RIDGE_CRESTS - Ridge Crests within the inner shelf of Long Bay, South Carolina (Polyline)

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Frequently-anticipated questions:

What does this data set describe?

RIDGE_CRESTS - Ridge Crests within the inner shelf of Long Bay, South Carolina (Polyline)
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.
  1. How should this data set be cited?

    U.S. Geological Survey, 2007, RIDGE_CRESTS - Ridge Crests within the inner shelf of Long Bay, South Carolina (Polyline): Open-Fil 2005-1346.

    Online Links:

    This is part of the following larger work.

    Baldwin, W.E., Denny, J.F., Schwab, W.C., Gayes, P.T., Morton, R.A., and Driscoll, N.W., 2006, Geologic Framework Studies of South Carolina's Long Bay from Little River Inlet to Winyah Bay, 1999-2003; geospatial data release: Open-File Report 2005-1346, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -79.156078
    East_Bounding_Coordinate: -78.616654
    North_Bounding_Coordinate: 33.786952
    South_Bounding_Coordinate: 33.236417

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1346/images/ridge_crests.jpg> (JPEG)
    Image of ridge crests within the inner shelf of Long Bay

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2006
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Polylines

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • String (127)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    ESRI polyline shapefile (Source: ESRI)

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Ridge field name (Source: USGS)

    Cape Romain Shoal ComplexRidge Location
    LBS ShoalRidge Location
    Mottled BSRidge Location
    Murrells InletRidge Location

    Ridge width in kilometers classified in half meter intervals (Source: USGS)

    Character string

    Ridge length in meters (Source: USGS)

    Range of values

    Ridge height in meters (Source: USGS)

    Character string

    Ridge azimuth, clockwise in degrees from north (Source: USGS)

    Range of values
    Units:degrees, clockwise from north

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Jane Denny
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)

Why was the data set created?

This data set contains polylines that outline the crests of low-relief ridges mapped within the inner shelf of Long Bay.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 2004 (process 1 of 1)
    Interpretations of the rideg crests offshore of the Grand Strand, SC were dervied from swath bathymetry and seismic-reflection profiles. Crests were hand digitized within ArcGIS 9.0 at a scale of approximately 1:75000.

    Person who carried out this activity:

    Jane Denny
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Interpretations are based on swath bathymetry and seismic-reflection profiles.

  2. How accurate are the geographic locations?

    Interpretation of ridge crests was derived from swath bathymetry and seismic-reflection data. The accuracy is dependent on the source data and is assumed to be that of DGPS (2 m).

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Ridge crests were digitized based on swath bathymetric data collected offshore of Myrtle Beach, SC 1999-2003. No additions or modifications are planned.

  5. How consistent are the relationships among the observations, including topology?

    No additional checks for topological consistency were performed on the data.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
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.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508-548-8700 (voice)
    508-457-2310 (FAX)

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Although all data have been used by the 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.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Last modified: 23-Jan-2007
Metadata author:
Jane Denny
U.S. Geological Survey
384 Woods Hole Road
Woods Hole, MA 02543-1598

508-548-8700 x2310 (voice)
508-457-2310 (FAX)

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.2 on Wed Mar 07 13:19:25 2007