l284an.m77t - MGD77 data file for Geophysical data from field activity L-2-84-AN in Antarctica from 02/03/1984 to 03/03/1984

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Frequently anticipated questions:


What does this data set describe?

Title:
l284an.m77t - MGD77 data file for Geophysical data from field activity L-2-84-AN in Antarctica from 02/03/1984 to 03/03/1984
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-2-84-AN in Antarctica from 02/03/1984 to 03/03/1984, http://walrus.wr.usgs.gov/infobank/l/l284an/html/l-2-84-an.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/l/l284an/html/l-2-84-an.bath.html, http://walrus.wr.usgs.gov/infobank/l/l284an/html/l-2-84-an.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l284an/html/l-2-84-an.mag.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. 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 interpolated. 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, 2013, l284an.m77t - MGD77 data file for Geophysical data from field activity L-2-84-AN in Antarctica from 02/03/1984 to 03/03/1984: 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: 163.00166
    East_Bounding_Coordinate: -173.37114
    North_Bounding_Coordinate: -43.59192
    South_Bounding_Coordinate: -77.64513
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 03-Feb-1984
    Ending_Date: 03-Mar-1984
    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: Antarctica
      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?
    l284an.m77t
    MGD77Tsingle-beam bathymetry, gravity, and magnetics data file for L284AN (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:19840203
    Maximum:19840303
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.75
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-77.64512
    Maximum:-43.59192
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-173.37114
    Maximum:179.99866
    Units:decimal degrees
    POS_TYPE
    Indicates how lat/lon was obtained (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:3
    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:0.067
    Maximum:4.51
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:50.3
    Maximum:3336.5
    Units:decimal meters
    BAT_CPCO
    Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth (Source: NGDC)
    Range of values
    Minimum:63
    Maximum:63
    Units:01-55 Matthews' Zones with zone , 59 Matthews' Zones, no zone specified, 60 S. Kuwahara Formula, 61 Wilson Formula, 62 Del Grosso Formula, 63 Carter's Tables, 88 Other (see Add. Doc.), 97 Computed using 1500 meters/sec, 98 Unknown if Corrected, 99 Unspecified
    BAT_TYPCO
    Bathymetry type code - indicates how the bathymetric value was obtained (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:3
    Units:1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified
    MAG_TOT
    Magnetics total field - 1st sensor (Source: NGDC)
    Range of values
    Minimum:63859.5
    Maximum:66431.6
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:63929
    Maximum:66425.9
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-655.2
    Maximum:719.7
    Units:gammas
    MAG_RESSEN
    SENSOR FOR RESIDUAL FIELD (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:1
    Units:1 - first sensor, 2 - second sensor, 9 - Unspecified
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:980558.9
    Maximum:982989.5
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-15
    Maximum:20.4
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-89.8
    Maximum:40.6
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:401
    Maximum:419
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:41
    Maximum:6359
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L284AN in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation gravity, magnetic, 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?
    Alan Cooper (Chief Scientist)
  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: 19-Jan-1996 (process 1 of 7)
    Navigation Data >Converted to time format with year at start. > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANEOT.070; >DUA0:[DRS.NAV]EOTCSSP.EXE; > >Input was... >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANMERG.070; >DUA0:[DRS.EDIT]MERGEIT.EXE;1 >removed and interpolated 180 degree longitude fix errors > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > 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-Oct-1998 (process 2 of 7)
    Gravity Data >10/31/1998 /tiger/l/l284an/grav/l-2-84-an.163_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >07/07/86 CAROLYN DRS$DATA:[L284AN.NEWZELAND]L284AN.163; >DRB0:[DRS.EDIT]MERGEIT.EXE;1 >eotvos and faa were processed in New Zealand and re-merged >with obs_grv and theo_grv from L284AN.161 for these times: > 034/1013-043/0311 (from RS8401.DAT) > 047/0757-047/1129 (from RS84047.DAT) > 052/0900-054/0300 (from RS84052.DAT) > >The attached memo to Alan Cooper >from Fred Davey (telephone: 738 208) > Department of Scientific and Industrial Research > Geophysics Division > P.O. Box 1320, Wellington, New Zealand >dated 1 August 1986 states: > > Enclosed one magnetic tape with Day 047/0630-1200 and > Day 52/0900-54/0300. > > Data from 4/0100-49/0504 was in general bad, the section > noted above is the only bit I would consider using. > > Data from the start of line 416 is average to poor in quality, > especially with respect to base level shift. The relative > values along the line are probably accurate to about five > milligals, especially over the Iselin Bank, hence I used > the data for modelling. However as an accurate data set > for data bases I would only include them after further > checking with good quality cross lines. Hence they were > left out of the data tape I forwarded. > >03/14/85 BARB USR$DISK:[DRS.DATA.L2.G]L284AN.161; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Meter 53 >Land Ties: 0340850000 968841.9 > 0630619000 968841.9 > >Input was... >Converted to time format with year at start. > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANEOT.070; >DUA0:[DRS.NAV]EOTCSSP.EXE; > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANMERG.070; >DUA0:[DRS.EDIT]MERGEIT.EXE;1 >removed and interpolated 180 degree longitude fix errors > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >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: 21-Jun-2012 (process 3 of 7)
    Magnetics Data >06/21/2012 carolyn l-2-84-an.260_070 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM http://www.ngdc.noaa.gov/IAGA/vmod/igrf11.f >with IGRF-11 coeffiecients integrated into the source code. >/infobank/programs/mag/magred11/magred11.for >Using geodetic coordinate system (Earth shape approximated by spheriod) >with altitude 0.0 km (for sea level). > >Input was... >10/31/1998 /tiger/l/l284an/mag/l-2-84-an.240_070 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/09/86 CAROLYN USR$DISK:[DRS.DATA.L284AN.M]L284AN.240; >034/1547-053/1640 was L24M01.201 >055/0728-056/2127 was L24M02.201 > >Converted to time format with year at start. > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANEOT.070; >DUA0:[DRS.NAV]EOTCSSP.EXE; > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANMERG.070; >DUA0:[DRS.EDIT]MERGEIT.EXE;1 >removed and interpolated 180 degree longitude fix errors > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >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: 07-Feb-2002 (process 4 of 7)
    Bathymetry Data >02/07/2002 clint l-2-84-an.331_070 >/infobank/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/27/85 BECKIE USR$DISK:[DRS.DATA.L284AN.B]L284AN.330; >DRA1:[DRS.REFMT]REFORMAT.EXE;3 >Hand-digetized edited bathy, depth calculated useing >1500M per second as travel time. > >Input was... >Converted to time format with year at start. > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANEOT.070; >DUA0:[DRS.NAV]EOTCSSP.EXE; > >10/16/86 CAROLYN DRS$DATA:[L284AN.TEST]L284ANMERG.070; >DUA0:[DRS.EDIT]MERGEIT.EXE;1 >removed and interpolated 180 degree longitude fix errors > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >08/27/86 BECKIE DUA0:[DATA.L284AN]L284AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L2.N]NEW.055; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >Data has been run through sinsadj, naved and wpedit > >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: 20-Jun-2012 (process 5 of 7)
    MGD77 file creation - 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 interpolated. 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. 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 6 of 7)
    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 7 of 7)
    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 (l-2-84-an.070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198402030906000 198402140217430 >198402140308590 198402140308590 >198402140318280 198402240055000 >198402240339590 198402262119000 >198402262130000 198402262130000 >198402262145000 198402262145000 >198402262200000 198402262200000 >198402262215000 198402262215000 >198402262230000 198402262230000 >198402262245000 198402262245000 >198402262300000 198402262300000 >198402262315000 198402262315000 >198402262330000 198402262330000 >198402262345000 198402262345000 >198402270000000 198402270000000 >198402270015000 198402270015000 >198402270031000 198402270031000 >198402270045000 198402270045000 >198402270100000 198402270100000 >198402270115000 198402270115000 >198402270130000 198402270130000 >198402270145000 198402270145000 >198402270200000 198402270200000 >198402270215000 198402270215000 >198402270242000 198402270242000 >198402270300000 198402270300000 >198402270315000 198402270315000 >198402270330000 198402270330000 >198402270345000 198402270345000 >198402270400000 198402270400000 >198402270415000 198402270415000 >198402270430000 198402270430000 >198402270445000 198402270445000 >198402270500000 198402270500000 >198402270515000 198402270515000 >198402270530000 198402270530000 >198402270545000 198402270545000 >198402270600000 198402270600000 >198402270615000 198402270615000 >198402270630000 198402270630000 >198402270645000 198402270645000 >198402270700000 198402270700000 >198402270715000 198402270715000 >198402270730000 198402270730000 >198402270745000 198402270745000 >198402270800000 198402270800000 >198402270815000 198402270815000 >198402270830000 198402270830000 >198402270845000 198402270845000 >198402270900000 198402270900000 >198402270915000 198402270915000 >198402270930000 198402270930000 >198402270945000 198402270945000 >198402271000000 198402271000000 >198402271015000 198402271015000 >198402271030000 198402271030000 >198402271045000 198402271045000 >198402271100000 198402271100000 >198402271115000 198402271115000 >198402271130000 198402271130000 >198402271145000 198402271145000 >198402271200000 198402271200000 >198402271215000 198402271215000 >198402271230000 198402271230000 >198402271245000 198402271245000 >198402271300000 198402271300000 >198402271315000 198402271315000 >198402271330000 198402271330000 >198402271345000 198402271345000 >198402271400000 198402271400000 >198402271415000 198402271415000 >198402271430000 198402271430000 >198402271445000 198402271445000 >198402271500000 198402271500000 >198402271515000 198402271515000 >198402271530000 198402271530000 >198402271545000 198402271545000 >198402271600000 198402271600000 >198402271615000 198402271615000 >198402271630000 198402271630000 >198402271645000 198402271645000 >198402271700000 198402271700000 >198402271715000 198402271715000 >198402271730000 198402271730000 >198402271745000 198402271745000 >198402271800000 198402271800000 >198402271815000 198402271815000 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>198402162121420 198402162128360 >198402162137120 198402162137120 >198402162142300 198402162232240 >198402162237300 198402162250420 >198402162256060 198402162311240 >198402170012000 198402170151000 >198402170200060 198402170620420 >198402170626480 198402171004180 >198402171537540 198402172016540 >198402172027480 198402172049060 >198402172059240 198402172252420 >198402172258000 198402172312540 >198402180510180 198402181447000 >198402181452540 198402181536540 >198402181542120 198402181607060 >198402181612120 198402181636540 >198402181642360 198402181703240 >198402181709060 198402181737420 >198402181742540 198402181759300 >198402181807480 198402181818420 >198402181825180 198402181828180 >198402181836480 198402181842360 >198402181849060 198402181912180 >198402181917240 198402181934480 >198402181940480 198402182114180 >198402182120180 198402182137000 >198402182142060 198402182142060 >198402182150360 198402182234240 >198402182241120 198402182301420 >198402182309300 198402182325180 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  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 these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution 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. Geological Survey.This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    345 Middlefield Road MS 999
    Menlo Park, CA
    USA

    (650) 329-5078 (voice)
    (650) 329-5190 (FAX)
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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. Any use of trade, product, or firm 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?

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_89-167/839.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:03 2021