Identification_Information: Citation: Citation_Information: Originator: Robert Morton Originator: Tara Miller Publication_Date: 2004 Title: Offshore Baseline for Texas Generated to Calculate Shoreline Change Rates Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2004-1089 Publication_Information: Publication_Place: U.S. Geological Survey, Center for Coastal and Watershed Studies, St. Petersburg, FL Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2004/1089/ Larger_Work_Citation: Citation_Information: Originator: Robert Morton Originator: Tara Miller Originator: Laura Moore Publication_Date: 2004 Title: National Assessment of Shoreline Change: Part 1, Historical Shoreline Changes and Associated Coastal Land Loss Along the U.S. Gulf of Mexico Series_Information: Series_Name: Open-File Report Issue_Identification: 2004-1043 Publication_Information: Publication_Place: U.S. Geological Survey, Center for Coastal and Watershed Studies Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2004/1043/ Online_Linkage: http://coastal.er.usgs.gov/national-assessment/ Description: Abstract: Rates of long-term and short-term shoreline change were generated in a GIS with the Digital Shoreline Analysis System (DSAS) version 2.0, an ArcView extension developed by the USGS in cooperation with TPMC Environmental Services. The extension is designed to efficiently lead a user through the major steps of shoreline change analysis. This extension to ArcView contains three main components that define a baseline, generate orthogonal transects at a user-defined separation along the coast, and calculate rates of change (linear regression, endpoint rate, average of rates, average of endpoints, jackknife). 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: 2003 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -97.373952 East_Bounding_Coordinate: -93.907110 North_Bounding_Coordinate: 29.673165 South_Bounding_Coordinate: 25.957144 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 Place: Place_Keyword_Thesaurus: General Place_Keyword: United States Place_Keyword: Gulf of Mexico Place_Keyword: Texas 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, Center for Coastal and Watershed Studies 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 Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Eastern Standard Time Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.3.0.800 Data_Quality_Information: Positional_Accuracy: Horizontal_Positional_Accuracy: Lineage: Process_Step: Process_Description: A baseline was manually constructed seaward of, and parallel to, the trend of shorelines representing four general time periods (1800s, 1920s-1930s, 1970s, and 1998-2002). Using DSAS, transects were generated with a spacing of 50m and transect-shoreline intersection points were saved to a separate layer. Transects were manually eliminated to prevent calculation of rates in areas where less than four shorelines were intersected. Long-term rates of shoreline change, in units of m/yr, were calculated at each transect using linear regression applied to all four shoreline positions from the earliest (1800s) to the most recent (derived from lidar). Linear regression was selected because it has been shown to be the most statistically robust quantitative method when a limited number of shorelines are available and it is the most commonly applied statistical technique for expressing shoreline movement and estimating rates of change. Uncertainties for the long-term rates are also reported in units of m/yr and represent a 90% confidence interval for the slope of the regression line. This means with 90% statistical confidence that the true rate of shoreline change falls within the range defined by the reported value plus or minus the error value. The variability around the trend reflects both measurement and sampling errors. Short-term rates of shoreline change, in units of m/yr, were calculated using the endpoint method comparing the 1970s and most recent shoreline positions. Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Center for Coastal and Watershed Studies 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 Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Eastern 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: 19 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: tx_baseline 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: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 10 Attribute: Attribute_Label: TYPE Attribute_Definition: Type of feature. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Shoreline Enumerated_Domain_Value_Definition: Vector shoreline. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Enumerated_Domain: Enumerated_Domain_Value: Baseline Enumerated_Domain_Value_Definition: Vector baseline. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: DATE_ Attribute_Definition: Year constructed. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 01/01/2002 Enumerated_Domain_Value_Definition: Feature constructed in 2002. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey 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: SOURCE Attribute_Definition: Agency that provided feature or data used to create feature. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: USGS Enumerated_Domain_Value_Definition: United States Geological Survey Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: ACCURACY Attribute_Definition: Position accuracy of feature. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 Enumerated_Domain_Value_Definition: The accuracy is not given or is not known. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Attribute_Units_of_Measure: meters (m) Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Center for Coastal and Watershed Studies 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 Hours_of_Service: Monday through Friday, 8 a.m. to 5 p.m., Eastern Standard Time Resource_Description: USGS Open-File Report 2004-1089 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_Specification: Seven files comprise the ArcView shapefile: .dbf, .shp, .shx, .prj, .avl, .sbx, .sbn Transfer_Size: 0.026 Metadata_Reference_Information: Metadata_Date: 20040406 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