Archive of Chirp Subbottom Data Collected During USGS Cruise ORGN00005, Northeastern Gulf of Mexico, 15 February - 2 March, 2000

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Frequently anticipated questions:

What does this data set describe?

Archive of Chirp Subbottom Data Collected During USGS Cruise ORGN00005, Northeastern Gulf of Mexico, 15 February - 2 March, 2000
This DVD-ROM contains digital high-resolution seismic-reflection data collected during the USGS ORGN00005 cruise. The seismic-reflection data are stored as SEG-Y standard format which can be read and manipulated by most seismic-processing software. Much of the information specific to the data are contained in the headers of the SEG-Y format files. Software is available on this DVD-ROM for viewing and processing the individual swaths using computer systems running a UNIX operating system.
  1. How might this data set be cited?
    Capone, Mark, Scanlon, Kathryn M., and Swift, B. Ann, 2002, Archive of Chirp Subbottom Data Collected During USGS Cruise ORGN00005, Northeastern Gulf of Mexico, 15 February - 2 March, 2000: Open-File Report 2002-045, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: none
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -86
    East_Bounding_Coordinate: -84.3
    North_Bounding_Coordinate: 29.5
    South_Bounding_Coordinate: 28
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 15-Feb-2000
    Ending_Date: 02-Mar-2000
    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?
      Horizontal X and Y UTM coordinates for each shot location are located in the SEG-Y trace headers
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 16
      Scale_Factor_at_Central_Meridian: .9997
      Longitude_of_Central_Meridian: -087.000000
      Latitude_of_Projection_Origin: +00.000000
      False_Easting: 500000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 5
      Ordinates (y-coordinates) are specified to the nearest 5
      Planar coordinates are specified in meters
      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.
      The flattening of the ellipsoid used is 1/298257.
      Altitude_Datum_Name: assumed sea level
      Altitude_Resolution: 1
      Altitude_Distance_Units: two-way travel time
      Altitude_Encoding_Method: Attribute values
      Depth_Datum_Name: local surface (sea level)
      Depth_Resolution: 1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Mark Capone
    • Kathryn M. Scanlon
    • B. Ann Swift
  2. Who also contributed to the data set?
    USGS Seafloor Mapping Group
  3. To whom should users address questions about the data?
    Kathryn M. Scanlon
    U.S. Geological Survey
    Geology of Benthic Habitats Project
    U.S. Geological Survey Woods Hole Field Center, 384 Woods Hole Road, Quissett Campus
    Woods Hole, MA

    (508) 457-2323 (voice)
    (508) 457-2310 (FAX)

Why was the data set created?

In 1999, the Gulf of Mexico Fishery Management Council recommended that NOAA's National Marine Fisheries Service establish two approximately 11-square-mile areas on the shelf edge in the northeastern Gulf of Mexico as no-fishing areas. One of the areas, the Madison-Swanson Marine Protected Area (MPA) lies about 100 km south of Panama City, Florida. The second area, Steamboat Lumps MPA lies about 150 km SSE of Madison-Swanson. The high-resolution seismic-reflection data contained herein were collected as part of a larger study of the effectiveness of no-fishing reserves in protecting grouper spawning aggregations. These subbottom profiles will be used in conjunction with other data to map the seafloor geology and the character and extent of benthic habitats within and surrounding the two MPAs. They show the shape and acoustic impedence of the seafloor and the thicknesses and orientations of shallow subsurface horizons. These data may be helpful in the following applications:
1.choosing biological monitoring sites decisions in the MPAs
3.choosing sites for future MPAs
4.studies of paleo-sealevel
5.studies of the inter-relationships between seafloor geology and benthic ecology
6.studies of sedimentary geology and geologic framework of the northeastern 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: Jul-2000 (process 1 of 2)
    The subbottom data were recorded on the ISIS data acquisition system in QMIPS format. Chirp subbottom channel extracted from raw QMIPS format sonar files and converted to 16-bit Int. SEG-Y format using program the QMIPSTOSEGY. Before the subbottom data are converted to SEG-Y format, the trace data were padded with zero amplitude samples to correct for the depth of the tow fish beneath the water surface. The SIS-1000 tow fish is equipped wiith a pressure transducer for recording the fish depth to the QMIPS file header. The pressure depth is also stored in the optional part of the SEG-Y trace header, so it can be used for further processing. Person who carried out this activity:
    Foster, Dave
    U.S. Geological Survey
    Seafloor Mapping Project
    U.S. Geological Survey, Woods Hole Field Center, 384 Woods Hole Road, Quissett Campus
    Woods Hole, MA

    (508) 548-2271 (voice)
    (508) 457-2310 (FAX)
    Date: 17-Nov-2021 (process 2 of 2)
    Edits to the metadata were made to fix any errors that MP v 2.9.50 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. Other minor edits were performed (series information, adding the DOI link, etc.). Added the USGS Thesaurus and appropriate terms as well as the ISO 19115 Topic Categories thesaurus and appropriate term. Originally a DVD only publication, the distribution section was modified to include the format types that are available from the information available online. No attempt was made to add detailed entity and attribute information specific to the data. The user will need to reference the original Open-File Report for that information. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Additional edits were probably made to the original metadata by someone else who did not document what they changed (20210405). Tweaked a thesaurus name (20211117). Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (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?
  2. How accurate are the geographic locations?
    The ship was navigated with differential GPS
  3. How accurate are the heights or depths?
    There is an apparent accuracy problem in this data set resulting from inaccurate fish depths recorded when the tow fish was raised or lowered. The result is a small vertical offset of the data that can be seen in the plotted profiles. The fish depth appears to adjust to the proper depth within a lag time of several seconds.
  4. Where are the gaps in the data? What is missing?
    Data is complete with regard to surveyed area.
  5. How consistent are the relationships among the observations, including topology?
    The data set was acquired during one cruise and one collection platform, therefore is internally consistent.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
The U.S. Geological Survey must be referenced as the originator of this dataset in any future products or research derived from these data.
Use_Constraints: none
  1. Who distributes the data set? (Distributor 1 of 1)
    Soderberg, Nancy
    U.S. Geological Survey
    Data Library
    U.S. Geological Survey, Woods Hole Field Center, 384 Woods Hole Road, Quissett Campus
    Woods Hole, MA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
  2. What's the catalog number I need to order this data set? U.S. Geological Suvey Internal DVD-ROM Data Archive. The DVD contains Chirp data in SEG-Y format, shot point navigation, GIF format files of the Chirp subbottom profiles. The Open-File report also contains additional information with regards to data acquisition, processing, and maps of navigation.
  3. What legal disclaimers am I supposed to read?
    This DVD-ROM publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this DVD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The Open-File Report contains 152 SEG-Y files. in format SEG-Y
      Network links:
      Data format: The Open-File Report contains a GIF image of each seismic-reflection profile paralleling the SEG-Y files. in format GIF
      Network links:
    • Cost to order the data: none.

Who wrote the metadata?

Last modified: 17-Nov-2021
Metadata author:
Foster, Dave
U.S. Geological Survey
Seafloor Mapping Group
U.S. Geological Survey, Woods Hole Field Center, 384 Woods Hole Road, Quissett Campus
Woods Hole, MA

(508) 548-2271 (voice)
(508) 457-2310 (FAX)
Metadata standard:
FGDC Content Standard (FGDC-STD-001-1998)

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