l476wg.m77t - MGD77 data file for Geophysical data from field activity L-4-76-WG in Western Gulf of Alaska from 06/26/1976 to 07/25/1976

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Frequently anticipated questions:

What does this data set describe?

Title:
l476wg.m77t - MGD77 data file for Geophysical data from field activity L-4-76-WG in Western Gulf of Alaska from 06/26/1976 to 07/25/1976
Abstract:
Single-beam bathymetry, magnetics, gravity data along with DGPS navigation data was collected as part of field activity L-4-76-WG in Western Gulf of Alaska from 06/26/1976 to 07/25/1976, http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.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/l476wg/html/l-4-76-wg.bath.html, http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l476wg/html/l-4-76-wg.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, l476wg.m77t - MGD77 data file for Geophysical data from field activity L-4-76-WG in Western Gulf of Alaska from 06/26/1976 to 07/25/1976: 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: -154.37817
    East_Bounding_Coordinate: -124.60397
    North_Bounding_Coordinate: 59.09326
    South_Bounding_Coordinate: 48.45923
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 26-Jun-1976
    Ending_Date: 25-Jul-1976
    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: Western Gulf of 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?
    l476wg.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L476WG (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:19760626
    Maximum:19760725
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.133
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:48.45923
    Maximum:59.09326
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-154.37818
    Maximum:-124.60397
    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:0.031
    Maximum:6.74
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:23.2
    Maximum:5055
    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:53064
    Maximum:58706.7
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:51714.3
    Maximum:58671
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-746.5
    Maximum:3323.2
    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:980968
    Maximum:981897.5
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-45
    Maximum:27.1
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-12.9
    Maximum:12.1
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:TRN
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:6044
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    single-beam bathymetry, gravity, and magnetics data for U.S. Geological Survey bathymetry survey L476WG 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?
    Roland Von Huene (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. > >01/31/86 KAYE DUA0:[DATA.L476WG.N]L476WG.012; >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/l476wg/grav/l-4-76-wg.162_012 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >04/26/88 BECKIE DUA0:[DATA.L476WG]L476WG.162; >DUA0:[DRS.EDIT]SKIPNSAVE.EXE;1 >Free Air Anomaly data > >04/25/88 BECKIE DUA0:[DATA.L476WG]L476WG.162; >DUA0:[DRS.GRV]GRAVRED.EXE;4 >Free Air Anomaly data > >12/24/85 BARB DUA0:[DATA.L476WG.G]L476WG.140; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >04/25/88 BECKIE DUA0:[DATA.L476WG]L476SKP.112; >DUA0:[DRS.EDIT]SKIPNSAVE.EXE;1 >Raw gravity data from analog meter > >01/16/85 BARB DUA0:[DATA.L476WG.G]L476WG.112 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >have only the gravity values for cruise starting at 1781300000 > >03/07/88 BECKIE DUA0:[DATA.L476WG]L476WG.071; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >03/07/88 BECKIE DUA0:[DATA.L476WG]L476WG.070; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >01/31/86 KAYE DUA0:[DATA.L476WG.N]L476WG.012; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L476WG.N]L476WG.012; >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-4-76-wg.260_012 > >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/l476wg/mag/l-4-76-wg.240_012 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >02/07/86 CAROLYN DRS$DATA:[L476WG.M]L476WG.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >179/2136-180/0553 was f.1 from Clint >180/0553-180/2310 was L476WG1.DRKPB1.MAGSD1 on TAM376 > L476WG1240.DAT on VAM376 >180/2310-183/0054 was f.2 from Clint >183/0105-183/0939 was f.3 from Clint >183/1423-184/0059 was f.4 from Clint >184/0059-186/0612 was f.5 from Clint >186/0648-189/0928 was f.6 from Clint >189/1343-192/0459 was f.7 from Clint >192/0459-205/0330 was L476WG2.DRCPF1.MAGSD1 on TAM376 > L476WG2240.DAT on VAM376 > >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L476WG.N]L476WG.012; >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/l476wg/bath/l-4-76-wg.335_012 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/11/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L476WG.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >It ws reduced using no Matthews correction and the >velocity of sound assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/31/86 KAYE DUA0:[DATA.L476WG.N]L476WG.012; >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-4-76-wg.012 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197606260814000 197607120410000 >197607120522000 197607120522000 >197607120552000 197607120552000 >197607120708000 197607120708000 >197607120758000 197607120758000 >197607120822000 197607120822000 >197607121132000 197607121132000 >197607121154000 197607121154000 >197607121316000 197607121316000 >197607121344000 197607121344000 >197607121542000 197607121542000 >197607121728000 197607121728000 >197607121840000 197607121840000 >197607121904000 197607121920000 >197607122026000 197607122026000 >197607122256100 197607130057300 >197607130141200 197607152022300 >197607152200400 197607172011400 >197607172133300 197607180249300 >197607180436000 197607180436000 >197607180510000 197607180510000 >197607180658000 197607180658000 >197607181004400 197607200639000 >197607201158500 197607210742200 >197607210811000 197607230100000 >197607230220000 197607230220000 >197607230408000 197607230408000 >197607230550000 197607230550000 >197607230740000 197607240014100 >197607240115100 197607251419500 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-4-76-wg.162_012) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197606261250000 197606261640000 >197606261650000 197606261650000 >197606261700000 197606272330000 >197606272340000 197606272340000 >197606272350000 197606280040000 >197606280050000 197606280050000 >197606280100000 197606282350000 >197606290000000 197606290000000 >197606290010000 197606290300000 >197606290400000 197606290815000 >197606290840000 197606291045000 >197606291115000 197606291220000 >197606291230000 197606291230000 >197606291240000 197606291245000 >197606291255000 197606291255000 >197606291305000 197606291540000 >197606291605000 197606291840000 >197606291950000 197606300250000 >197606300315000 197606302215000 >197606302225000 197606302225000 >197606302235000 197607010040000 >197607010120000 197607010130000 >197607010140000 197607010140000 >197607010150000 197607010910000 >197607010920000 197607010920000 >197607010930000 197607022055000 >197607022130000 197607022225000 >197607022300000 197607030800000 >197607030830000 197607031515000 >197607031525000 197607031600000 >197607031630000 197607031735000 >197607031800000 197607040355000 >197607040810000 197607041110000 >197607041120000 197607041120000 >197607041130000 197607041200000 >197607041225000 197607041435000 >197607041655000 197607042220000 >197607042250000 197607042320000 >197607050000000 197607050850000 >197607050950000 197607051745000 >197607051755000 197607051755000 >197607051805000 197607051845000 >197607051910000 197607060200000 >197607060240000 197607061815000 >197607061825000 197607061825000 >197607061835000 197607070555000 >197607070710000 197607071050000 >197607071130000 197607071325000 >197607071335000 197607071335000 >197607071345000 197607071615000 >197607071720000 197607072350000 >197607080035000 197607081030000 >197607081150000 197607081340000 >197607111806500 197607111810500 >197607112230400 197607112326400 >197607120130400 197607120351400 >197607120359000 197607120400200 >197607120408400 197607120410400 >197607120417200 197607122029400 >197607122051400 197607122053000 >197607122142200 197607122226200 >197607122236400 197607122236400 >197607122246100 197607130037300 >197607130131200 197607141010400 >197607141017400 197607141020400 >197607141027300 197607152003100 >197607152149000 197607161017000 >197607161026200 197607161027000 >197607161036100 197607180230300 >197607180519000 197607180523000 >197607180630200 197607200620400 >197607200627000 197607200630000 >197607200655100 197607200655100 >197607201050500 197607210954000 >197607211002000 197607211004000 >197607211012000 197607230340200 >197607230412000 197607232330200 >197607232336200 197607232340200 >197607232346100 197607251351100 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-4-76-wg.260_012) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197606272136050 197607010054420 >197607010105420 197607010939270 >197607011423140 197607012041540 >197607012100000 197607012327460 >197607012334460 197607021615560 >197607021635080 197607040612240 >197607040648030 197607050752400 >197607050800170 197607050800220 >197607051015570 197607052345120 >197607060217060 197607070928150 >197607071343540 197607080807210 >197607121030000 197607132200000 >197607132250000 197607150436000 >197607150540000 197607180250000 >197607180326000 197607180500000 >197607180642000 197607180952000 >197607181008000 197607182250000 >197607182306000 197607191630000 >197607191636000 197607210500000 >197607210506000 197607221434000 >197607221510000 197607230330000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-4-76-wg.335_012) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197606261100180 197606262301360 >197606262350240 197606270058420 >197606270300300 197606271358360 >197606271415240 197606271928480 >197606271944060 197606271953240 >197606272006120 197606280214000 >197606280233240 197606280619060 >197606280629180 197606280629180 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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_89-167/852.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:16 2021