U.S. Geological Survey
2007
Elevation of the regional transgressive unconformity underlying the inner shelf of Long Bay (Grid; transgr_grd)
1.0
raster digital data
Open-File Report
2005-1346
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr20051346
http://pubs.usgs.gov/of/2005/1346/arcgis/seismic_srf/transgr_grd.zip
http://pubs.usgs.gov/of/2005/1346/html/gis.html#seismic_srf
Baldwin, W.E.
Denny, J.F.
Schwab, W.C.
Gayes, P.T.
Morton, R.A.
Driscoll, N.W.
2007
Geologic Framework Studies of South Carolina's Long Bay from Little River Inlet to Winyah Bay, 1999-2003; geospatial data release
1.0
Open-File Report
2005-1346
Reston, VA
U.S. Geological Survey
1 DVD-ROM
http://pubs.usgs.gov/of/2005/1346/
In 1999, the U.S. Geological Survey (USGS), in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. The primary objectives of this research effort are: 1) to provide a regional synthesis of the shallow geologic framework underlying the coastal upland, shoreface and inner continental shelf, and define its role in coastal evolution and modern beach behavior; 2) to identify and model the physical processes affecting coastal ocean circulation and sediment transport, and to define their role in shaping the modern shoreline; and 3) to identify sediment sources and transport pathways; leading to construction of a regional sediment budget.
This data set contains a surface depicting the elevation of the regional transgressive unconformity underlying the inner shelf of Long Bay, offshore of the South Carolina Grand Strand. Chirp seismic data collected with Benthos SIS-1000 and Edgetech SB-512 acquisition systems were processed using SIOSEIS (Scripps Institute of Oceanography) and Seismic Unix (Colorado School of Mines) to produce segy files and jpg images of the profiles. Data were then imported into Landmark SeisWorks, a digital seismic interpretation package, where the sea floor and underlying transgressive surface were interpreted and digitized. The isopach between these horizons was exported at every 50th shot as xyz points, and imported to ArcGIS for interpolation into a 10-m raster grid. The isopach grid was then subtracted from a seafloor bathymetry grid (bathy_grd) to approximate the proper elevation of the transgressive unconformity beneath the sea floor.
In 1999, the USGS, in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. The primary objectives of this research effort are: 1) to provide a regional synthesis of the shallow geologic framework underlying the coastal upland, shoreface and inner continental shelf, and define its role in coastal evolution and modern beach behavior; 2) to identify and model the physical processes affecting coastal ocean circulation and sediment transport, and to define their role in shaping the modern shoreline; and 3) to identify sediment sources and transport pathways; leading to construction of a regional sediment budget.
1999
2003
ground condition
None planned
-79.158619
-78.514899
33.855993
33.188888
USGS Metadata Identifier
USGS:113c295f-41d3-45a0-957b-2cb1fe04c939
None
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Science Center
WHSC
Seafloor
Marine Geology
Seismic Reflection Profile
Benthos SIS-1000
Edgetech SB-512
Chirp
ArcGIS Raster
transgressive unconformity
elevation
interpretation
ISO 19115 Topic Category
oceans
geoscientificInformation
USGS Thesaurus
scientific interpretation
geologic structure
geospatial datasets
marine geology
marine geophysics
unconformities
None
South Carolina
Grand Strand
Long Bay
North Myrtle Beach
Myrtle Beach
Surfside
Garden City
Pawleys Island
Waites Island
Southeast United States
United States
Atlantic Ocean
None
These data are NOT to be used for navigation purposes. Mariners should refer to the appropriate nautical chart.
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.
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
http://pubs.usgs.gov/of/2005/1346/images/transgr_grd.jpg
elevation of regional transgressive unconformity underlying the Long Bay inner shelf
JPEG
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350
Information unavailable from original metadata.
All available interpretations of paleochannel unconformities are included in this data set.
Navigation was by differential GPS; positional accuracy to less than 10 m
Seismic data are not corrected for tides. Thickness of Holocene surficial sediments was calculated as the distance between the seafloor and the underlying transgressive surface from interpretation of seismic reflection profiles. An isopach grid of the thickness of Holocene surficial sediments (sedthick_grd) was then subtracted from a gridded surface of seafloor bathymetry (bathy_grd) to generate a grid representing the regional elevation beneath the seafloor.
The ARCGIS raster calculator was used to subract a grid representing Holocene surficial sediments (sedthick_grd) from the regional seafloor bathymetry grid (bathy_grd) to approximate the proper elevation of the transgressive unconformity beneath the sea floor.
2003
Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The link to the data in the Identification_Information section had to be fixed. The link to the data in the Distribution_Information section had to be fixed. Modified online links to point to pubs.usgs.gov. Added the ISO 19115 Topic Category keywords. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
20160627
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
USGS Thesaurus keywords added to the keyword section.
20180720
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Crossref DOI link was added as the first link in the metadata.
20191118
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200908
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Raster
Grid Cell
728
583
1
Universal Transverse Mercator
17
0.999600
-81.000000
0.000000
500000.000000
0.000000
row and column
100.000000
100.000000
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
North American Vertical Datum of 1988
1
meters
Explicit elevation coordinate included with horizontal coordinates
Mean lower low water
0.5
meters
Explicit depth coordinate included with horizontal coordinates
Elevation of paleochannel unconformities in ESRI GRID format.
U.S. Geological Survey
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
Downloadable Data
Although all data have been used by the U.S. Geological Survey (USGS), no warranty, expressed 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
ARCG
ArcGIS9.0
ESRI Raster GRID format
zip archive containing ESRI ArcRaster grid, metadata and browse graphic
zip archive
0.2
http://pubs.usgs.gov/of/2005/1346/arcgis/seismic_srf/transgr_grd.zip
DVD-ROM
4.75
Gbytes
UDF
None
These data are available in Environmental Systems Research Institute (ESRI) GRID format. The user must have software capable of importing and processing the data file.
20240318
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
whsc_data_contact@usgs.gov
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None