b174ar.m77t - MGD77 data file for Geophysical data from field activity B-1-74-AR in Arctic from 07/13/1974 to 08/30/1974

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Frequently anticipated questions:

What does this data set describe?

Title:
b174ar.m77t - MGD77 data file for Geophysical data from field activity B-1-74-AR in Arctic from 07/13/1974 to 08/30/1974
Abstract:
Single-beam bathymetry, gravity, and magnetics data along with transit satellite navigation data was collected as part of field activity B-1-74-AR in Arctic from 07/13/1974 to 08/30/1974, http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.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/b/b174ar/html/b-1-74-ar.bath.html http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.grav.html and http://walrus.wr.usgs.gov/infobank/b/b174ar/html/b-1-74-ar.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, b174ar.m77t - MGD77 data file for Geophysical data from field activity B-1-74-AR in Arctic from 07/13/1974 to 08/30/1974: 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: -173.10616
    East_Bounding_Coordinate: -155.15797
    North_Bounding_Coordinate: 72.48098
    South_Bounding_Coordinate: 63.62852
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 13-Jul-1974
    Ending_Date: 30-Aug-1974
    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: Arctic
      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?
    b174ar.m77t
    MGD77T single-beam bathymetry,gravity, and magnetics data file for B174AR (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:19740808
    Maximum:19740830
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:63.62852
    Maximum:72.48098
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-173.10616
    Maximum:-155.15797
    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:0.036
    Maximum:0.083
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:27
    Maximum:62.2
    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:56869.6
    Maximum:57353.6
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-118.4
    Maximum:1839.4
    Units:gammas
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:982215.3
    Maximum:982794.9
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-39.1
    Maximum:37.3
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:--35.8
    Maximum:61.1
    Units:milligals
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, and magnetic and navigation data for U.S. Geological Survey bathymetry survey B174AR 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?
    Art Grantz (Chief Scientist, USGS Western Region); Robert Roland (Geologist, USGS Western Region); Steve Eittreim (Geologist, 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: 06-Dec-1995 (process 1 of 7)
    Navigation Data >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.B174AR.N]B174AR.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > 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 /lion/b/b174ar/grav/b-1-74-ar.165_053 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/07/86 BARB DUA0:[DATA.BARB.CSTAPES]B174AR.165; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.B174AR.N]B174AR.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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 3 of 7)
    Magnetics Data >06/20/2012 carolyn b-1-74-ar.220_053 > >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 /lion/b/b174ar/mag/b-1-74-ar.200_053 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >02/24/86 CAROLYN DRS$DATA:[B174AR.M]B174AR.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >was B174AR._.MAGSXA on TAM009 >was B174AR200.DAT on MAM009 > >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.B174AR.N]B174AR.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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 /lion/b/b174ar/bath/b-1-74-ar.305_053 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/05/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]B174AR.305; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >I am guessing that this bathy was hand-picked. > >Input was... >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.B174AR.N]B174AR.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >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 (b-1-74-ar.053 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197407130915000 197408302000000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (b-1-74-ar.165_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197407130945180 197407131951000 >197407140124000 197407141155000 >197407141442300 197407142006000 >197407142129480 197407142357480 >197407150126480 197407150317000 >197407150414000 197407150859000 >197407150957180 197407151239120 >197407151324000 197407151830000 >197407151920000 197407152249000 >197407152338300 197407152338300 >197407160120000 197407160205000 >197407160245180 197407160437180 >197407160517300 197407161058000 >197407161154420 197407161154420 >197407161309420 197407161715000 >197407161809420 197407162254420 >197407162350120 197407162350120 >197407170040480 197407170942000 >197407171044120 197407171044120 >197407171144120 197407171445120 >197407171540120 197407171610180 >197407171700420 197407171745480 >197407171848120 197407172230000 >197407172320000 197407180058480 >197407180233480 197407180814420 >197407180905120 197407180905120 >197407181022420 197407181105420 >197407181201420 197407181201420 >197407181302420 197407181302420 >197407181454420 197407181454420 >197407181601420 197407181601420 >197407181707420 197407181707420 >197407182001420 197407182001420 >197407182047420 197407182208420 >197407182335420 197407191228420 >197407191344420 197407191344420 >197407191532420 197407200806180 >197407200914180 197407200914180 >197407201006180 197407201006180 >197407201125120 197407201125120 >197407201217120 197407201217120 >197407201308000 197407201428000 >197407201523000 197407201618000 >197407201748000 197407202303000 >197407210027000 197407210110000 >197407210230480 197407210404480 >197407210504480 197407210504480 >197407210606480 197407210642480 >197407210915480 197407210950480 >197407211052480 197407211219480 >197407211304480 197407211304480 >197407211350480 197407220937480 >197407221058480 197407221901480 >197407230030000 197407231834120 >197407231918120 197407232212120 >197407232257120 197407232257120 >197407232338120 197407240039120 >197407240120120 197407240206180 >197407240257180 197407240613120 >197407240708120 197407240759120 >197407240850120 197407240906120 >197407241043120 197407241043120 >197407241132120 197407241319120 >197407241447120 197407242327420 >197407250013420 197407250426480 >197407250507480 197407250538480 >197407250624480 197407251643480 >197407251725480 197407251908480 >197407252022480 197407260332480 >197407260413480 197407260737480 >197407260823480 197407260937480 >197407261129000 197407261129000 >197407261435120 197407261749120 >197407261922120 197407270002120 >197407270124120 197407270124120 >197407270230120 197407270255120 >197407270342120 197407270635120 >197407270747120 197407270908120 >197407270954120 197407271213120 >197407271324120 197407271506120 >197407271618120 197407271719120 >197407271954180 197407272025180 >197407272137180 197407272137180 >197407280004180 197407280147180 >197407280228180 197407280329180 >197407280415180 197407281453180 >197408052020420 197408052020420 >197408052109120 197408052345180 >197408060029000 197408060927180 >197408061033180 197408061629420 >197408061928300 197408061928300 >197408062106120 197408070914000 >197408071009480 197408071009480 >197408071051480 197408071848120 >197408071929120 197408080607120 >197408080703120 197408081135180 >197408081222120 197408081531480 >197408081615300 197408081716420 >197408081802420 197408090129420 >197408090212120 197408090627120 >197408090804000 197408090924000 >197408091117180 197408100228120 >197408100933300 197408100933300 >197408102352120 197408110806480 >197408110852480 197408111711480 >197408111910120 197408112301480 >197408120053120 197408120512120 >197408120557120 197408121807300 >197408121849120 197408122115480 >197408122212420 197408130402180 >197408130516120 197408131322120 >197408131403000 197408131507000 >197408131627120 197408131718000 >197408131858180 197408132006480 >197408140029300 197408140927300 >197408141115120 197408141145000 >197408141231480 197408141709420 >197408142309480 197408152307480 >197408160135000 197408160354000 >197408161651120 197408162135000 >197408162234420 197408170225480 >197408170450480 197408172054180 >197408172137000 197408172341000 >197408180128420 197408181219480 >197408181403180 197408181403180 >197408181454120 197408190224300 >197408190314420 197408190424120 >197408190509480 197408190726420 >197408190807300 197408190807300 >197408190920300 197408191409480 >197408191515300 197408191759480 >197408191929300 197408200018300 >197408200101120 197408200309120 >197408200538300 197408200608300 >197408200727420 197408201247120 >197408201330300 197408210850000 >197408210946120 197408211649300 >197408211801300 197408220629300 >197408221554120 197408221554120 >197408222220480 197408230008300 >197408240031120 197408240322420 >197408240420420 197408240909000 >197408241003180 197408241547180 >197408242211000 197408260158180 >197408260253180 197408260952180 >197408261053180 197408271306300 >197408271423000 197408271503120 >197408271547300 197408271723420 >197408271812180 197408280239300 >197408280332000 197408290926000 >197408291019420 197408292002180 >197408292209180 197408300509480 >197408300558120 197408301405180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (b-1-74-ar.220_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197408270356596 197408270458073 >197408270513480 197408270516094 >197408270528109 197408270557147 >197408270618172 197408270846357 >197408270857370 197408270857370 >197408270915395 197408270928411 >197408270938423 197408270942428 >197408270955443 197408271016469 >197408271030489 197408271030489 >197408271044506 197408271049512 >197408271100525 197408271100525 >197408271110537 197408271110537 >197408271125555 197408271125555 >197408271152591 197408271156596 >197408272002006 197408272007015 >197408272019048 197408272019048 >197408272030075 197408272030075 >197408272101152 197408272110120 >197408272129222 197408272129222 >197408272158296 197408272158296 >197408272237393 197408272237393 >197408272307469 197408272307469 >197408272322508 197408272330525 >197408272344560 197408272344560 >197408272355588 197408280002006 >197408280039097 197408280039097 >197408280121201 197408280121201 >197408280134235 197408280134235 >197408280147268 197408280147268 >197408280221352 197408280221352 >197408280237393 197408280237393 >197408280303460 197408280303460 >197408280327518 197408280327518 >197408280356592 197408280356592 >197408280416516 197408280431440 >197408280457313 197408280510249 >197408280535124 197408280535124 >197408280551043 197408280649350 >197408280703284 197408280703284 >197408280732139 197408280738110 >197408280749055 197408280847128 >197408280900590 197408280900590 >197408280913461 197408280918413 >197408280929304 197408280944157 >197408281001580 197408281008510 >197408281028314 197408281029304 >197408281041186 197408281112471 >197408281127323 197408281134357 >197408281151089 197408281151089 >197408281204588 197408281242493 >197408281253466 197408281321396 >197408281334364 197408281334364 >197408281346332 197408281346332 >197408281358303 197408281418255 >197408281441196 197408281451172 >197408281511121 197408281511121 >197408281526085 197408281532070 >197408281546033 197408281546033 >197408281600597 197408281605585 >197408281622541 197408281622541 >197408281652335 197408281658307 >197408281726167 197408281726167 >197408281800000 197408281800000 >197408281824475 197408281824475 >197408281839399 197408281839399 >197408281853329 197408281853329 >197408281912237 197408281917211 >197408281937112 197408281937112 >197408281955022 197408281955022 >197408282009576 197408282009576 >197408282024536 197408282024536 >197408282102441 197408282102441 >197408282136360 197408282136360 >197408282202294 197408282202294 >197408282235211 197408282235211 >197408282303140 197408282303140 >197408282318104 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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_89-167/800.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:53 2021