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What does this data set describe?

Title:
Data of field activity 85027 (F-1-85-GM) in Gulf Mexico from 08/07/1985 to 09/03/1985
Abstract:
United States Geological Survey, Reston, Virginia. Chief Scientists: Bonnie McGregor, Guy Rothwell. Data (sidescansonar, airgun, 3dot5khz, 10khz, magnetics, loranc, transitsatellite, gps) of field activity 85027 (F-1-85-GM) in Gulf Mexico from 08/07/1985 to 09/03/1985, <http://walrus.wr.usgs.gov/infobank/f/f185gm/html/f-1-85-gm.meta.html>.
Supplemental_Information:

Equipment Used -
sidescansonar GLORIA long-range side-scan sonar
airgun 160 and 80 cu in single-channel seismic-reflection system
3dot5khz 3.5 khz bathymetry
10khz 10 khz bathymetry
magnetics
loranc Loran C
transitsatellite Satellite receiver
gps Global Positioning System
Notes -
LEG 1:
&nbsp;&nbsp;
Leg 1 focused on the western half of the Gulf of Mexico, seaward of
Texas and Louisiana, and abutting GLORIA coverage from a 1982 survey. This
portion of the Gulf is dominated by salt tectonics. The area mapped with
GLORIA during this leg was 45,000 sq nautical miles.
&nbsp;&nbsp;
Data Summary - Leg 1
&nbsp;&nbsp;
At sea a total of 27 days
&nbsp;&nbsp;
Mileage for each type of data collected:
&nbsp;&nbsp;
GLORIA sidescan 4430 nm 8195 km
&nbsp;&nbsp;
3.5 kHz 4594 nm 8504 km
&nbsp;&nbsp;
10 kHz 4594 nm 8504 km
&nbsp;&nbsp;
airgun 4430 nm 8195 km
&nbsp;&nbsp;
magnetometer 4080 nm 7548 km
&nbsp;&nbsp;
Comments - Leg 1:
&nbsp;&nbsp;
The weather during leg 1 was generally excellent except for two
hurricanes. Hurricane Danny resulted in a loss of 13 hours of operation
on August 14, 1985, and Hurricane Elena delayed arrival in New Orleans one
day, from September 2 to September 3, 1985.
&nbsp;&nbsp;
The impact that the warm surface water and strong thermocline
present in the Gulf of Mexico in the summer would have on the range of the
GLORIA system was not realized. Although GLORIA was run at a 30 sec.
repetition rate (45 km swath width) the maximum swath width actually obtained
was 8 km in approximately 1000 m of water. This required reducing the
trackline spacing, adding additional tracklines, and thus limiting the effort
in water depths shallower than 1000 m.
&nbsp;&nbsp;
Initially, much time was spent getting all equipment operational.
The GLORIA system suffered from logging problems resulting in a loss of
approximately 24 hours of data during the cruise. The longest continuous
down time period was 12 hours. Dirt particles in the air being pulled across
the recording heads by the air conditioning system appears to have been the
major problem. The airgun system was down a total of approximately 24 hours
due to compressor, streamer, and airgun problems. The longest continuous
period of down time was 7 hours. The magnetometer required 3 days to get
operational initially, but this was partly a result of its lowest priority.
A new computer system was installed for this cruise. Most of the leg was
required to get the system operating properly. Navigation had to be plotted
by hand for the duration of the cruise. Summary data plots for the cruise,
however, track line plots were completed with the computer system at the end
of the cruise.
&nbsp;&nbsp;
The data in the western Gulf are very interesting geologically. The
Sigsbee Escarpment can be identified on the sonographs with piles of debris
in places at its base. A continuous channel can be traced from the shelf edge
through the diapir province of the slope, forming a reentrant in the Sigsbee
Escarpment, and then meandering seaward across the rise into the deep
water of the Gulf. The fan of the Rio Grande has a braided channel system,
on which are features interpreted to be bedforms. Similar bedforms are
present seaward of the Sigsbee Escarpment suggesting that strong bottom
currents are present in the region.
Publications -
Paskevich, Valerie F.; Wong, Florence L.; O'Malley, John J.; Stevenson,
Andrew J.; Gutmacher, Christina E., 2010, GLORIA sidescan-sonar imagery
for parts of the U.S. Exclusive Economic Zone and adjacent areas: U.S.
Geological Survey Open-File Report 2010-1332,
<A HREF="<http://pubs.er.usgs.gov/publication/ofr20101332>"
target="OF1"><http://pubs.er.usgs.gov/publication/ofr20101332>.
&nbsp;&nbsp;
Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar
field data and navigation data collected in the Gulf of Mexico during
R/V Farnella cruises in 1982 and 1985: U.S. Geological Survey Open-File
Report 96-707,
<A HREF="
<http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM>"
target="OF2"><http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM>.

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/>, 20140318, Data of field activity 85027 (F-1-85-GM) in Gulf Mexico from 08/07/1985 to 09/03/1985: 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: -95.66830
    East_Bounding_Coordinate: -81.62170
    North_Bounding_Coordinate: 27.96980
    South_Bounding_Coordinate: 23.82450

  3. What does it look like?

    <http://walrus.wr.usgs.gov/infobank/f/f185gm/html/f-1-85-gm.nav.gif> (GIF)
    Trackline map of F-1-85-GM

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

    Beginning_Date: 07-Aug-1985
    Ending_Date: 03-Sep-1985
    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: Gulf Mexico
      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.

      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:
    Navigation with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/nav.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?

    Bonnie McGregor (Chief Scientist, USGS Miami); Dann Blackwood (Photographer, USGS Woods Hole); Bob Mattick (Geologist Data Curator, USGS Woods Hole); Bill Sweet (Geologist, MMS (Minerals Management Service, U.S.A.)); Kim Benjamin (Engineer, WHOI (Woods Hole Oceanographic Institution, U.S.A.)); Mike Somers (GLORIA Engineer, IOS (Institute of Oceanographic Sciences, U.K.)); Guy Rothwell (Chief Scientist, IOS); Alan Gray (Airgun Tech, IOS); Quentin Huggett (Geologist, IOS); Ross Walker (GLORIA Engineer, IOS); Derek Bishop (GLORIA Engineer, IOS (Institute of Oceanographic Sciences, U.K.)); Christopher Jackson (Shipboard Computing, RVS (Research Vessel Services, U.K.)); E. Cooper (RVS); Roy Hadgraft (Captain, J. Marr and Sons)

  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: 18-Mar-2014 (process 1 of 1)
    Navigation Data
    /infobank/f/f185gm/nav/f-1-85-gm.060
    time/lat/long style, multi-record, in caps, without tabs
    temporal-spatial data
    copied and reformatted from Navigation Data R/V Farnella 85, Leg 1 in:
    Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar field data
    and navigation data collected in the Gulf of Mexico during R/V Farnella cruises
    in 1982 and 1985: U.S. Geological Survey Open-File Report 96-707,
    <http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM>.
     - C Degnan, 3/18/2014
           1         2         3
    3456789012345678901234567890123456
    
    

    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:
    Paskevich, Valerie F.; Wong, Florence L.; O'Malley, John J.; Stevenson, Andrew J.; Gutmacher, Christina E., 2010, GLORIA sidescan-sonar imagery for parts of the U.S. Exclusive Economic Zone and adjacent areas: U.S. Geological Survey Open-File Report 2010-1332, <A HREF="<http://pubs.er.usgs.gov/publication/ofr20101332>" target="OF1"><http://pubs.er.usgs.gov/publication/ofr20101332>. &nbsp;&nbsp; Twichell, David C., and Paskevich, Valerie, 1996, GLORIA sidescan sonar field data and navigation data collected in the Gulf of Mexico during R/V Farnella cruises in 1982 and 1985: U.S. Geological Survey Open-File Report 96-707, <A HREF="<http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM>" target="OF2"><http://woodshole.er.usgs.gov/publications/of96-707/OPR96_707/INTRO.HTM>.



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 (f-1-85-gm.060 [GPS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    198508081910000    198508201230000
    198508201306000    198508241436000
    198508241500000    198508301514000
    198508301554000    198509011548000
    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 85027 (F-1-85-GM) data set <http://walrus.wr.usgs.gov/infobank/f/f185gm/html/f-1-85-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: 1.0
Network links: <http://walrus.wr.usgs.gov/infobank/f/f185gm/html/f-1-85-gm.nav.html>

  • Cost to order the data: None


  • Who wrote the metadata?

    Dates:
    Last modified: 18-Mar-2014
    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 Mar 18 13:00:56 2014