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Holocene isopach depth

Metadata also available as - [Outline] - [Parseable text] - [DIF]

Frequently-anticipated questions:

What does this data set describe?

Title: Holocene isopach depth
Abstract:
The U.S. Geological Survey, in cooperation with the University of South Florida and Eckerd College, completed a bathymetric, sidescan sonar, high-resolution seismic-reflection, and surface sediment sampling survey of the inner shelf environment along the western Florida coast. The survey area extends 15km from Sarasota Point to Buttonwood Harbor. This study is part of a larger program initiated by the U.S. Geological Survey to map the geologic framework and monitor the modern processes that affect the western Florida coastal zone. This portion of the project included a reconnaissance high-resolution seismic and side-scan sonar surveys of the entire study area, detailed mapping to identify patterns of hard grounds and sediment cover, and coring of sediments to document historical development of the inner shelf and coastal system.
  1. How should this data set be cited?

    (comp.), Dave Twichell , 19990602, Holocene isopach depth: U.S. Geological Survey Open-File Report 99-396, U.S. Geological Survey, Woods Hole, MA.

    This is part of the following larger work.

    David C. Twichell, Jr. (comp.), and (comp.), Valerie Paskevich , 1999, Bathymetry, Sidescan Sonar Image, Surface Sediments, and Surficial Geologic map of the Inner Shelf off Sarasota, Florida: Preliminary discussion and database release: U.S. Geological Survey Open-File Report 99-396, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -82.7194
    East_Bounding_Coordinate: -82.5653
    North_Bounding_Coordinate: 27.3668
    South_Bounding_Coordinate: 27.2155

  3. What does it look like?

    <http://pubs.usgs.gov/openfile/of99-396/htmldocs/figures/fig1.jpg> (JPG)
    Grayscale map of the study area and surrounding region, 982x715 pixels, 102k bytes.
    <http://pubs.usgs.gov/openfile/of99-396/htmldocs/images/covrgs/holocene.gif> (GIF)
    These data plotted over integrated sidescan and aerial photograph image, 608x682 pixels, 141.4k bytes

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

    Beginning_Date: 02-May-1994
    Ending_Date: 08-May-1994
    Currentness_Reference: Ground Condition

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

  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 (26)

    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 .00002. Longitudes are given to the nearest .00002. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.

  7. How does the data set describe geographic features?

    holocene.dbf
    Shapefile Attribute Table

    Code
    A numeric code assigned to the polygon that may be used for color assignments. The codes relate to the holocene isopach depth assigned to the polygons by the researcher drawing the interpretation.

    ValueDefinition
    10-1m
    21-2m
    3
    2m

    Label
    Label is a text field that is assigned as a description of the code assigned to the polygon that may be used as a legend text label.

    ValueDefinition
    0-1mcode 1
    1-2mcode 2
    >2mcode 3

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?

    U. S. Geological Survey
    c/o Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02532
    USA

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

Why was the data set created?

This GIS overlay is a component of the Sarasota, Florida ArcView GIS database and contains the researcher's interpretation of theHolocene isopach depth thickness for the study area.

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: 14-Jun-1999 (process 1 of 1)
    The interpretation was drawn over the sidescan sonar mosaic utilizing the PCI remote sensing software Imageworks. The completed mosaic was georeferenced to the UTM zone 17. Using information from the collected seismic data, the interpretation was interactively drawn over the image as a series of vector polygons and saved in the PCI image database file. The saved graphic was exported from PCI as an ArcView shapefile and imported to the Sarasota ArcView GIS database.

    Person who carried out this activity:

    Dave 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

  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?

  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?

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:
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.

  1. Who distributes the data set? (Distributor 1 of 2)

    U. S. Geological Survey
    c/o Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543
    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?

    holocene isopach depth coverage for Sarasota, FL study area

  3. What legal disclaimers am I supposed to read?

    Although this derived data set has 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.

  4. How can I download or order the data?

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

    Holocene Isopach depth for the study area is available in ArcView shapefile format. The user must have ArcView to read and process the data file or another GIS application package capable of importing the data.

  1. Who distributes the data set? (Distributor 2 of 2)

    USGS Information Services
    Box 25286 Denver Federal Center
    Denver, CO 80225
    USA

    1-888-ASK-USGS (voice)
    303-202-4693 (FAX)
    ask@usgs.gov

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

    USGS Open-File Report 99-396 data for bathy2

  3. What legal disclaimers am I supposed to read?

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 15-Jun-1999
Metadata author:
U. S. Geological Survey
c/o Valerie Paskevich
Computer Specialist
384 Woods Hole Rd.
Woods Hole, MA 02543
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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Page Last Modified: Monday, 10-Nov-2008 12:20:10 EST

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