SeaMARC 1A sidescan sonar mosaic for the Mississippi Fan

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Frequently anticipated questions:

What does this data set describe?

Title: SeaMARC 1A sidescan sonar mosaic for the Mississippi Fan
Abstract:
This ArcView GIS layer is a 25 m version of the completed SeaMARC 1A sidescan sonar mosaic.
Supplemental_Information:
Two sets images of the 25 m SeaMARC1A sidescan sonar data are available for the study area. One image set has been radiometrically enhanced for better viewing, and the other set has not been enhanced. This set is available for user's who wish to apply their own enhancements. Additionally, the images are available in both GEOTIFF and JPEG formats.
  1. How might this data set be cited?
    Twichell, Dave, 20000323, SeaMARC 1A sidescan sonar mosaic for the Mississippi Fan: Open-File Report 2000-352, USGS Coastal and Marine Geology Team, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Paskevich, Valerie F., Twichell, David C., and Schwab, William C., 2000, Seamarc 1A sidescan sonar mosaic, cores and depositional interpretation of the Mississippi Fan: ArcView GIS data release: Open-File Report 2000-352, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Paskevich, V.F., Twichell, D.C., and Schwab, W.C., 2000, Seamarc 1A sidescan sonar mosaic, cores and depositional interpretation of the Mississippi Fan—ArcView GIS data release: U.S. Geological Survey Open-File Report 2000-352, https://doi.org/10.3133/ofr00352.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -86.6027
    East_Bounding_Coordinate: -84.9864
    North_Bounding_Coordinate: 26.9
    South_Bounding_Coordinate: 26.1001
  3. What does it look like?
    https://pubs.usgs.gov/of/2000/of00-352/data/imagery/raw/browse/seamarc.gif (SeaMARC 1A sidescan sonar mosaic for the Mississippi Fan)
    GIF
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 25-Mar-1990
    Ending_Date: 08-Apr-1990
    Currentness_Reference:
    data collection
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: remote-sensing image
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 2848 x 5635, type Pixel
    2. What coordinate system is used to represent geographic features?
      The map projection used is Albers Conical Equal Area.
      Projection parameters:
      Standard_Parallel: 29.5
      Standard_Parallel: 45.5
      Longitude_of_Central_Meridian: -089.000000
      Latitude_of_Projection_Origin: +00.000000
      False_Easting: 0
      False_Northing: 0
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 250
      Ordinates (y-coordinates) are specified to the nearest 250
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  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)
    • Dave Twichell
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U. S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2281 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This GIS overlay is a component of the U. S Geological Survey, Woods Hole Field 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.

How was the data set created?

  1. From what previous works were the data drawn?
    QMIPS data tapes (source 1 of 1)
    Twichell(comp.), Dave, Unknown, SeaMARC 1A sidescan sonar mosaic for the Mississippi Fan: Coastal and Marine Geology Team, Woods Hole, MA, U.S. Geological Survey.

    Type_of_Source_Media: magnetic tape
    Source_Contribution:
    SeaMARC 1A sidescan sonar data was collected using the QMIPS data acquisition system and recorded to 8mm digital tape for post-cruise processing.
  2. How were the data generated, processed, and modified?
    Date: Unknown (process 1 of 18)
    The individual SeaMARC 1A sidescan swaths were transferred from tape to disk. The files were subsequently converted from the QMIPS format to a WHIPS format for processing. Person who carried out this activity:
    U. S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • QMIPS data tapes
    Data sources produced in this process:
    • WHIPS data files
    Date: Unknown (process 2 of 18)
    The individual individual swath files were processed using the Woods Hole Image Processing Software (WHIPS). The individual strips were processed to apply geometric (i.e. slant-to-ground range corrections) and radiometric corrections (i.e. beam correction shading). Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • WHIPS data files
    Data sources produced in this process:
    • WHIPS data files
    Date: Unknown (process 3 of 18)
    The SeaMARC 1A files that comprised the eastern half of the survey were transferred to the Woods Hole Field Center's MicroVAX-II computer system. This portion of the survey consisted of mostly straight line segments and were to be digitally mosaicked on this system. (The western portion were done a few months later with developing software). The MicroVAX-II computer system contained the Mini-Image Processing System (MIPS) software that was needed to map and digitally mosaic the data. To begin processing, the WHIPS data files were all converted to MIPS format. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • WHIPS data files
    Data sources produced in this process:
    • MIPS data files
    Date: Unknown (process 4 of 18)
    The MIPS data files were spatially mapped using program GEOM. The files were projected and mapped with a Mercator project and a Clarke 1866 spheroid. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • MIPS data files
    Data sources produced in this process:
    • MIPS data files
    Date: Unknown (process 5 of 18)
    As the individual swaths were mapped, they were geo-referenced to the base image, stenciled and mosaiced to the base. (The base was one swath that had been mapped and was selected as the master which everything would be registered with.) Control points were selected interactively to match features on the adjacent lines and a rubber sheeting procedures were applied to the mapped swaths to better align the images. Once registered, a stencil line was interactively drawn around the area of the line to be added. This stencil area was critical as it not only eliminated the unwanted area that was overlapping the adjacent lines but defined the area to be kept. Finally the registered, transformed and stenciled image was added to the base. These steps were repeated for each swath until the eastern mosaic was completed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • MIPS data files
    Data sources produced in this process:
    • MIPS data files
    Date: Unknown (process 6 of 18)
    The SeaMARC 1A files that comprised the western half of the survey were mapped using the WHIPS software. This area of the survey consisted of several survey line segments. This software could handle curved line segments. The files were projected and mapped with a Mercator project and a Clarke 1866 spheroid to match the eastern portion. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • WHIPS data files
    Data sources produced in this process:
    • WHIPS data files
    Date: Unknown (process 7 of 18)
    The WHIPS mapped swaths were transferred to the Center's MicroVAX-II computer system for stenciling and mosaicking with the MIPS software. Once transferred to the MicroVAX, the files were converted to the MIPS format for processing. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • WHIPS data files
    Data sources produced in this process:
    • MIPS data files
    Date: Unknown (process 8 of 18)
    The converted WHIPS mapped swaths were stenciled and mosaicked with the MIPS software. This procedure is similar to the one outlined for the eastern portion of the survey. Control points were selected interactively to match features on the adjacent lines and a rubber sheeting procedures were applied to the mapped swaths to better align the images. Once registered, a stencil line was interactively drawn around the area of the line to be added. This stencil area was critical as it not only eliminated the unwanted area that was overlapping the adjacent lines but defined the area to be kept. Finally the registered, transformed and stenciled image was added to the base. These steps were repeated for each swath until the western mosaic was completed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • MIPS data files
    Data sources produced in this process:
    • west.pic
    Date: Unknown (process 9 of 18)
    The two completed mosaics, east.pic and west.pic, were combined to create one overall view of the study area. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • east.pic
    • west.pic
    Data sources produced in this process:
    • compos.pic
    Date: Unknown (process 10 of 18)
    The MIPS created mosaic, compos.pic, was transferred to a UNIX computer system. The image was imported into a PCI Remote Sensing database file and georeferenced as Mercator. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Dave Twichell
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov
    Data sources used in this process:
    • compos.pic
    Data sources produced in this process:
    • msfan.pix
    Date: 18-Feb-1999 (process 11 of 18)
    The mosaic, compos.pix, was reprojected from Mercator to UTM using the PCI Remote Sensing software. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • msfan.pix
    Data sources produced in this process:
    • utme00.pix
    Date: 19-Mar-1999 (process 12 of 18)
    Using the PCI Remote Sensing software, a linear contrast stretch was applied to the SeaMARC 1A sidescan sonar mosaic stored in channel 1. This was done to improve the image's viewing by expanding the data's dynamic range. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • utme00.pix chan 1
    Data sources produced in this process:
    • utme00.pix chan3
    Date: 03-Aug-1999 (process 13 of 18)
    The completed, enhanced, 25 m SeaMARC 1A sidescan sonar mosaic was exported from the PCI 'pix' database as a GEOTIFF image with an associated ARC "world" file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • utme00.pix chan 3
    Data sources produced in this process:
    • enhanced/seamarc.jpg
    Date: 03-Aug-1999 (process 14 of 18)
    The completed, enhanced, 25 m SeaMARC 1A sidescan sonar mosaic was exported from the PCI 'pix' database as a JPEG image with an associated ARC "world" file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • utme00.pix chan 3
    Data sources produced in this process:
    • enhanced/seamarc.jpg
    Date: 02-Mar-2000 (process 15 of 18)
    The completed, unenhanced, 25 m SeaMARC 1A sidescan sonar mosaic was exported from the PCI 'pix' database as a GEOTIFF image with an associated ARC "world" file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • utme00.pix chan 1
    Data sources produced in this process:
    • raw/seamarc.tif
    Date: 02-Mar-2000 (process 16 of 18)
    The completed, unehanced, 25 m SeaMARC 1A sidescan sonar mosaic was exported from the PCI 'pix' database as a JPEG image with an associated ARC "world" file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • utme00.pix chan 1
    Data sources produced in this process:
    • raw/seamarc.jpg
    Date: 17-Jul-2024 (process 17 of 18)
    Edited the metadata to remove errors flagged by MP. Filled out the citation information including adding the edition, suggested citation, adding the DOI link and a link to the data page. Added USGS Thesaurus and ISO 19115 Topic Category theme keywords. Added the link to the browse graphic. Additional small edits to the metadata were made to be consistent with current standards. Updated the distribution liability to an approved FSP disclaimer statement. Updated the distribution format and provided links to the data. The metadata date was updated, but not the metadata contact. The metadata contact email was updated to a valid link with an explanation in the contact instructions (20240717). The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 06-Aug-2024 (process 18 of 18)
    Added keywords section with USGS persistent identifier as theme keyword. 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)
    vatnipp@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?
    no attributes associated with the image
  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?
    complete
  5. How consistent are the relationships among the observations, including topology?
    okay

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 Although this derived data set and it's lineage dataset 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.
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 1)
    U. S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
  2. What's the catalog number I need to order this data set? seamarc.tif, seamarc.jpg
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    An image viewer, image processing or GIS software package capable of importing a GEOTIFF or JPEG format file. If the georeferencing information cannot be imported, the user may wish to obtain the georeferencing information contained in a separate file, seamarc.txt, in the imagery/raw/georep or imagery/enhanced/georep directory.
    Access to the data and information contained on this CD-ROM was developed using the HyperText Markup Language (HTML) utilized by the World Wide Web (WWW) project. Development of the CD-ROM documentation and user interface in HTML allows a use to access the information by using a variety of WWW information browsers to facilitate browsing and locating information and data.
    This CD-ROM should be readable by a variety of operating systems including Windows 95/98/NT, Macintosh and UNIX

Who wrote the metadata?

Dates:
Last modified: 06-Aug-2024
Metadata author:
U. S. Geological Survey
Attn: Valerie Paskevich
Computer Specialist
384 Woods Hole Road
Woods Hole, MA
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the person is no longer with USGS.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2000-352/seamarc_meta.faq.html>
Generated by mp version 2.9.51 on Tue Aug 6 15:07:13 2024