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What does this data set describe?

Title:
Data of field activity 85034 (F-3A-85-GM) in Gulf Mexico from 10/02/1985 to 10/22/1985
Abstract:
United States Geological Survey, Woods Hole, Massachusetts. Chief Scientists: Dave Twichell, Lindsay Parson. Data (sidescansonar, airgun, 3dot5khz, 10khz, magnetics, loranc, transitsatellite, gps) of field activity 85034 (F-3A-85-GM) in Gulf Mexico from 10/02/1985 to 10/22/1985, <http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-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 -
NARRATIVE:
&nbsp;&nbsp;
Leg 3A was very successful. The weather was superb and imposed no
restrictions on the operation of the equipment. The warm surface water
temperatures, which imposed such severe restrictions on the line spacing during
legs 1 and 2, were not as serious a problem during this leg because of the deep
water depths in which we were working most of the time. The only area where
the surface water temperature affected the sonar's range was in the shallow
water east of the Florida Escarpment, but even here we were able to get
complete GLORIA coverage to depths of 400-1,000m. The Loop Current in the
southeastern corner of the Gulf reached speeds of 7.4 km/hr (4 kts) and was
highly variable in its direction of flow. This current made it difficult to
steer straight lines, and had an effect on the orientation of the GLORIA
vehicle. The greatest challenge to operations, though, was fishing boats and
their long-line fishing gear. The lines were as long as 65 km (35 nm) and
were 20 m below the surface; too shallow to go over with GLORIA. The fishing
fleet was particularly abundant in the DeSoto Canyon area, but some were
also found near the edge of the Florida Escarpment at 25dN. The long-line
gear is the reason for the peculiarities in the ship's track in these two
areas.
&nbsp;&nbsp;
After the first two days, equipment down time was minimal and operation
were very smooth. There were some logging problems with the GLORIA system and
about 11 hours of data were lost at the beginning of the cruise. Initially the
Muirhead camera (part of the system used to play back the data for building
the at-sea mosaic) was not working properly, but it was fixed and caused only
a slight delay in building the mosaic. The preamplifier in the Northstar
Loran C antenna was damaged when we left Tampa and could not be fixed, but we
managed very well using a combination of Loran C fixes from the ship's
receiver, satellite fixes, and fixes from the Global Positioning System when
available (6-7 hours a day). The seismic-reflection system was down for about
9 hours during the entire cruise. A 160 cu in airgun was used for the first
three days, and after that we switched to an 80 cu in chamber. The smaller
chamber resulted in much less wear on the airgun, yet still provided excellent
subbottom penetration.
&nbsp;&nbsp;
The data from leg 3A were full of surprises. The Florida Escarpment
was spectacular, and showed a lot of unexpected changes in morphology along
its length. Mass wasting on the slope above the escarpment was more extensive
than expected, especially south of about 26dN. The slide or slides on the
Mississippi Fan that we started mapping on Leg 2 extend to the southeastern
corner of the Gulf (24dN). The distal end of the Mississippi Channel was
found at about 25d30'N-86dW, but it was filled with slide deposits which
extended much further to the south.
&nbsp;&nbsp;
TABULATED INFORMATION:
&nbsp;&nbsp;
A. Days at sea: 20
&nbsp;&nbsp;
B. Amount of data collected:
&nbsp;&nbsp;
System Time Spent Km Data Collected
&nbsp;&nbsp;
GLORIA 424 hr 45 min 6,557
&nbsp;&nbsp;
10 kHz profiler 435 hr 6,734
&nbsp;&nbsp;
3.5 kHz profiler 435 hr 15 min 6,738
&nbsp;&nbsp;
Airgun 428 hr 6,578
&nbsp;&nbsp;
Magnetometer 433 hr 30 min 6,712
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 85034 (F-3A-85-GM) in Gulf Mexico from 10/02/1985 to 10/22/1985: 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: -88.26970
    East_Bounding_Coordinate: -82.00210
    North_Bounding_Coordinate: 29.21060
    South_Bounding_Coordinate: 23.87920

  3. What does it look like?

    <http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-85-gm.nav.gif> (GIF)
    Trackline map of F-3A-85-GM

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

    Beginning_Date: 02-Oct-1985
    Ending_Date: 22-Oct-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?

    Roy Hadgraft (Captain, J. Marr and Sons); Dave Twichell (Chief Scientist, USGS Woods Hole); Robert Commeau (Geologist, USGS Woods Hole); Steven Mateus (Geologist, USGS Woods Hole); Page Valentine (Geologist Data Curator, USGS Woods Hole); Charlie Paull (Geologist, Scripps Institute of Oceanography); Kim Benjamin (Engineer, Woods Hole Oceanographic Institution); Derek Bishop (GLORIA Engineer, IOS (Institute of Oceanographic Sciences, U.K.)); Lindsay Parson (Co-chief Scientist, IOS); Robin Bonner (Airgun Tech, IOS); Jon Campbell (GLORIA Engineer, IOS); Andrew Harris (GLORIA Engineer, IOS); Colin Jacobs (Geologist, IOS); Doriel Jones (Shipboard Computing, RVS (Research Vessel Services, U.K.)); Derek Lewis (Shipboard Computing, RVS)

  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/f3a85gm/nav/f-3a-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 3 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, 3/17/2014
           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-3a-85-gm.060 [GPS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    198510031400000    198510111310000
    198510111422000    198510211936000
    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 85034 (F-3A-85-GM) data set <http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-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: 0.8
Network links: <http://walrus.wr.usgs.gov/infobank/f/f3a85gm/html/f-3a-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 10:09:55 2014