GLORIA_COVERAGE_NAD83.SHP - Gulf of Mexico GLORIA sidescan sonar coverage

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Frequently-anticipated questions:

What does this data set describe?

Title:
GLORIA_COVERAGE_NAD83.SHP - Gulf of Mexico GLORIA sidescan sonar coverage
Abstract:
This GIS overlay is a component of the U.S. Geological Survey, Woods Hole Science Center's, Gulf of Mexico ArcView GIS database. The Gulf of Mexico GIS database is intended to organize and display USGS held data and provide on-line (WWW) access to the data and/or metadata.
Supplemental_Information:
The coverage of the Gulf of Mexico GLORIA data was taken from an image, Gulf_mex.rmp, available on the U.S. Geological Survey Digital Data Series DDS-15 CD-ROM. The image was created from the geologic interpretations of the GLORIA images that may be found in the paper atlases at a scale of 1:500,000 and are referenced as U.S. Geological Survey Miscellaneous Investigations Series I-1864-A,B (1987). The individual segments of the geologic interpretation were combined into a single segment to represent the full coverage.
  1. How should this data set be cited?

    Twichell, David, 2005, GLORIA_COVERAGE_NAD83.SHP - Gulf of Mexico GLORIA sidescan sonar coverage: Open-File Report 2005-1071, 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.

    D.C., Twichell, V.A., Cross, Paskevich, V.F., Hutchinson, D.R., Winters, W.J., and Hart, P.E., 2005, GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey.

    Online Links:

    Other_Citation_Details: 1 DVD-ROM

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -95.799410
    East_Bounding_Coordinate: -82.041671
    North_Bounding_Coordinate: 29.210833
    South_Bounding_Coordinate: 23.741338

  3. What does it look like?

    <http://pubs.usgs.gov/of/2005/1071/data/sidescan/interpretation/gloria/gloria_coverage_nad83.gif> (GIF)
    Overview image showing the extent and coverage of the data layer.
    <http://pubs.usgs.gov/of/2005/1071/data/sidescan/interpretation/gloria/gloria_coverage_nad83-thumb.gif> (GIF)
    Thumbnail image showing the extent and coverage of the data layer.

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

    Calendar_Date: 23-Nov-1987
    Currentness_Reference: publication date

  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):

      • GT-polygon composed of chains (1)

    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 0.005. Longitudes are given to the nearest 0.005. 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.

  7. How does the data set describe geographic features?

    gloria_coverage_nad83
    Shapefile Attribute Table (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 polygon in native units (Source: Software computed)

    Range of values
    Minimum:36.575
    Maximum:36.575
    Resolution:.001

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?

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This GIS data layer data layer contains the coverage of the Gulf of Mexico GLORIA data.

How was the data set created?

  1. From what previous works were the data drawn?

    gulf_mex.rmp (source 1 of 2)
    Twichell, D.C., and Polloni, C.F., 1993, CD-ROM Atlas of the Deepwater Parts of the U. S. Exclusive Economic Zone in the Atlantic Ocean, the Gulf of Mexico, and the Eastern Caribbean Sea: Digital Data Series DDS-15, U.S. Geological Survey, Office of Marine Geology, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 1 CD-ROM
    This is part of the following larger work.

    EEZ Scan 1985 Scientific Staff, 1987, U. S. Exclusive Economic Zone, Gulf of Mexico and eastern Caribbean areas: U.S. Geological Survey Miscellaneous Investigations I-1864-A, U.S. Geological Survey, Office of Marine Geology, U.S. Geological Survey, Reston, VA.

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 5000000
    Source_Contribution:
    The geologic interpretation image, GUlf_mex.rmp, was taken from DDS-15 and used to create vector coverages for ARC/INFO and ArcView.

    The Geologic interpretation of the GLORIA images found in the atlas, I-1864-A,B, was digitized and Arc/INFO coverages created. Those coverages were combined to create a single, pseudo-color coded interpretive map/image for DDS-15. Unfortunately, the coverages were subsequently lost. Rather than redigitize the mosaics, the decision was made to recreate the coverages based on the image from DDS-15. The union of all the polugons in the geologic interpretation were combined to create this GLORIA coverage shapefile.

    gulf_mex.rmp (source 2 of 2)
    EEZ Scan 1985 Scientific Staff, 1987, Atlas of the U.S. Exclusive Economic Zone, Gulf of Mexico and eastern Caribbean areas: Miscellaneous Investigations I-1864-A,B, U.S. Geological Survey, Office of Marine Geology, U.S. Geological Survey, Reston, VA.

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 500000
    Source_Contribution:
    The geologic interpretation image, Gulf_mex.rmp, was taken from DDS-15 and used to create vector coverages for ARC/INFO and ArcView. The individual polugons within the geologic interpretaiton were then combined to create this GLORIA coverage shapefile.

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

    Date: 19-Oct-1998 (process 1 of 7)
    The geologic interpretation image was taken from the CD-ROM DDS-15 and registered to a 250 meter, georeferenced GLORIA image for the entire Gulf of Mexico. When the geologic interpretation image was registered, the image was then rasterized to create vector outlines.

    Person who carried out this activity:

    Valerie Paskevich
    U.S. Geological Survey
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x 2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov

    Data sources used in this process:
    • DDS-15

    Data sources produced in this process:

    • vecsegs1

    Date: 10-Nov-1998 (process 2 of 7)
    Due to the stepping in the image found at the geologic boundaries, the resulting vectors showed the same stepping. The vector information was editted to smooth the lines. The editted and smoothed vector segments were exported in ARC/INFO export format.

    Person who carried out this activity:

    Valerie Paskevich
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x 2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.ogv

    Data sources used in this process:
    • vecsegs1

    Data sources produced in this process:

    • geology.e00

    Date: 13-Nov-1998 (process 3 of 7)
    The ARC export file, geology.e00, was imported to ARC as goverage geology and the polygon coverage was built.

    Person who carried out this activity:

    Valerie Paskevich
    U.S. Geological Survey
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x 2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov

    Data sources used in this process:
    • geology.e00

    Data sources produced in this process:

    • geology.pat

    Date: 13-Nov-1998 (process 4 of 7)
    The ARC polygon coverage, geology.pat, was exported as an ArcVIew shapefile, geology.

    Person who carried out this activity:

    Valerie Paskevich
    U.S. Geological Survey
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x 2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov

    Data sources used in this process:
    • geology.pat

    Data sources produced in this process:

    • geology.shp
    • geology.dbf
    • geology.shx

    Date: 16-Nov-1998 (process 5 of 7)
    The ArcView shapefile, geology, was brought into ArcView for final viewing and verification. No further editting or changes were needed to the shapefile. However, the geology.dbf file was modified to add the fields Geocode, Description, and GeoAbrv.

    Person who carried out this activity:

    Valerie Paskevich
    U.S. Geological Survey
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x 2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@uags.gov

    Data sources used in this process:
    • geology.shp
    • geology.dbf
    • geology.shx

    Data sources produced in this process:

    • geology.shp
    • geology.dbf
    • geology.shx

    Date: 26-May-2004 (process 6 of 7)
    All of the polygons within the ArcVIew shapefile, geology, were combined into a single polygon to show the complete coverage of the GLORIA sidescan sonar survey.

    Person who carried out this activity:

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

    Data sources used in this process:
    • geology.shp
    • geology.dbf
    • geology.shx

    Data sources produced in this process:

    • gloria_coverage.shp
    • gloria_coverage.dbf
    • gloria_coverage.shx

    (process 7 of 7)
    Dataset reprojected from NAD27 to NAD83 using Arctoolbox 9.0.

    Data sources used in this process:

    • gloria_coverage.shp

    Data sources produced in this process:

    • gloria_coverage_nad83.shp

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

    Paskevich, V., 2000, Gulf of Mexico GLORIA sidescan sonar geologic interpretation: ArcView data coverages: Open-File Report 00-019, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Twichell, D.C., and Polloni, C.F., 1993, CD-ROM Atlas of the Deepwater Parts of the US Exclusive Economic Zone in the Atlantic Ocean, the Gulf of Mexico, and the Eastern Caribbean Sea: U.S. Geological Survey Digital Data Series DDS-15, U.S. Geolgoical Survey, Office of Marine Geology, U.S. Geological Survey, Reston, VA.

    Online Links:

    EEZ-SCAN 85 Scientific Staff, 1987, Atlas of the US Exclusive Economic Zone GUlf of Mexico and Eastern Caribbean Areas: Miscellaneous Investigations Series I-1864-A,B, U.S. Geological Survey, Office of Marine Geology, U.S. Geological Survey, Reston, VA.

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

  1. How well have the observations been checked?

  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?

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

    The data layer has been checked for topological consisitency (Clean and Build completed).

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)

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@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 this data set has 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.

  4. How can I download or order the data?

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

    The 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: 13-Dec-2005
Metadata author:
U.S. Geological Survey
c/o David Twichell
Oceanographer
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov

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

Generated by mp version 2.8.6 on Tue Dec 13 13:25:11 2005