Geophysical data for field activity 69002 (K-0-69-GM) in Bay of Campeche, Gulf of Mexico from 01/17/1969 to 01/29/1969

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Geophysical data for field activity 69002 (K-0-69-GM) in Bay of Campeche, Gulf of Mexico from 01/17/1969 to 01/29/1969
Abstract:
Single-beam bathymetry data along with transit satellite navigation data was collected as part of field activity 69002 (K-0-69-GM) in Gulf of Mexico from 01/17/1969 to 01/29/1969, http://walrus.wr.usgs.gov/infobank/k/k069gm/html/k-0-69-gm.meta.html
These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http://walrus.wr.usgs.gov/infobank/k/k069gm/html/k-0-69-gm.bath.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file.
Supplemental_Information:
The navigation data are digitally collected using a Satellite Integrated Navigation (SINS) system. The system is a space-based satellite navigation maintained by the United States government and is accessible using a satellite receiver (MX706 SATNAV with Loran A). This system provides navigational accuracy of approximately 200 m.The Data Acquistion, Processing, and Storage (DAPS) group performs a number of processing steps to the navigation data once it is collected which can vary by cruise. These steps are outlined within the header information in each individual digital navigation (.05x) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". There is no information on how the single-beam bathymetry, gravity, and magnetic data were collected. For each data gathering cruise leg, the available data in the following categories are forwarded to NGDC: navigation, gravity, magnetics, bathymetry, and seismic shot points. The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpo- lated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC.
  1. How might this data set be cited?
    U.S. Geological Survey, and Coastal and Marine Geology Program, 1989, Geophysical data for field activity 69002 (K-0-69-GM) in Bay of Campeche, Gulf of Mexico from 01/17/1969 to 01/29/1969: U.S. Geological Survey, Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Steele, Wm. Clinton, Degnan, Carolyn H., Deeter, Gary B., and Riordan, Jean A., 1980, DESCRIPTION OF MARINE GEOPHYSICAL DATA COLLECTED BY THE U.S. GEOLOGICAL SURVEY AND HOW TO OBTAIN IT: U.S. Geological Survey Open File Report 167, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -96.36667
    East_Bounding_Coordinate: -81.76666
    North_Bounding_Coordinate: 28.38333
    South_Bounding_Coordinate: 23.93333
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 17-Jan-1969
    Ending_Date: 29-Jan-1969
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tab-delimited ASCII text files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Gulf Mexico North
      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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.25722210100002.
  7. How does the data set describe geographic features?
    ka939009.m77t
    MGD77T single-beam bathymetry data file for K069GM (Source: NOAA's National Geophysical Data Center, See Hittelman and others (2010) Cross_Reference section above for details about the MGD77T format and citation information.)
    SURVEY_ID
    Survey identifier supplied by the contributing organization (Source: NGDC) This identifier varies in format and is supplied by the contributing organization
    TIMEZONE
    Time-zone correction (Source: NGDC) In our datasets, no correction was applied. All values equal 0.
    DATE
    YYYYMMDD (Source: NGDC)
    Range of values
    Minimum:19690117
    Maximum:19690129
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.84
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:23.93333
    Maximum:28.38333
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-96.36667
    Maximum:-81.76666
    Units:decimal degrees
    POS_TYPE
    Indicates how lat/lon was obtained (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:1
    Units:1 = observed fix, 3 = interpolated fix, nil = unspecified
    BAT_TTIME
    Bathymetry, 2-way travel time (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.0028
    Maximum:1.63333
    Units:seconds
    Entity_and_Attribute_Overview:
    Bathymetry and navigation data for U.S. Geological Survey bathymetry survey K069GM in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation and bathymetry best files. MGD77T is the standard, defined data format used for geophysical data in the National Geophysical Data Center. See Cross_Reference section above for citation details.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
    • Coastal and Marine Geology Program
  2. Who also contributed to the data set?
    Louis Garrison (Chief Scientist, USGS Corpus Christi); Robert H. Fedden (Chief Scientist, NVO); Henry Berryhill (Scientist, USGS); Harry Hill (Scientist, USGS Western Region); Jack Lee (Scientist, USGS Western Region); Mike Marlow (Scientist, USGS Western Region); Bob Patrick (Scientist, USGS Western Region); Dave Scholl (Scientist, USGS Western Region); Dick Tagg (Scientist, USGS Western Region)
  3. To whom should users address questions about the data?
    Gregory K. Miller
    U.S. Geological Survey
    Physical Scientist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3020 (voice)
    gmiller@usgs.gov

Why was the data set created?

These data and information are intended for science researchers,students, policy makers, and general public. These data are not to be used for navigation purposes. The data are reformatted into MGD77T standard format for inclusion into NOAA's NGDC geophysical database. From there the data will be made available to GeoMapApp ( http://www.geomapapp.org/ ) and Virtual Ocean ( http://www.virtualocean.org/ ) Earth-browsing software. Access to the data is also provided via the USGS Coastal and Marine Geoscience Data System (http://cmgds.marine.usgs.gov/).

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: 31-Jan-2003 (process 1 of 4)
    Navigation Data >01/30/1998 clint k-14-69-gm.050 >/bear/programs/ngdc/unrefngdc/unrefngdc >Integrated navigation (SINS) data >09/17/2001 mosier k-1-69-gm.050 created from k-14-69-gm.050 >01/31/2003 steele k-0-69-gm extracted from k-1-69-gm > Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Jan-2003 (process 2 of 4)
    Bathymetry Data >10/31/1998 /tiger/u/u171gm/bath/u-1-71-gm.335_052 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/24/86 BECKIE DISK$USERDISK:[CLINT.BECKIE]U171GM.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >Velocity of sound assumed in reduction was 1500m/sec >2-way traveltime. > >Input was... >Converted to time format with year at start. > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 01-Feb-2017 (process 3 of 4)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 19-Oct-2020 (process 4 of 4)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 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?
    Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R., 2010, The marine geophysical data exchange format - MGD77 / MGD77T: National Geophysical Data Center, National Oceanic and Atmospheric Administration, Boulder, CO.

    Online Links:

    Other_Citation_Details: 25 p.

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

  1. How well have the observations been checked?
    The validity or accuracy of bathymetry and navigation data is highly qualitative and depends on equipment and operating condition variables. Data quality is unknown, MGD77T files were formatted from InfoBank files 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 (k-0-69-gm.050 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >196901220000000 196901220000000 >196901220150000 196901220600000 >196901220700000 196901220955000 >196901221015000 196901221815000 >196901221825000 196901222055000 >196901222200000 196901222200000 >196901230000000 196901230000000 >196901230125000 196901232330000 >196901240000000 196901240000000 >196901240300000 196901240300000 >196901240400000 196901240400000 >196901240500000 196901240500000 >196901241005000 196901250635000 >196901250700000 196901250700000 >196901250730000 196901250730000 >196901250800000 196901250800000 >196901250830000 196901250830000 >196901250900000 196901250900000 >196901250920000 196901250930000 >196901251000000 196901251000000 >196901251030000 196901251030000 >196901251050000 196901260825000 >196901260900000 196901260900000 >196901260920000 196901271650000 >196901271705000 196901272120000 >196901272135000 196901280005000 >196901280020000 196901280425000 >196901280500000 196901280500000 >196901280700000 196901281520000 >196901281530000 196901281605000 >196901281655000 196901290300000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (k-0-69-gm.320_050) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >196901220150000 196901220600000 >196901220700000 196901220955000 >196901221015000 196901221815000 >196901221825000 196901222055000 >196901230125000 196901232330000 >196901241005000 196901250635000 >196901250700000 196901250700000 >196901250730000 196901250730000 >196901250800000 196901250800000 >196901250830000 196901250830000 >196901250900000 196901250900000 >196901250920000 196901250930000 >196901251000000 196901251000000 >196901251030000 196901251030000 >196901251050000 196901260825000 >196901260920000 196901271650000 >196901271705000 196901272120000 >196901272135000 196901280005000 >196901280020000 196901280425000 >196901280700000 196901281520000 >196901281530000 196901281605000 >196901281655000 196901290300000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST
  5. How consistent are the relationships among the observations, including topology?
    This data set is from one field activity with unknown instrument calibrations. Processed bathymetric depths were spot checked based on latitude and longitude against the Global Multi-Resolution Topography (GMRT) grid within GeoMapApp to ensure reasonable values.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
This information is not intended for navigational purposes.Read and fully comprehend the metadata prior to data use. Uses of thesedata should not violate the spatial resolution of the data. Wherethese data are used in combination with other data of different resolution,the resolution of the combined output will be limited by the lowestresolution of all the data.Acknowledge the U.S. Geological Survey in products derived from these data.Share data products developed using these data with the U.S. GeologicalSurvey.
  1. Who distributes the data set? (Distributor 1 of 1)
    Linda McCarthy
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508.548.8700 (voice)
    508.457.2310 (FAX)
    lpmccarthy@usgs.gov
    Hours_of_Service: 8:00AM to 5:00PM: M-F
    Contact_Instructions:
    This data is available online. The MGD77T files are downloadable from the NGDC (National Geophysical Data Center).
  2. What's the catalog number I need to order this data set? U.S. Geological Survey
  3. What legal disclaimers am I supposed to read?
    No warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: MGD77 is an exchange format for marine geophysical data (bathymetry, magnetics, and gravity). It is intended to be used for the transmission of data to and from a data center and may be useful for the exchange of data to and from a data center and may be useful for the exchange of data between marine institutions. in format MGD77T Size: .1
      Network links: http://www.ngdc.noaa.gov/mgg/trk/trackline/kane/ka939009/mgd77/
    • Cost to order the data: None, if obtained online; otherwise, prices vary.

    • Special instructions:
      Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov).

Who wrote the metadata?

Dates:
Last modified: 19-Oct-2020
Metadata author:
Gregory K. Miller
U.S. Geological Survey
Physical Scientist
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3020 (voice)
gmiller@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/SeriesReports/OFR/OFR_89-167/1078.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:53 2021