l478bs.m77t - MGD77 data file for Geophysical data from field activity L-4-78-BS in Bering Sea, Alaska from 07/08/1978 to 08/01/1978

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Frequently anticipated questions:

What does this data set describe?

Title:
l478bs.m77t - MGD77 data file for Geophysical data from field activity L-4-78-BS in Bering Sea, Alaska from 07/08/1978 to 08/01/1978
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-4-78-BS in Bering Sea, Alaska from 07/08/1978 to 08/01/1978, http://walrus.wr.usgs.gov/infobank/l/l478bs/html/l-4-78-bs.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/l478bs/html/l-4-78-bs.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. 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, l478bs.m77t - MGD77 data file for Geophysical data from field activity L-4-78-BS in Bering Sea, Alaska from 07/08/1978 to 08/01/1978: 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: -179.18130
    East_Bounding_Coordinate: -152.06920
    North_Bounding_Coordinate: 64.43768
    South_Bounding_Coordinate: 52.55072
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 08-Jul-1978
    Ending_Date: 01-Aug-1978
    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: Bering Sea, Alaska
      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?
    l478bs.m77t
    MGD77T single-beam bathymetry data file for L478BS (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:19780708
    Maximum:19780801
    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:52.55072
    Maximum:64.43557
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-179.18107
    Maximum:-152.06930
    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:0.073
    Maximum:9.161
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:54.7
    Maximum:6943.7
    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:46240
    Maximum:59846.5
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:45978
    Maximum:52161
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-3920.3
    Maximum:8252.5
    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:981305.1
    Maximum:982218.4
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-39.8
    Maximum:29.9
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-104.8
    Maximum:107.3
    Units:milligals
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L478BS 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); Mike Marlow (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. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >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 /tiger/l/l478bs/grav/l-4-78-bs.165_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DUA0:[DATA.L578BS]L578BS.165; >DRB0:[CLINT]REFMTJCGRV.EXE; >reformatted from JChilds file l578bs.sm_grv > >Input was... >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >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: 21-Jun-2012 (process 3 of 7)
    Magnetics Data >06/21/2012 carolyn l-4-78-bs.260_010 > >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/l478bs/mag/l-4-78-bs.240_010 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/21/86 CAROLYN DRS$DATA:[L578BS.M]L578BS.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >191/0757-194/0836: > was L578BS._.MAGSC1 on TAM173 > was L578BS220.DAT on VAM173 >194/1247-205/1246: > was L578BS._.MAGSC2 on TAM174 > was L578BS220.DAT on VAM174 > >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >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 /tiger/l/l478bs/bath/l-4-78-bs.335_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/12/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L578BS.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >It was reduced with no Matthews correction and velocity >of sound assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L578BS.N]L578BS.010; >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 (l-4-78-bs.010 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807080653000 197807210640100 >197807210703500 197807211802300 >197807211818200 197807212151400 >197807212206400 197807220042000 >197807220125200 197807220210000 >197807220225100 197807220230100 >197807220308300 197807220439500 >197807220518500 197807230100000 >197807230122000 197807230136000 >197807230200000 197807230200000 >197807230230000 197807230230000 >197807230300000 197807230300000 >197807230330000 197807230330000 >197807230430000 197807230430000 >197807230500000 197807230500000 >197807230530000 197807230530000 >197807230630000 197807230630000 >197807230700000 197807230700000 >197807230730000 197807230730000 >197807230744000 197807230744000 >197807230756000 197807230800000 >197807231009380 197807232235500 >197807232248100 197807251105100 >197807251123500 197807251259300 >197807251310500 197807261659300 >197807261732300 197807262129100 >197807262209300 197807270044300 >197807270104500 197807270230100 >197807270404300 197807270611500 >197807270649300 197807270911300 >197807270925100 197807271616000 >197807271908000 197807280402200 >197807280417200 197807280454200 >197807280506000 197807281640400 >197807281659000 197807291514000 >197807291603300 197807291641500 >197807291706500 197807292102500 >197807292204200 197807292250400 >197807292336400 197807300123500 >197807300211500 197807300211500 >197807300311100 197807301204500 >197807301223100 197807302135100 >197807302159300 197807311953500 >197807312004500 197808011729500 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-4-78-bs.165_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807082035300 197807100655300 >197807150920420 197807151502420 >197807152204120 197807160536300 >197807161925300 197807170300000 >197807170306120 197807170402120 >197807200922000 197807201410000 >197807201432000 197807201852000 >197807210653120 197807211119120 >197807211136120 197807211730120 >197807211921000 197807212129000 >197807212155000 197807220043000 >197807220053420 197807220155420 >197807220234480 197807220434480 >197807220454480 197807220755420 >197807220804420 197807221133120 >197807221141480 197807221623480 >197807221643480 197807221945480 >197807231029480 197807231203480 >197807231737480 197807240253480 >197807240309480 197807240535480 >197807240600000 197807240703480 >197807240726480 197807240910480 >197807240927480 197807240939480 >197807241005480 197807241027480 >197807241035480 197807241153480 >197807241212480 197807241312480 >197807241335480 197807241529480 >197807241555480 197807241747480 >197807241816480 197807241906480 >197807241946480 197807250038480 >197807250339480 197807251231480 >197807251257480 197807251629480 >197807251654480 197807251712480 >197807251727480 197807251939480 >197807260309480 197807260447480 >197807260506480 197807260722480 >197807260752480 197807261322480 >197807261350480 197807261450480 >197807261525480 197807262057480 >197807302359120 197807310135120 >197807310203120 197807311229120 >197807311237120 197808011559120 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-4-78-bs.260_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807100757280 197807101025340 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-4-78-bs.335_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197807091912300 197807091937480 >197807091955420 197807092059300 >197807092236420 197807100103360 >197807100109120 197807100113300 >197807100144540 197807100201240 >197807100226120 197807100233120 >197807100239300 197807100255540 >197807100306180 197807100310180 >197807100317000 197807100317000 >197807100326060 197807100708360 >197807100714120 197807100737360 >197807100818300 197807100957120 >197807101037480 197807101304360 >197807101329360 197807101626180 >197807101638480 197807101722240 >197807101728120 197807101804360 >197807101823180 197807102303540 >197807102314120 197807110119000 >197807110125360 197807111250000 >197807111255180 197807112002540 >197807112008000 197807112008000 >197807112013480 197807112111420 >197807112116480 197807112116480 >197807112122000 197807112150180 >197807112155360 197807112200120 >197807112206000 197807112206000 >197807112211240 197807112211240 >197807112216300 197807112218300 >197807112224240 197807112228240 >197807112235360 197807112235360 >197807112242480 197807112242480 >197807112248240 197807112248240 >197807112254360 197807112254360 >197807112300000 197807112329300 >197807112334420 197807112352000 >197807120025180 197807120033240 >197807120039060 197807120043300 >197807120048360 197807120048360 >197807120056060 197807120056060 >197807120101240 197807120101240 >197807120108060 197807120108060 >197807120114000 197807120118540 >197807120124060 197807120129060 >197807120136420 197807121248360 >197807121254060 197807121315300 >197807121321060 197807121329300 >197807121335060 197807121350060 >197807121356120 197807121453060 >197807121458120 197807121758060 >197807121803120 197807122110120 >197807122117360 197807130431180 >197807130450360 197807130541540 >197807130556540 197807130556540 >197807130709420 197807131010420 >197807131016060 197807131020420 >197807131032540 197807131136420 >197807131144060 197807131323240 >197807131352120 197807131609000 >197807131624420 197807132301000 >197807132315240 197807140132060 >197807140143000 197807140143000 >197807140148240 197807140208060 >197807140214120 197807140438480 >197807140510540 197807140600540 >197807140619420 197807140621480 >197807140634180 197807140638360 >197807140645060 197807140703420 >197807140709120 197807140939180 >197807140945360 197807141007060 >197807141012540 197807141012540 >197807141018060 197807141021180 >197807141026360 197807141313060 >197807141326300 197807141812240 >197807141818060 197807142112420 >197807142127240 197807150025000 >197807150036540 197807150314120 >197807150322240 197807150438000 >197807150447000 197807150705120 >197807160107180 197807160228360 >197807160257180 197807160308180 >197807160313240 197807160313240 >197807160349480 197807160620060 >197807160629480 197807160643420 >197807160649120 197807160655060 >197807160744180 197807161122360 >197807161230060 197807161453240 >197807161512120 197807161553240 >197807161632300 197807161649240 >197807161708480 197807161809180 >197807161819240 197807161819240 >197807161826480 197807161826480 >197807161832540 197807161832540 >197807161838360 197807161842300 >197807161905240 197807162100000 >197807162113120 197807162245240 >197807162300300 197807162309120 >197807162318240 197807162357180 >197807170012000 197807170029300 >197807170035000 197807170044180 >197807170051240 197807170153000 >197807170201300 197807170232000 >197807170249480 197807170502240 >197807170524300 197807170638240 >197807170646480 197807170655480 >197807170713300 197807170749180 >197807170851300 197807171023480 >197807171515480 197807171555540 >197807171617240 197807171722240 >197807171737180 197807172036540 >197807180056300 197807180103180 >197807180109120 197807180541120 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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_89-167/854.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:16 2021