l977ar.m77t - MGD77 data file for Geophysical data from field activity L-9-77-AR in Arctic from 08/25/1977 to 10/08/1977

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Frequently anticipated questions:

What does this data set describe?

Title:
l977ar.m77t - MGD77 data file for Geophysical data from field activity L-9-77-AR in Arctic from 08/25/1977 to 10/08/1977
Abstract:
Single-beam bathymetry, magnetics, and gravity data along with transit satellite navigation data was collected as part of field activity L-9-77-AR in Arctic from 08/25/1977 to 10/08/1977, http://walrus.wr.usgs.gov/infobank/l/l977ar/html/l-9-77-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/l/l977ar/html/l-9-77-ar.bath.html http://walrus.wr.usgs.gov/infobank/l/l977ar/html/l-9-77-ar.grav.html http://walrus.wr.usgs.gov/infobank/l/l977ar/html/l-9-77-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, l977ar.m77t - MGD77 data file for Geophysical data from field activity L-9-77-AR in Arctic from 08/25/1977 to 10/08/1977: 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: -168.62703
    East_Bounding_Coordinate: -140.86696
    North_Bounding_Coordinate: 72.76758
    South_Bounding_Coordinate: 64.48080
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 25-Aug-1977
    Ending_Date: 08-Oct-1977
    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?
    l977ar.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for l977ar (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:19770826
    Maximum:19771008
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.966
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:64.48107
    Maximum:72.76758
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-168.62703
    Maximum:-140.86706
    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:0.025
    Maximum:4.348
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:18.8
    Maximum:3203
    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:57769
    Maximum:58382
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:57764
    Maximum:58378
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-186.1
    Maximum:206.5
    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:982257.1
    Maximum:982808
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-32.3
    Maximum:27.6
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-7.8
    Maximum:9.1
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:702
    Maximum:783
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:40
    Maximum:5350
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    Bathymetry, magnetic, gravity, and navigation data for U.S. Geological Survey survey l977ar in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation, gravity, magnetics 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, 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: 22-Jan-1996 (process 1 of 7)
    Navigation Data >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L977AR.N]L977AR.011; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 2 of 7)
    Gravity Data >10/31/1998 /tiger/l/l977ar/grav/l-9-77-ar.161_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >12/23/85 BARB DUA0:[DATA.L977AR.G]L977AR.161; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L977AR.N]L977AR.011; >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: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 21-Jun-2012 (process 3 of 7)
    Magnetics Data >06/21/2012 carolyn l-9-77-ar.260_011 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM >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/l977ar/mag/l-9-77-ar.240_011 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/30/86 CAROLYN DUA0:[DATA.L977AR.M]L977AR.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >241/0522-241/1321 was f.1 from Clint >245/1818-246/0028 was f.2 from Clint >246/0151-249/0316 was f.3 from Clint > >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L977AR.N]L977AR.011; >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: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 4 of 7)
    Bathymetry Data >10/31/1998 /tiger/l/l977ar/bath/l-9-77-ar.335_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/10/86 BECKIE DUA0:[DATA.BECKIE]L977AR.335; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >This file was hand-digetized in 2-way traveltime(secs) >No Matthews area was used in reduction and velocity of >sound assumed was 1500m/sec. > >03/10/86 BECKIE DUA0:[DATA.BECKIE]L977AR.310; >DRB0:[DRS.NGDC]UNREFNGDC.EXE; > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L977AR.N]L977AR.011; >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: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (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-9-77-ar.011 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197708251801500 197709280856300 >197709280920300 197709281141500 >197709281221300 197709281403500 >197709281440100 197709282358200 >197709290036000 197709300054200 >197709300156300 197710011507400 >197710012230200 197710012323400 >197710020013000 197710020700200 >197710020720400 197710030420300 >197710030500300 197710030515500 >197710030627100 197710030719100 >197710030816300 197710031224000 >197710031252000 197710040610000 >197710040710000 197710050718200 >197710050738400 197710050738400 >197710050804200 197710050821400 >197710050914200 197710050914200 >197710050938200 197710051022200 >197710051116000 197710051116000 >197710051230000 197710051244200 >197710051308200 197710051313400 >197710051404200 197710051404200 >197710051512400 197710051544000 >197710052330000 197710060010000 >197710060034000 197710060720000 >197710060750000 197710070517000 >197710070540400 197710071348000 >197710071410000 197710071756000 >197710071820000 197710071942000 >197710072106000 197710080720100 >197710080744500 197710081704300 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-9-77-ar.161_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197708251804300 197708251926300 >197708251953300 197708252102300 >197708252109480 197708252200120 >197708252216120 197708252257120 >197708252306120 197708260648120 >197708260656120 197708260853120 >197708260922120 197708261540120 >197708261731120 197708270629120 >197708270722180 197708271813120 >197708271825120 197708281817120 >197708281824120 197708281825120 >197708281840120 197708281840120 >197708281907300 197708282142300 >197708282221420 197708290235420 >197708290303180 197708290446180 >197708290505180 197708290811180 >197708290819180 197708290857180 >197708290903300 197708291304420 >197708291345420 197708291439420 >197708310050300 197708310349300 >197708310402300 197708310432300 >197708310438300 197708310438300 >197708310504300 197708310504300 >197708310513300 197708310605300 >197708310614300 197708310724300 >197708310831300 197708311130300 >197708311139300 197708311419300 >197708311425300 197708311425300 >197708311534300 197708311534300 >197708311644300 197708311707300 >197708311715300 197708311821300 >197708311828300 197708312255480 >197708312345480 197709010406480 >197709010429480 197709010640480 >197709010651480 197709011457480 >197709011602480 197709012037480 >197709012044480 197709022113000 >197709022119000 197709030007000 >197709030102000 197709030243000 >197709031002480 197709031116480 >197709031137480 197709031358480 >197709031432480 197709031433480 >197709031503480 197709031621480 >197709031637480 197709031711480 >197709031737480 197709031838480 >197709031844480 197709032327480 >197709040003000 197709040043000 >197709040055000 197709040239000 >197709040245540 197709040310120 >197709040318120 197709040321120 >197709040330120 197709042140300 >197709042200000 197709050209300 >197709050219300 197709051148420 >197709051158420 197709051203420 >197709051215420 197709051215420 >197709051225420 197709051234420 >197709051241420 197709051248420 >197709051300420 197709060028180 >197709060216480 197709060557180 >197709060605300 197709071608000 >197709071821000 197709071940000 >197709071950000 197709072337000 >197709072346420 197709081054420 >197709081101420 197709090113480 >197709090142480 197709091602480 >197709091712480 197709092057480 >197709092151480 197709092251480 >197709092258480 197709100258000 >197709100518000 197709101243120 >197709101543120 197709102055120 >197709102112120 197709102358120 >197709110133120 197709110345120 >197709110406120 197709110555120 >197709110626120 197709110705120 >197709110801120 197709111518120 >197709111835000 197709112130000 >197709112141000 197709112237000 >197709112243000 197709112358000 >197709120109000 197709120420000 >197709120741000 197709120911180 >197709121000420 197709121640420 >197709121706420 197709121754420 >197709121800420 197709121827480 >197709121910480 197709122306480 >197709122313480 197709132006480 >197709132021480 197709132045480 >197709132051480 197709132051480 >197709132105480 197709132154480 >197709140001120 197709140316120 >197709140427120 197709140900120 >197709140908120 197709141243120 >197709141323120 197709141530120 >197709141539120 197709142001120 >197709142012120 197709150203120 >197709150212120 197709150229120 >197709150237120 197709150244120 >197709150253120 197709150254120 >197709150301120 197709150304120 >197709150313120 197709151048120 >197709151117120 197709151241120 >197709151250120 197709151757180 >197709151803180 197709151852300 >197709151952300 197709161000120 >197709161016120 197709161113120 >197709161148120 197709161355120 >197709161409120 197709162028180 >197709200603180 197709200840300 >197709200846000 197709200859000 >197709200909120 197709200910120 >197709200918480 197709201143480 >197709201151480 197709201637480 >197709201722480 197709220257000 >197709220643000 197709221451000 >197709221504000 197709222346000 >197709230156000 197709231258120 >197709231348120 197709231425120 >197709231431120 197709231433120 >197709231439120 197709231538120 >197709231649120 197709232248120 >197709232300420 197709240219420 >197709240245420 197709240310420 >197709240316300 197709240323300 >197709240332300 197709241032300 >197709241122300 197709250448300 >197709250456300 197709250717300 >197709250724300 197709251240420 >197709251252420 197709251309420 >197709251316420 197709251342420 >197709251522420 197709252024420 >197709260326060 197709262005060 >197709262031060 197709271558180 >197709271617180 197709271630180 >197709271651180 197709271933180 >197709271940180 197709272327180 >197709272337180 197709281033300 >197709281128300 197709281337300 >197709281346300 197709282358420 >197709290008420 197709290841180 >197709290901180 197709291505300 >197709291514300 197709291518300 >197709291527300 197709291527300 >197709291533300 197709292146300 >197709292153300 197709292203300 >197709292229300 197709292330300 >197709292352000 197709301057180 >197709301206060 197709302318060 >197710010203060 197710011332180 >197710012333000 197710020003000 >197710020203000 197710020348000 >197710020417000 197710020643000 >197710020803000 197710021733000 >197710021808000 197710030258060 >197710030328060 197710030443060 >197710030643060 197710030803060 >197710030903060 197710031107060 >197710031112540 197710031148000 >197710031155000 197710031155000 >197710031205000 197710031207000 >197710031342000 197710031345000 >197710031354000 197710031506000 >197710031514000 197710040748000 >197710041003000 197710050048180 >197710050124180 197710050720180 >197710060116000 197710060213000 >197710060221000 197710060715000 >197710060721000 197710061228000 >197710061252000 197710061428000 >197710061513000 197710061900000 >197710061911000 197710070545000 >197710070552000 197710070700000 >197710070841000 197710071128000 >197710071433000 197710080249000 >197710080257000 197710080447060 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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_89-167/1317.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:53 2021