosion Beach Nourishment 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 environment geoscientificInformation California United States General 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 Science Center Bruce Richmond mailing and physical address

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 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, Coastal and Marine Geology Program http://pubs.usgs.gov/of/2006/1219/ Shapefile 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 positional error for this shoreline, considered independently, is 1.5m. However, if the lidar mean high water shoreline (mhwl) is used for comparison with other high water shorelines (hwl), an additional shoreline proxy offset must be considered. When the offset error is considered, as it pertains to lidar shorelines of the coastline of California, it varies based on beach slope, wave height, wave length, and tide level. Calculations of these parameters along the open coastline of California were made in order to quantify this bias offset. Please visit our full report on shoreline change along the sandy shoreline of the coast of California (http://pubs.usgs.gov/of/2006/1219/), under the heading 'Uncertainties and Errors', for a complete explanation of the measurement error. 19980410 ground condition Lidar Vector Shoreline Lidar USGS/NASA Airborne Topographic Mapper The USGS in collaboration with NASA, used the NASA Airborne Topographic Mapper (ATM II and III) mounted on a Twin Otter Aircraft to map coastal beaches. The raw data was georeferenced at elevation points every few square meters. The original data from ATM was collected in WGS 84, ITRF 97, in a geographic (lat/long) coordinate system with irregular spacing. The data was then converted to NAD 83 and NAVD 88. The shoreline generation involved an analysis of shore-normal profiles at 20m intervals alongshore. First, a shore-parallel reference line was digitized as a permanent baseline for any future shoreline generation. Profiles were assessed at 20m intervals perpendicular to the reference line. Each profile consisted of a 4m wide swath of data points. An algorithm determined the shoreline position for each profile based on a regression fit through the foreshore of the profile. The function was evaluated at the mean high water (mhw) level to identify the horizontal position of the shoreline. Results were only accepted if the R-squared value of the regression was significant to the 95% confidence level. The shoreline point solutions were then quality checked in ArcView GIS software against a gray scale elevation grid of the same data. Point solutions were connected to produce a continuous vector shoreline in shapefile format. U.S. Geological Survey Bruce Richmond mailing and physical address

Pacific Science Center

Santa Cruz Ca 95060 USA

400 Natural Bridges Drive

(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 a datum shift from NAD27 to NAD83 Tool: ArcGIS > ArcToolbox > Toolboxes > Data Management Tools > Project Command issued: GEOGCS['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_NADCON 20070716 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 ArcGIS 9.2 Toolbox Vector String 15527 Simple FALSE FALSE TRUE Polyline 15527 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 Decimal degrees0.0000000.000000 Socal_1998 15527 Feature Class Vector Shoreline from Lidar OverflightUSGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. 0 FID OID 0 4 ACCURACY Position accuracy of feature. U.S. Geological Survey 0 The accuracy is not given or is not known. U.S. Geological Survey ACCURACY Number 3 Shape Feature geometry. ESRI Coordinates defining the features. Shape Number 9 ID Feature number. U.S. Geological Survey 1 40677 ID String 20 TYPE Type of feature. U.S. Geological Survey Shoreline Vector shoreline. U.S. Geological Survey TYPE String 10 DESCR Detailed description of the feature. U.S. Geological Survey Describes additional characteristics of the feature. DESCR String 64 SOURCE Agency that provided feature or data used to create feature. U.S. Geological Survey SOURCE String 32 Describes source data of the feature. DATE_DATE_Number4Date of Lidar Over FlightUSGS1998041019980410 U.S. Geological Survey mailing and physical address

Pacific Science Center

Santa Cruz Ca 95060 USA

400 Natural Bridges Drive

(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. SHP 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 1.361 1.361 20060901no compression applied http://pubs.usgs.gov/of/2006/1251/SCal.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. 20070716 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 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time en NoneNonehttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile20070301 Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780 -119.998365 34.456515 32.576153 -117.131602 1 Socal_1998 -119.998365 34.456515 32.576153 -117.131602 1 002 Local Area Network file://\\gisdata\data01\regional\westcoast\shoreline_change\ca_coast\geo\socal\Socal_1998.shp 1.361 Shapefile 20060726 20070716 13570500 FALSE 20070301 FALSE 19232200 10054400 {CD5C6A71-AA8A-400F-AC93-DDCAF079519E} 20070716 dataset ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 GCS_North_American_1983 15527