Building on the USGS Louisiana Barrier Island Study (Williams and others, 1992), this data layer depicts the shoreline as it stood in 1887.
The Timbalier Islands are located about 100 km south-southwest of New Orleans. This barrier island shoreline is 30 km long and extends east from Cat Island Pass to Raccoon Pass. The Timbalier Islands represent a flanking barrier island system developed from the reworking and erosion of an abandoned distributary of the Lafourche delta complex within the Mississippi River delta plain (Penland and others, 1988). Island evolution is driven by predominant longshore sediment transport and storm overwash, causing the island arc to migrate to the north and west. The present configuration of the Timbalier Islands consists of Timbalier Island to the west, Timbalier Shoal, and East Timbalier Island to the east. Timbalier Shoal, located between the two islands within Little Pass Timbalier, is a transient area of moving sand, which is subaerial for some periods of measurement. The Gulf shoreline of East Timbalier Island has been armored by a rock seawall with a second seawall constructed landward in an attempt to protect oil and gas facilities on the bayside.
In order to quantify shoreline changes since January 21, 1988, new vertical aerial mapping photography was acquired on December 9, 1996 The methods and transects used by McBride and others (1992) were used to insure data compatibility of the new measurements and analysis
Reid, Jamey M. , 2003, Shoreline for the Timbalier Islands, 1887: U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center, Woods Hole, MA.This is part of the following larger work.Online Links:
Williams, S.J., Reid, J.M., Cross, V., and Polloni, C., 2003, Coastal Erosion and Wetland Change in Louisiana: Selected USGS Products: Digital Data Series DDS-79, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center Woods Hole, MA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
University of New Orleans
c/o Paul Connor, Jr
Dept. of Geology & Geophysics, Pontchartrain Institute, CRM Bldg. Room 343
New Orleans, LA 70148
USA
(504) 280-1030 (voice)
(504) 280-4022 (FAX)
pfconnor@crl.uno.edu
To release data that was originally intended to be published in a paper atlas in a digital format.To up-date the shoreline change analysis by McBride and others (1992) and Penland and others (1998) for Timbalier Island to 1996.
Person who carried out this activity:
U.S. Geological Survey
c/o Jamey M. Reid
IT Specialist (Data Management)
Woods Hole Field Center
Woods Hole, MA 025453-1598
USA
(508) 548-8700 x 2204 (voice)
(508) 457-2310 (FAX)
jreid@usgs.gov
Person who carried out this activity:
U.S. Geological SurveyData sources used in this process:
c/o Jamey M. Reid
IT Specialist (Data Management)
Woods Hole Field Center
Woods Hole, MA 025453-1598
USA
(508) 457-2204 (voice)
(508) 457-2310 (FAX)
jreid@usgs.gov
Data sources produced in this process:
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
U.S. Geological Survey
c/o S. Jeffress Williams
Geologist
Woods Hole Field Center
Woods Hole, MA 02543-1598
USA
(508) 457-2383 (voice)
(508) 457-2310 (FAX)
jwilliams@usgs.gov
Downloadable Data
Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, express or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
Data format: | Size: 0.219 |
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U.S. Geological Survey
c/o Jamey M. Reid
IT Specialist (Data Management)
Woods Hole Field Center
Woods Hole, MA 025453-1598
USA
(508) 548-8700 x 2204 (voice)
(508) 457-2310 (FAX)
jreid@usgs.gov