1956 shoreline, Baffin Bay, Texas

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: University of Texas at Austin Bureau of Economic Geology
Publication_Date: 2002
Title: 1956 shoreline, Baffin Bay, Texas
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: <http://www.beg.utexas.edu/coastal/download.htm#iiihsd>
Description:
Abstract:
This document describes a shoreline vector file that was produced by the University of Texas at Austin Bureau of Economic Geology (Austin, TX). This file contains the mapped 1956 Baffin Bay, Texas Gulf of Mexico coast. Funding for this project was provided by the Texas General Land Office. The shoreline was created by digitizing a line interpreted from a series of georectified 1956 aerial photographs. A georectified aerial photograph is a raster image of a vertical aerial photograph in which distortion has been removed and georeferencing information has been added. The images have a resolution of 1000 ppi and are in greyscale. They are projected in Universal Transverse Mercator (UTM) in meters on the North American Datum of 1983 (NAD83). The images were processed in ER Mapper format (.ers) and then converted to GeoTIFF.
Purpose:
The shoreline file described in this document was created to be used in shoreline change analyses.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19560317
Time_of_Day: unknown
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -97.772771
East_Bounding_Coordinate: -97.400641
North_Bounding_Coordinate: 27.431365
South_Bounding_Coordinate: 27.227661
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: shapefile
Theme_Keyword: vector file
Place:
Place_Keyword: Texas
Place_Keyword: Texas gulf coast
Place_Keyword: Baffin Bay
Place_Keyword: Gulf of Mexico
Temporal:
Temporal_Keyword: 1956
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jim Gibeaut
Contact_Organization: University of Texas at Austin Bureau of Economic Geology
Contact_Position: Research Associate
Contact_Address:
Address_Type: mailing address
Address: University Station Box X
City: Austin
State_or_Province: TX
Postal_Code: 78713
Country: USA
Contact_Voice_Telephone: (512) 471-0344
Contact_Electronic_Mail_Address: jim.gibeaut@beg.utexas.edu
Data_Set_Credit:
Bill White and Rachel Waldinger University of Texas at Austin Bureau of Economic Geology
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.2.0.700

Data_Quality_Information:
Completeness_Report:
This file contains the shoreline of the entire Baffin Bay, mapped at a scale of 1:5000
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
This shoreline was interpreted from a georectified aerial photograph. Georectified aerial photographs are based on USGS Digital Orthophoto Quads (DOQs):The DOQ horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. These inputs consist of the digital elevation model (DEM), aerotriangulation control and methods, the photo source camera calibration, scanner calibration, and aerial photographs that meet National Aerial Photography Program (NAPP) standards. The vertical accuracy of all DEMs are equivalent to or better than a Level 1 or 2 DEM, with a root mean square error (RMSE) of no greater than 7.0 meters. Field control is acquired by third order class 1 or better survey methods sufficiently spaced to meet National Map Accuracy Standards (NMAS) for 1:12,000-scale products. Aerial cameras have current certification from the USGS, National Mapping Division, Optical Science Laboratory. Test calibration scans are performed on all source photography scanners. Adjacent DOQs, when displayed together in a common planimetric coordinate system, may exhibit slight positional discrepancies across common DOQ boundaries. Linear features, such as streets, may not be continuous. These edge mismatches, however, still conform to positional horizontal accuracy within the NMAS. The Horizontal_Positional_Accuracy Value (see below) is an root mean square error (RMSE) of image positions to ground coordinates as determined by the orthorectification software used. (Source: Metadata for USGS DOQs, 1995)
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: United States Department of Agriculture
Title: 1956 aerial photographs of Baffin Bay, Texas
Source_Scale_Denominator: 20,000
Type_of_Source_Media: black and white aerial photograph print
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19560317
Time_of_Day: unknown
Source_Currentness_Reference: ground condition
Source_Contribution: United States Department of Agriculture
Process_Step:
Process_Description:
The shoreline was interpreted as the contact between wet and dry sand. Lines were digitized from georectified aerial photographs at a scale of 1:5,000.

Georectification of the aerial photographs involves the establishment of ground control points that link each image to its corresponding aerial coverage on a 1995 USGS digital orthophoto quarter quad (DOQQ). Points are chosen on the image that can be matched to points on the DOQQ. Road intersections and other cultural features are preferred as reference points rather than natural features. However, in many cases cultural features are lacking and features such as trees, shrubs, and the edges of water bodies are used. Where possible, points are evenly spaced across the image surface, with special emphasis on the edges of the image, and on areas near to the shoreline. The number of ground control points used for each image varies depending on how distorted the image is, and on the availability of suitable reference features. The average range is approximately 30 to 60 points per image. Once all the ground control points have been established, the image is rectified. The images underwent a delaunay triangulation algorithm, in which each ground control point became a vertex in a mesh of triangle. A single polynomial warp was applied to each triangle in order to correct for local distortion. Once the rectification was complete, the image was made semi-transparent and overlain on the DOQQ. In some areas a "double image" would occur, indicating that either more ground control points were needed, or that one or more existing ground control points had been placed incorrectly. In these cases, images were reprocessed to correct any remaining distortion.

Process_Date: 2002
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Rachel Waldinger
Contact_Organization: University of Texas Bureau of Economic Geology
Contact_Position: Research Scientist Associate
Contact_Address:
Address_Type: mailing address
Address: University Station Box X
City: Austin
State_or_Province: TX
Postal_Code: 78713
Country: UAS
Contact_Voice_Telephone: (512) 475-9551
Contact_Electronic_Mail_Address: rachel.waldinger@beg.utexas.edu
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: C:\DOCUME~1\WALDIN~1\LOCALS~1\Temp\xml8.tmp
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: C:\DOCUME~1\WALDIN~1\LOCALS~1\Temp\xml11.tmp
Cloud_Cover: none

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: 144

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 14
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -99.000000
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: 0.000064
Ordinate_Resolution: 0.000064
Planar_Distance_Units: meters
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: baffin_56_sh
Entity_Type_Definition: 1956 shoreline of Baffin Bay, Texas
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
Overview_Description:

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jim Gibeaut
Contact_Organization: University of Texas at Austin Bureau of Economic Geology
Contact_Position: Research Associate
Contact_Address:
Address_Type: mailing address
Address: University Station Box X
City: Austin
State_or_Province: TX
Postal_Code: 78713
Country: USA
Contact_Voice_Telephone: (512) 471-0344
Contact_Electronic_Mail_Address: jim.gibeaut@beg.utexas.edu
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.034
Fees: Free to public
Ordering_Instructions:
Download from website:

<http://www.beg.utexas.edu/coastal/download.htm#iiihsd>

Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19560317
Time_of_Day: unknown

Metadata_Reference_Information:
Metadata_Date: 20030306
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: University of Texas Bureau of Economic Geology
Contact_Person: Rachel Waldinger
Contact_Position: Research Scientist Associate
Contact_Address:
Address_Type: mailing address
City: University Station Box X
State_or_Province: Austin
Postal_Code: TX
Country: USA
Contact_Voice_Telephone: (512) 475-9551
Contact_Electronic_Mail_Address: rachel.waldinger@beg.utexas.edu
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
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Generated by mp version 2.7.3 on Thu Mar 06 12:52:09 2003