Long-Term Shoreline Change Rates for Texas Generated at a 50m Transect Spacing, 1850-2001

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Robert Morton
Originator: Tara Miller
Publication_Date: 2004
Title:
Long-Term Shoreline Change Rates for Texas Generated at a 50m Transect Spacing, 1850-2001
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: -97.399265
East_Bounding_Coordinate: -93.905885
North_Bounding_Coordinate: 29.700235
South_Bounding_Coordinate: 25.955955
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: 10640

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_transects_lt
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: Transect feature number.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 2131
Attribute:
Attribute_Label: BASELNID
Attribute_Definition: Baseline segment from which the transect is generated.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 9
Attribute:
Attribute_Label: TIMESTMP
Attribute_Definition: Date and time the rate calculation was generated.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Unrepresentable_Domain: A date and time stamp that is automatically generated by DSAS.
Attribute:
Attribute_Label: AUTOGEN
Attribute_Definition:
Indicates whether the transect was autogenerated or manually generated.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Transect was automatically generated by DSAS.
Enumerated_Domain_Value_Definition_Source: DSAS
Enumerated_Domain:
Enumerated_Domain_Value: No value given
Enumerated_Domain_Value_Definition: Transect was manually generated or edited by user.
Enumerated_Domain_Value_Definition_Source: DSAS
Attribute:
Attribute_Label: STARTX
Attribute_Definition: X starting position of the transect in UTM meters.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 207119
Range_Domain_Maximum: 793334
Attribute:
Attribute_Label: STARTY
Attribute_Definition: Y starting position of the transect in UTM meters.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2872286
Range_Domain_Maximum: 3282949
Attribute:
Attribute_Label: ENDX
Attribute_Definition: X ending position of the transect in UTM meters.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 205937
Range_Domain_Maximum: 792247
Attribute:
Attribute_Label: ENDY
Attribute_Definition: Y ending position of the transect in UTM meters.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2872093
Range_Domain_Maximum: 3285965
Attribute:
Attribute_Label: AZIMUTH
Attribute_Definition: The transect's horizontal angular distance from north.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 360
Attribute:
Attribute_Label: POINTCNT
Attribute_Definition: Number of shoreline intersections in the rate calculation.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4
Range_Domain_Maximum: 4
Attribute:
Attribute_Label: LRR
Attribute_Definition: Linear regression rate.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -9.2
Range_Domain_Maximum: 14.9
Attribute_Units_of_Measure: meters per year (m/yr)
Attribute:
Attribute_Label: R2_LRR
Attribute_Definition: Correlation coefficient (r^2).
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1
Attribute:
Attribute_Label: SE_LRR
Attribute_Definition: Standard error of the estimate.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0
Range_Domain_Maximum: 1074.6
Attribute_Units_of_Measure: meters (m)
Attribute:
Attribute_Label: CI90_LRR
Attribute_Definition: Standard error of the slope at a 90% confidence level.
Attribute_Definition_Source: DSAS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.0
Range_Domain_Maximum: 78.3
Attribute_Units_of_Measure: meters per year (m/yr)

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: <filename>.dbf, <filename>.shp, <filename>.shx, <filename>.prj, <filename>.avl, <filename>.sbx, <filename>.sbn
Transfer_Size: 2.902

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

Generated by mp version 2.7.33 on Tue Apr 06 14:20:55 2004