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What does this data set describe?

Title:
Multichannel Sesmic and Sidescan Sonar data of field activity 99002 (G-1-99-GM) in Northern Gulf of Mexico - Louisiana continental slope from 04/09/1999 to 04/21/1999
Abstract:
United States Geological Survey, Woods Hole, Massachusetts. Chief Scientists: Alan Cooper, Dave Twichell. Multichannel Sesmic and Sidescan Sonar data (24channel, sidescansonar, SIS1000, Huntec, 2channelwatergun) of field activity 99002 (G-1-99-GM) in Northern Gulf of Mexico - Louisiana continental slope from 04/09/1999 to 04/21/1999, <http://walrus.wr.usgs.gov/infobank/g/g199gm/html/g-1-99-gm.meta.html>.
Supplemental_Information:

Equipment Used -
24channel high-resolution mcs
sidescansonar
SIS1000 CHIRP seismic
Huntec Huntec seismic
2channelwatergun
Publications -
Cooper, Alan, Twichell, David, and Hart, Patrick, 1999, A seismic-reflection
investigation of gas hydrates and sea-floor features of the upper continental
slope of the Garden Banks and Green Canyon regions, northern Gulf of Mexico:
Report for cruise G-1-99-GM (99002), US Geological Survey Open-File Report
990570, URL:
<A HREF ="<http://geopubs.wr.usgs.gov/open-file/of99-570/>" target = "OF"> <http://geopubs.wr.usgs.gov/open-file/of99-570/>

Similar information is available for thousands of other USGS/CMG-related Activities.
If known, available are Activity-specific navigation, gravity, magnetics, bathymetry, seismic, and sampling data; track maps; and equipment information; as well as summary overviews, crew lists, and information about analog materials.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at:
<http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Primary access to the USGS/CMG Information Bank's digital data, analog data, and metadata is provided through... <http://walrus.wr.usgs.gov/infobank/>
This page accomodates a variety of search approaches (e.g., by platform, by region, by scientist, by equipment type, etc.).
  1. How should this data set be cited?

    U.S. Geological Survey (USGS) <http://www.usgs.gov/>, Coastal and Marine Geology Program (CMGP) <http://marine.usgs.gov/>, 20131029, Multichannel Sesmic and Sidescan Sonar data of field activity 99002 (G-1-99-GM) in Northern Gulf of Mexico - Louisiana continental slope from 04/09/1999 to 04/21/1999: U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -94.81837
    East_Bounding_Coordinate: -91.42861
    North_Bounding_Coordinate: 29.34556
    South_Bounding_Coordinate: 27.36766

  3. What does it look like?

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

    Beginning_Date: 09-Apr-1999
    Ending_Date: 21-Apr-1999
    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?

      Indirect_Spatial_Reference: Northern Gulf of Mexico - Louisiana continental slope
      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 0.00001. Longitudes are given to the nearest 0.00001. 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.
      The flattening of the ellipsoid used is 1/298.257.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values


  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Bathymetry with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/bath.html>
    Entity_and_Attribute_Overview:
    Navigation with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/nav.html>
    Entity_and_Attribute_Overview:
    Seismic Shots with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/seis.html>


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?

    Alan Cooper (Chief Scientist, USGS Western Region); Dave Twichell (Chief Scientist, USGS-WHOI); Pat Hart (MCS Watchstander, USGS Western Region); Jeff Brody (MCS Watchstander, USGS Western Region); Chris Anton (Side Scan Watchstander, USGS-WHOI); Barry Irwin (Side Scan Watchstander, USGS-WHOI); Dave Foster (Chirp Seismic Processor, USGS-WHOI ); Bill Danforth (Side Scan Processor, USGS-WHOI); Dave Nichols (Electronics Technician & Side Scan Watchstander, USGS-WHOI); Larry Kooker (Electronics Technician, USGS Western Region); Tom O'Brien (Electronics Technician, USGS-WHOI); Hal Williams (Marine Technician, USGS Western Region); Walt Olson (Marine Technician, USGS Western Region); Graham Standen (Huntec Engineer, Geoforce Corp.)

  3. To whom should users address questions about the data?

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>


Why was the data set created?

These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.


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: 10-Jun-1999 (process 1 of 2)
    Navigation Data
    Clint 6/10/99
    Adjusted bad navigation from:
       19991080028400 to 19991080104100
    by
       adding 0.00880 degrees to latitude
       subtracting 0.03950 from longitude
    Bad navigation apparently caused by system crash
    at start of JD 108, then improper position
    when system restarted at 19991080028400
    
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Date: 07-Feb-2002 (process 2 of 2)
    Bathymetry Data
    02/07/2002 ghatcher g-1-99-gm.301_063
    /infobank/programs/edit/automerge/automerge
    merged nav and bathy
    
    Input was...
    06/03/1999 clint /tiger/g/g199gm/bath/g-1-99-gm.301
    nozerobathy
    Raw depth (bathymetry) data
    Bathy values of 0.0 removed.
    
    Input was...
    Clint 6/10/99
    Adjusted bad navigation from:
       19991080028400 to 19991080104100
    by
       adding 0.00880 degrees to latitude
       subtracting 0.03950 from longitude
    Bad navigation apparently caused by system crash
    at start of JD 108, then improper position
    when system restarted at 19991080028400
    
    time, lat, long, time(sec) to nearest nav fix, data values
    

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

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

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Unknown, USGS/CMG Information Bank <http://walrus.wr.usgs.gov/infobank/>: U.S. Geological Survey (USGS) <http://www.usgs.gov> Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

    Other_Citation_Details:
    Cooper, Alan, Twichell, David, and Hart, Patrick, 1999, A seismic-reflection investigation of gas hydrates and sea-floor features of the upper continental slope of the Garden Banks and Green Canyon regions, northern Gulf of Mexico: Report for cruise G-1-99-GM (99002), US Geological Survey Open-File Report 990570, URL: <A HREF ="<http://geopubs.wr.usgs.gov/open-file/of99-570/>" target = "OF"> <http://geopubs.wr.usgs.gov/open-file/of99-570/>



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

  1. How well have the observations been checked?

    Identified as best available version.

  2. How accurate are the geographic locations?

    Unspecified

  3. How accurate are the heights or depths?

    Unspecified

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

    Start and end date/times of data

    Navigation Data (g-1-99-gm.063 [GPS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    199904091345404    199904091345404
    199904091354304    199904091355304
    199904091414503    199904091433304
    199904091524403    199904091526203
    199904091553403    199904091554403
    199904091605203    199904091632003
    199904091640104    199904091642303
    199904091648003    199904091659103
    199904091705403    199904091717000
    199904091729000    199904092137403
    199904092153405    199904092331104
    199904092338104    199904110000002
    199904110008401    199904142140303
    199904142342204    199904150253404
    199904150307304    199904180000100
    199904180028400    199904180057202
    199904180103200    199904201519303
    199904201531304    199904201531504
    199904201554000    199904211550402
    199904211616102    199904211617302
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Bathymetry Data (g-1-99-gm.301_063)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    199904091817000    199904092137403
    199904092153405    199904092331104
    199904092338104    199904142140303
    199904142342204    199904150253404
    199904150307304    199904180017500
    199904180038500    199904180057202
    199904180103200    199904201519303
    199904201617201    199904211550402
    199904211616202    199904211617302
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    Seismic Shots Data (g-1-99-gm.420_063)
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    199904101751040    199904102236080
    199904102254470    199904102359140
    199904110009540    199904110013550
    199904110021440    199904110202220
    199904110228150    199904110312450
    199904110320170    199904110330200
    199904110400050    199904110425590
    199904110438360    199904110438360
    199904110445230    199904110542240
    199904110550260    199904111130210
    199904111218030    199904111248250
    199904111255120    199904111316260
    199904111322090    199904111350130
    199904111400140    199904111523010
    199904111534540    199904111619190
    199904111630040    199904111825310
    199904111831210    199904112049570
    199904112103010    199904112338070
    199904112346220    199904120013070
    199904120021430    199904120050040
    199904120058490    199904120125040
    199904120137470    199904120449550
    199904120458330    199904120830190
    199904120902470    199904121343170
    199904121355210    199904121732510
    199904121740460    199904122144590
    199904122203010    199904122309320
    199904122332280    199904130228000
    199904130308360    199904130443240
    199904130449260    199904130702470
    199904130713030    199904131113140
    199904131123530    199904131521560
    199904131534290    199904131904430
    199904131921360    199904132328280
    199904140021050    199904140035150
    199904140327420    199904140443590
    199904140450010    199904140456020
    199904140555290    199904140752590
    199904140810280    199904141045550
    199904141052020    199904141202210
    199904141215370    199904141225400
    199904141231410    199904141237560
    199904141252000    199904141508500
    199904141520480    199904141538530
    199904162112220    199904162344280
    199904170003270    199904170019320
    199904170241060    199904170500440
    199904170508290    199904170818520
    199904170827320    199904171456370
    199904171510390    199904171622330
    199904171628350    199904172033550
    199904172050290    199904172332210
    199904180116110    199904180146320
    199904180158230    199904180421470
    199904180456060    199904180456060
    199904180503010    199904180848330
    199904180854350    199904180856360
    199904180903370    199904181008560
    199904181353590    199904181358410
    199904181408550    199904182136100
    199904182143230    199904182256390
    199904182307030    199904190159190
    199904190205200    199904190742240
    199904190753110    199904190908290
    199904190914310    199904191449310
    199904191457060    199904191551220
    199904191557230    199904192024460
    199904192037180    199904200034270
    199904200056250    199904200118440
    199904200124460    199904200543390
    199904200611360    199904200951180
    199904200959210    199904201124270
    199904201136410    199904201518430
    199904201558210    199904201600220
    199904201606230    199904201930370
    199904201936330    199904202142160
    199904202147480    199904202222000
    199904202232080    199904202330550
    199904202342440    199904210029070
    199904210121060    199904210203330
    199904210213440    199904210231580
    199904210238010    199904210549380
    199904210559350    199904210944060
    199904210950050    199904211321020
    199904211326310    199904211425020
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    

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

    Unspecified


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Physical materials are under controlled on-site access.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Physical materials are under controlled on-site access.
Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

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

    Downloadable Data 99002 (G-1-99-GM) data set <http://walrus.wr.usgs.gov/infobank/g/g199gm/html/g-1-99-gm.meta.html>

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
    Physical materials are under controlled on-site access.
    Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
    This information is not intended for navigational purposes.
    Any use of trade, firm, or product 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?

    • Availability in digital form:

Data format: ASCII Size: 3.6
Network links: <http://walrus.wr.usgs.gov/infobank/g/g199gm/html/g-1-99-gm.nav.html>

Data format: ASCII Size: 5.4
Network links: <http://walrus.wr.usgs.gov/infobank/g/g199gm/html/g-1-99-gm.bath.html>

Data format: ASCII Size: 0.3
Network links: <http://walrus.wr.usgs.gov/infobank/g/g199gm/html/g-1-99-gm.seis.html>

  • Cost to order the data: None


  • Who wrote the metadata?

    Dates:
    Last modified: 29-Oct-2013
    Metadata author:
    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Metadata standard:
    FGDC Content Standards for Digital Geospatial Metadata <http://www.fgdc.gov/> (FGDC-STD-001-1998 <http://www.its.nbs.gov/nbs/meta/meta.html>)


    Generated by mp version 2.9.13 on Tue Oct 29 10:40:52 2013