Backscatter Mapping of the West Florida Shelf (Northern Region), Gulf of Mexico (NODC Accession 0001410)

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

Frequently anticipated questions:


What does this data set describe?

Title:
Backscatter Mapping of the West Florida Shelf (Northern Region), Gulf of Mexico (NODC Accession 0001410)
Abstract:
XYZ ASCII format data generated from the 2001 multibeam sonar survey of the West Florida Shelf, Gulf of Mexico. The data include high-resolution bathymetry and calibrated acoustic backscatter.
Supplemental_Information:
Information for USGS Coastal and Marine Geology related activities are online at <http://walrus.wr.usgs.gov/infobank/m/m201gm/html/m-2-01-gm.meta.html>

Resource Description: M-01-GM data set

  1. How should this data set be cited?

    United States Geological Survey (USGS), Coastal and Marine Geology (CMG), Chief Scientist (James V. Gardner), 2001, Backscatter Mapping of the West Florida Shelf (Northern Region), Gulf of Mexico (NODC Accession 0001410).

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -86.71339
    East_Bounding_Coordinate: -86.15742
    North_Bounding_Coordinate: 30.06695
    South_Bounding_Coordinate: 29.65717

  3. What does it look like?

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

    Beginning_Date: 03-Sep-2001
    Ending_Date: 12-Oct-2001
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: XYZ ASCII and ArcInfo GRID

  6. How does the data set represent geographic features?

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

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

      • Point

    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 0.00008. Longitudes are given to the nearest 0.00008. Latitude and longitude values are specified in Decimal Degrees.

      The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/.003352811.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Sample of Backscatter XYZ ASCII file Longitude, Latitude, DN Value -86.57421,30.06640,207.696 -86.57413,30.06640,206.398 -86.57405,30.06640,203.770 -86.57398,30.06640,201.170 -86.57390,30.06640,201.098 -86.57382,30.06640,202.064 -86.57374,30.06640,202.693 -86.57367,30.06640,202.720 -86.57444,30.06632,201.992
    Entity_and_Attribute_Detail_Citation: none


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?

    James V. Gardner
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Geologist
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5469 (voice)
    (650) 329-5411 (FAX)
    jvgardner@usgs.gov


Why was the data set created?

geographic information systems (GIS) or other software to display bathymetry and backscatter data of the West Florida Shelf, Gulf of Mexico.


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: 12-Oct-2001 (process 1 of 1)
    The bathymetry and backscatter data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1002 multibeam sonar system. The data are cleaned of bad navigation and depth readings. The depth readings are gridded into a common grid. The gridded data are converted to an XYZ ASCII format file (Longitude, Latitude, Attribute) and the gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command.

    Person who carried out this activity:

    James V. Gardner
    United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Geologist
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5469 (voice)
    (650) 329-5411 (FAX)
    jvgardner@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?

    Not determined.

  2. How accurate are the geographic locations?

    0.5 meters

  3. How accurate are the heights or depths?

    0.05 percent of the water depth

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

    Complete

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

    Point features present.


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:
Please recognize the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS) as the source of this information. NOAA and USGS-authored or produced data and information are in the public domain.

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

    United States Geological Survey (USGS) Information Services
    Box 25286
    Denver, CO 80225
    USA

    (888)ASK-USGS (voice)

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    These data not intended for navigational purposes. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

    Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

    NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA and NODC cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 20-Dec-2012
Metadata author:
Pete Dartnell
United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
Physical Scientist
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA 94025-3561
USA

(650) 329-5460 (voice)
(650) 329-5411 (FAX)
pdartnell@usgs.gov

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


Generated by mp version 2.9.13 on Wed Oct 22 10:42:57 2014