HSHYDD - Seamless USGS Hydrography for the Grand Strand region of South Carolina (1:24000: Polygon)

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Frequently-anticipated questions:

What does this data set describe?

Title:
HSHYDD - Seamless USGS Hydrography for the Grand Strand region of South Carolina (1:24000: Polygon)
Abstract:
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, HSHYDD - Seamless USGS Hydrography for the Grand Strand region of South Carolina (1:24000: Polygon): Open-File Report 2005-1346, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    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., 2007, 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:

    Other_Citation_Details: 1 DVD-ROM

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -79.499664
    East_Bounding_Coordinate: -78.499725
    North_Bounding_Coordinate: 34.125023
    South_Bounding_Coordinate: 33.125051

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1346/images/gshydd.jpg> (JPEG)
    Image of the hydrography shapefile

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

    Calendar_Date: 2003
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: vector digital data

  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):

      • G-polygon (9535)

    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 0.000008. Longitudes are given to the nearest 0.000008. 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?

    gshydd
    ESRI Shapefile (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    AREA
    Area of the polygon in native units (Source: USGS)

    Range of values
    Minimum:0
    Maximum:73001569.213
    Units:meters
    Resolution:.001

    PERIMETER
    Perimeter of polygon in native units (Source: USGS)

    Range of values
    Minimum:0
    Maximum:146471.524
    Units:meters
    Resolution:.001

    PIREW90HYD
    Internal ID (Source: USGS)

    Range of values
    Minimum:0
    Maximum:410
    Units:integer count
    Resolution:1

    HYPMAJOR1
    Major codes denote hydrography as the major feature category to which a line element belongs (as opposed to property boundaries, roads, etc within DLGs). (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    50Identifies the major category to which element belongs (hydrography)

    HYPMINOR1
    Minor codes assigned to any single hydrography area element. (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    111Marsh, wetland,swamp,bog
    116Bays, estuaries, gulfs, oceans, seas
    412Stream
    414Ditch or canal
    421Lake or pond

    HYPMAJOR2
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    50Identifies the major category to which element belongs (hydrography)
    59coincident feature

    HYPMINOR2
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    7unknown
    610Intermittent
    616Navigable transportation
    619interpolated elevation

    HYPMAJOR3
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    50Identifies the major category to which element belongs (hydrography)
    51water surface elevation, whole feet, 9999 or less

    HYPMINOR3
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    10unknown
    625unkonwn

    HYPMAJOR4
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    51water surface elevation, whole feet, 9999 or less

    HYPMINOR4
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown
    10unkowwn
    32open water reach flag
    42terminal stream id
    47terminal base level code

    HYPMAJOR5
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown

    HYPMINOR5
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown

    HYPMAJOR6
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown

    HYPMINOR6
    Internal ID (Source: USGS)

    ValueDefinition
    -99999Not applicable or unclassified water body
    0unknown

    HYPNAME
    The water feature name. (Source: USGS)

    Character string

    HYPTYPE
    The type of water feature. (Source: USGS)

    Character string

    Entity_and_Attribute_Overview:
    The National Hydrography Dataset is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of water, paths through which water flows, and related entities. The information encoded about features includes classification by type, other characteristics, a unique common identifier, the feature length or area, and (rarely) elevation of the surface of water pools and a description of the stage of the elevation. For reaches, encoded information includes a reach code, the date the reach code was assigned, a unique common identifier, the reach length or area, and, for transport reaches, the stream level. Names and their identifiers in the Geographic Names Information System, are assigned to reaches or, if no reach is available, to features. The data also contain relations among reaches that encode the direction of water flow, metadata, and information that supports the exchange of future updates and improvements to the data. The names and definitions of all feature types, characteristics, and values are in U.S. Geological Survey, 1999, Standards for National Hydrography Dataset: Reston, Virginia, U.S. Geological Survey. The document is available online through <http://ncgmp.usgs.gov/ncgmpstandards/>. Information about tables and fields in the data are available from the user documentation for the National Hydrography Dataset.
    Entity_and_Attribute_Detail_Citation:
    The names and definitions of all feature types, characteristics, and values are in U.S. Geological Survey, 1999, Standards for National Hydrography Dataset: Reston, Virginia, U.S. Geological Survey. The document is available online through <http://ncgmp.usgs.gov/ncgmpstandards/>. Information about tables and fields in the data is available from the user documentation for the National Hydrography Dataset at <http://nhd.usgs.gov>. The National Map - Hydrography Fact Sheet is also available at: <http://erg.usgs.gov/isb/pubs/factsheets/fs06002.html>.

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?

    Wayne Baldwin
    United States Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

Why was the data set created?

This data set is a compilation of USGS Hydrography data (7.5 Minute Quadrangle (1:24000) - digital line graphics) that have been modified to form a seamless background layer within the Grand Strand study area. Unmodified versions of the individual quads can be downloaded free of charge from the South Carolina Department of Natural Resources GIS Data Clearinghouse - <http://www.dnr.sc.gov/GIS/gisdownload.html>

How was the data set created?

  1. From what previous works were the data drawn?

    USGS Hydrography, 2003 (source 1 of 1)
    U.S. Geological Survey, 2003, 1:24,000 7.5 Minute Quadrangle Topographic Map Series: U.S. Geological Survey, Reston, Virginia.

    Online Links:

    Type_of_Source_Media: digital tape media
    Source_Scale_Denominator: 24000
    Source_Contribution:
    U.S. Geological Survey or another mapping agency in cooperation with USGS.

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

    Date: 2003 (process 1 of 1)
    Individual 7.5 minute Hydrography DLG quadrangles were dissolved by attribute to remove rectilinear edges, and produce a seamless background layer for the Grand Strand region.

    Person who carried out this activity:

    Wayne Baldwin
    United States Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

    Data sources used in this process:
    • USGS Hydrography, 2003

    Data sources produced in this process:

    • gshydd.shp

  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?

    All attributes were checked in a consistent manner

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

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

    All data included in the original 7.5 minute quadrangle DLGs are included in this data set.

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

    No additional checks for topological consistency were performed on this 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
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.

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

    Wayne Baldwin
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

  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?

Dates:
Last modified: 26-Sep-2006
Metadata author:
Wayne Baldwin
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov

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

Generated by mp version 2.9.2 on Tue Mar 06 15:39:45 2007