Identification_Information: Citation: Citation_Information: Originator: Cheryl Hapke Originator: David Reid Publication_Date: Unknown Title: Central California Shoreline Bias Values Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2006-1251 Publication_Information: Publication_Place: U.S. Geological Survey, Pacific Science Center, Santa Cruz, California Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2006/1251 Larger_Work_Citation: Citation_Information: Originator: Laura Moore Originator: Peter Ruggiero Originator: Jeff List Publication_Date: 2006 Publication_Time: Unknown Title: Comparing mean high water and high water line shorelines: Should proxy-datum offsets be incorporated in shoreline change analysis. Edition: Journal of Coastal Research Geospatial_Data_Presentation_Form: tabular digital data Series_Information: Series_Name: Journal of Coastal Research Issue_Identification: v.22, n.4, pp. 894-905 Publication_Information: Publication_Place: USGS Pacific Science Center, Santa Cruz California Publisher: USGS Coastal and Marine Geology Program Description: Abstract: The 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. These shorelines were used to calculate long-term and short-term change rates in a GIS using the Digital Shoreline Analysis System (DSAS) version 3.0; An ArcGIS extension for calculating shoreline change: U.S. Geological Survey Open-File Report 2005-1304, Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Miller, T.M. Shoreline vectors derived from historic sources (first three time periods) represent the high water line (HWL) at the time of the survey, whereas modern shorelines (final time period) represent the mean high water line (MHW). Changing the shoreline definition from a proxy-based physical feature that is uncontrolled in terms of an elevation datum (HWL) to a datum-based shoreline defined by an elevation contour (MHW) has important implications with regard to inferred changes in shoreline position and calculated rates of change. This proxy-datum offset is particularly important when averaging shoreline change rates alongshore. Since the proxy-datum offset is a bias, virtually always acting in the same direction, the error associated with the apparent shoreline change rate shift does not cancel during averaging and it is important to quantify the bias in order to account for the rate shift. The shoreline change rates presented in this report have been calculated by accounting for the proxy-datum bias. Purpose: 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 USGS National Assessment Project. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.010731 East_Bounding_Coordinate: -119.855878 North_Bounding_Coordinate: 38.201958 South_Bounding_Coordinate: 34.435196 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: Shoreline Theme_Keyword: Historic Shoreline Theme_Keyword: Shoreline Change Rate Theme_Keyword: Linear Regression Rate Theme_Keyword: Endpoint Rate Theme_Keyword: Baseline Theme_Keyword: Beach Erosion Theme_Keyword: Beach Nourishment Theme_Keyword: LIDAR Theme_Keyword: T-sheet Theme_Keyword: Tp-sheet Theme_Keyword: Coastal Survey Map Theme_Keyword: Bias Theme_Keyword: Offset Place: Place_Keyword_Thesaurus: General Place_Keyword: United States Place_Keyword: California Access_Constraints: None Use_Constraints: 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Science Center Contact_Address: Address_Type: mailing and physical address Address: 400 Natural Briges Drive City: Santa Cruz State_or_Province: Ca Postal_Code: 95060 Country: USA Contact_Voice_Telephone: (831)-427-4450 Contact_Facsimile_Telephone: (831)-427-4748 Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Eastern Standard Time Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Data_Quality_Information: Logical_Consistency_Report: The proxy-datum bias, and the associated uncertainty, is calculated at each of the 1-km blocks in which the average beach slope has been calculated. The nearest WIS station, wave buoy, and tide gage to each individual 1-km block were used in the application of Equation 1. Once the bias was calculated, it was incorporated into DSAS and applied on a transect-by-transect basis, so that the estimated bias is removed from the final long- and short-term shoreline change rates. Completeness_Report: The bias, averaged over 815 1-km sections of the California coast, was approximately 18 m with an average uncertainty of approximately 8.7m. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The bias uncertainty, averaged over 815 1-km sections of the California coast, was approximately 18 m with an average uncertainty of approximately 8.7m. Please see the Open File Report for more information (http://pubs.usgs.gov/of/2006/1219/) Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Cheryl Hapke Originator: David Reid Publication_Date: Unknown Title: THE NATIONAL ASSESSMENT OF SHORELINE CHANGE: A GIS Compilation of Vector Shorelines and Associated Shoreline Change Data for the Sandy Shorelines of the California Coast. Series_Information: Series_Name: Open-File Report Issue_Identification: 2006-1251 Publication_Information: Publication_Place: U.S. Geological Survey, Pacific Science Center, Santa Cruz, California Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2006/1251 Larger_Work_Citation: Citation_Information: Originator: Cheryl Hapke Originator: David Reid Originator: Bruce Richmond Originator: Peter Ruggiero Originator: Jeff List Publication_Date: Unknown Title: National Assessment of Shoreline Change: Part 3, Historical Shoreline Changes and Associated Coastal Land Loss Along the Sandy Shorelines of California Coast Series_Information: Series_Name: Open File Report Issue_Identification: 2006-1219 Publication_Information: Publication_Place: U.S. Geological Survey, Pacific Science Center, Santa Cruz Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2006/1219 Type_of_Source_Media: Tabular Vector Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: unknown Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Bias Value Source_Contribution: USGS Process_Step: Process_Description: In order to calculate the bias, as well as the bias uncertainty, for this regional shoreline change analysis, long-term best estimates and measures of uncertainty are derived for beach slope, wave height, wave length, and tide level. The best estimate for beach slope was derived by averaging individual lidar transect slope estimates within 1-km blocks along the coast. We take the long-term mean wave height and length to be the best estimate to use in the bias calculation. The long-term mean wave height is derived from USACOE Wave Information Studies (WIS) hindcasts while the long-term mean wave length is derived from long-term buoy records (NDBC and CDIP) along the California Coast. Finally, the best estimate of the tide level responsible for generating HWL shorelines is taken as the elevation of MHW. The measures of uncertainty for the beach slope, wave height, and wave length are estimated as the difference between the 95% exceedance statistic and the 50% exceedance statistic of the cumulative distributions. This gives a 90% confidence interval on each of the cumulative distributions. The uncertainty of assuming that the tide responsible for leaving HWL-type shorelines was at MHW is calculated simply by MHHW-MHW. The proxy-datum bias, and the associated uncertainty, is calculated at each of the 1-km blocks in which the average beach slope has been calculated. The nearest WIS station, wave buoy, and tide gage to each individual 1-km block were used in the application of Equation 1. Once the bias was calculated, it was incorporated into DSAS and applied on a transect-by-transect basis, so that the estimated bias is removed from the final long- and short-term shoreline change rates. The bias, averaged over 815 1-km sections of the California coast, was approximately 18 m with an average uncertainty of approximately 8.7m. Please See Below References for More information about the procedure: Ruggiero, P., Kaminsky, G.M., and Gelfenbaum, G., 2003, Linking proxy-based and datum-based shorelines on a high-energy coastline: Implications for shoreline change analyses: Journal of Coastal Research Special Issue 38, p. 57-82. Moore, L.J., Ruggiero, P.R. and List, J., 2006. Comparing high water line and datum-based shorelines: Implications for shoreline change. Journal of Coastal Research, v.22, n.4, pp. 894-905. Process_Date: Unknown Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Science Center Contact_Person: Bruce Richmond Contact_Address: Address_Type: mailing and physical address Address: 400 Natural Bridges Drive City: Santa Cruz State_or_Province: Ca Postal_Code: 95060 Country: USA Contact_Voice_Telephone: (831)-427-4450 Contact_Facsimile_Telephone: (831)-427-4748 Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Pacific Standard Time Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 15126 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -123.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.001024 Ordinate_Resolution: 0.001024 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Cencal_BiasValues Entity_Type_Definition: Bias Uncertainty Values Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: ID Attribute_Definition: Feature number. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Sequential Numbers defining the features. Attribute: Attribute_Label: DESCR Attribute_Definition: Detailed description of the feature. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Describes additional characteristics of feature. Attribute: Attribute_Label: BIAS Attribute_Definition: Shoreline Bias Value Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 10.1 Range_Domain_Maximum: 24.2 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: LT_MaxMin Attribute_Definition: Long-Term Bias Uncertainty Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 5.7 Range_Domain_Maximum: 15.9 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: ST_MaxMin Attribute_Definition: Short Term Bias Uncertainty Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 9.9 Range_Domain_Maximum: 27.5 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.1 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Pacific Science Center Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (831) Contact_Facsimile_Telephone: (831) Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Eastern Standard Time Resource_Description: USGS Open-File Report 2006-1219 Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ESRI Shapefile Format_Version_Date: 20060901 Format_Specification: Seven files comprise the ArcView shapefile: .dbf, .shp, .shx, .prj, .avl, .sbx, .sbn File_Decompression_Technique: no compression applied Transfer_Size: 0.038 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: USGS Pacific Science Center Fees: None Metadata_Reference_Information: Metadata_Date: 20060826 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Center for Coastal and Watershed Studies Contact_Person: Tara Miller Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 803-8747 Contact_Facsimile_Telephone: (727) 803-2032 Contact_Electronic_Mail_Address: taram@usgs.gov Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Eastern Standard Time Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile