l184an.m77t - MGD77 data file for Geophysical data from field activity L-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984

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Frequently anticipated questions:

What does this data set describe?

Title:
l184an.m77t - MGD77 data file for Geophysical data from field activity L-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984, http://walrus.wr.usgs.gov/infobank/l/l184an/html/l-1-84-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/l184an/html/l-1-84-an.bath.html, http://walrus.wr.usgs.gov/infobank/l/l184an/html/l-1-84-an.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l184an/html/l-1-84-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, l184an.m77t - MGD77 data file for Geophysical data from field activity L-1-84-AN in Antarctica from 01/04/1984 to 02/01/1984: 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: 129.74580
    East_Bounding_Coordinate: 173.18375
    North_Bounding_Coordinate: -43.58359
    South_Bounding_Coordinate: -77.10433
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-Jan-1984
    Ending_Date: 01-Feb-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?
    l184an.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L184AN (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:19840104
    Maximum:19840201
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.766
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-77.10433
    Maximum:-43.58359
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:129.74580
    Maximum:173.18375
    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:0.16
    Maximum:6.084
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:120
    Maximum:4530
    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:57621
    Maximum:67439
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:65241.3
    Maximum:67436
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-8899.5
    Maximum:736.1
    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:980572.5
    Maximum:982386.8
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-38.2
    Maximum:29.3
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-117.3
    Maximum:236.6
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:14B
    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:4687
    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 L1824AN 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?
    Monty Hampton (Chief Scientist); Steve Eittreim (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. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >Input was... >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > 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/l184an/grav/l-1-84-an.155_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >11/26/85 BARB DUA0:[DATA.L184AN.G]L184AN.155; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >editing, skipnsave, and eotvos corrections made by Jon Childs > >Input was... >Converted to time format with year at start. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >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-1-84-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/l184an/mag/l-1-84-an.240_070 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >03/21/85 CAROLYN USR$DISK:[DRS.DATA.L184AN.M]L184AN.240; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 >013/2348-029/0813 was L14M10.201 >029/0945-030/0432 was L14M11.201 > >Converted to time format with year at start. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >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: 31-Oct-1998 (process 4 of 7)
    Bathymetry Data >10/31/1998 /tiger/l/l184an/bath/l-1-84-an.330_070 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/01/85 BECKIE USR$DISK:[DRS.DATA.L184AN.B]L184AN.330; >DRA1:[DRS.REFMT]REFORMAT.EXE;4 >Bathymetry is edited digitrack data. > >Input was... >Converted to time format with year at start. > >09/03/85 CAROLYN DUA0:[DATA.L184AN.N]L184AN.070; >DRB0:[DRS.NAV]EOTCSSP.EXE; > >03/14/85 KAYE USR$DISK:[DRS.DATA.L1.N]NEW.054; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >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-1-84-an.070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401042117380 198401060155250 >198401060205460 198401100848000 >198401100904000 198401130719000 >198401130726000 198401150006070 >198401150019000 198401150019000 >198401150029060 198401150858380 >198401150904330 198401151109530 >198401151114540 198401151114540 >198401151124110 198401170023100 >198401170036170 198401200512180 >198401200522070 198401241617000 >198401241741000 198401301507000 >198401301513000 198402010618000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-1-84-an.155_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401050142590 198401050515400 >198401050540070 198401060155190 >198401060242200 198401070006190 >198401070043510 198401070132400 >198401070147000 198401071426190 >198401071433590 198401072300190 >198401072309190 198401080120190 >198401080337200 198401080828400 >198401081154000 198401091959190 >198401100614410 198401110418400 >198401110431400 198401140614380 >198401140633380 198401140735580 >198401140806380 198401141500380 >198401152210170 198401160542590 >198401160607190 198401160919590 >198401161101190 198401170741380 >198401170839380 198401171416580 >198401171459580 198401180701580 >198401180805380 198401181525400 >198401181605200 198401190626190 >198401190717190 198401200130580 >198401200218380 198401200601580 >198401200640580 198401202240380 >198401202316500 198401210513190 >198401210609190 198401211827590 >198401211900590 198401221829190 >198401221907590 198401230111190 >198401230739590 198401231924580 >198401240301200 198401240443400 >198401240450200 198401240855190 >198401241520590 198401241729590 >198401250634190 198401251222200 >198401251325200 198401252235590 >198401252311590 198401260130190 >198401260816190 198401260946190 >198401261008590 198401261159190 >198401261236590 198401261351190 >198401261444190 198401262057190 >198401270038190 198401270440190 >198401270732590 198401272329590 >198401280346590 198401282358190 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-1-84-an.260_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401132348400 198401140737160 >198401141623540 198401231943570 >198401270712030 198401290708110 >198401290716350 198401290813570 >198401290945340 198401291523330 >198401292001590 198401300432260 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-1-84-an.330_070) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198401150027180 198401150325300 >198401150333420 198401150441300 >198401150454540 198401150617060 >198401150630120 198401150707300 >198401150716120 198401150717180 >198401150725120 198401150919060 >198401150927420 198401151022480 >198401151028540 198401151111060 >198401151126000 198401151203360 >198401151217300 198401151232360 >198401151241540 198401151243180 >198401151301540 198401151323000 >198401151332180 198401151340300 >198401151350060 198401151357480 >198401151409060 198401160000420 >198401160005540 198401160011000 >198401160021300 198401160117060 >198401160123360 198401160225060 >198401160234300 198401160247180 >198401160255540 198401160301540 >198401160313240 198401160507540 >198401160514360 198401160514360 >198401160521240 198401160521240 >198401160526300 198401160526300 >198401160532300 198401160532300 >198401160537540 198401160541420 >198401160549480 198401160549480 >198401160555000 198401160607480 >198401160626120 198401161001180 >198401161012480 198401161024480 >198401161034000 198401161858360 >198401161908120 198401162208540 >198401162214060 198401162214060 >198401162219300 198401162219300 >198401162225000 198401162225000 >198401162231360 198401162231360 >198401162238480 198401162238480 >198401162245240 198401170023120 >198401170034480 198401170344540 >198401170354180 198401170759120 >198401170806300 198401171248120 >198401171254300 198401171713540 >198401171719420 198401171847000 >198401171904060 198401190018300 >198401190030300 198401190045120 >198401190108000 198401190205360 >198401190222120 198401190550180 >198401190558300 198401191320540 >198401191327540 198401191335000 >198401191342420 198401200003540 >198401200014360 198401200018120 >198401200025300 198401200513300 >198401200520180 198401200630000 >198401200636540 198401200717300 >198401200734120 198401200814480 >198401200822540 198401201112180 >198401201147000 198401201609060 >198401201614540 198401202324300 >198401202331360 198401202347060 >198401202354060 198401210239060 >198401210250540 198401210303000 >198401210310180 198401210400000 >198401210412120 198401210417480 >198401210427540 198401210453180 >198401210501000 198401210706420 >198401210714360 198401211149480 >198401211155240 198401211200540 >198401211209540 198401211211060 >198401211217180 198401211315060 >198401211323060 198401211333240 >198401211343360 198401211402120 >198401211417120 198401220127300 >198401220136480 198401220430060 >198401220438420 198401220512540 >198401220519480 198401220646240 >198401220653000 198401220816540 >198401220823300 198401221540300 >198401221547360 198401222359060 >198401230005000 198401230008540 >198401230023540 198401230214240 >198401230220180 198401230235000 >198401230252360 198401231118180 >198401231125240 198401231900000 >198401231929180 198401231934180 >198401231945120 198401231948480 >198401231955420 198401241621000 >198401241628000 198401241634000 >198401241640000 198401241654000 >198401241700000 198401242018000 >198401242028000 198401242032000 >198401242040000 198401242126000 >198401242140000 198401242145000 >198401242210000 198401242214000 >198401242310000 198401251240000 >198401251248000 198401251515000 >198401251524000 198401251701000 >198401251713000 198401260333420 >198401260342180 198401260349180 >198401260355120 198401260627360 >198401260643000 198401260651360 >198401260702240 198401260803180 >198401260810420 198401261203180 >198401261216300 198401261318420 >198401261330420 198401261444540 >198401261452180 198401261525120 >198401261539540 198401261550300 >198401261609300 198401261625120 >198401261635060 198401261641540 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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_89-167/836.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:59 2021