l777wg.m77t - MGD77 data file for Geophysical data from field activity L-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977

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Frequently anticipated questions:


What does this data set describe?

Title:
l777wg.m77t - MGD77 data file for Geophysical data from field activity L-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977, http://walrus.wr.usgs.gov/infobank/l/l777wg/html/l-7-77-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/l777wg/html/l-7-77-wg.bath.html, http://walrus.wr.usgs.gov/infobank/l/l777wg/html/l-7-77-wg.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l777wg/html/l-7-77-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, l777wg.m77t - MGD77 data file for Geophysical data from field activity L-7-77-WG in Western Gulf of Alaska from 07/03/1977 to 07/22/1977: 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: -156.74424
    East_Bounding_Coordinate: -147.44074
    North_Bounding_Coordinate: 58.14343
    South_Bounding_Coordinate: 54.97198
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 03-Jul-1977
    Ending_Date: 22-Jul-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: 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?
    l777wg.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L777WG (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:19770703
    Maximum:19770722
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.55
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:54.97199
    Maximum:58.14342
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-156.74421
    Maximum:-147.44074
    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:0.029
    Maximum:7.348
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:21.7
    Maximum:5525
    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:52343
    Maximum:54453
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:54423
    Maximum:52167
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-522.3
    Maximum:522
    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:981176.6
    Maximum:981884.8
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-44
    Maximum:56.2
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-40.2
    Maximum:16.3
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:799
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:41
    Maximum:4195
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L777WG 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 6)
    Navigation Data >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.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 6)
    Gravity Data >10/31/1998 /tiger/l/l777wg/grav/l-7-77-wg.162_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >04/25/88 BECKIE DUA0:[DATA.L476WG]L777WG.162; >DUA0:[DRS.GRV]GRAVRED.EXE;4 >Free Air Anomaly data > >11/27/85 BARB DUA0:[DATA.L777WG.G]L777WG.140 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >0.9948 S53 > >12/23/85 BARB DUA0:[DATA.L777WG.G]L777WG.111; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >12/23/85 BARB DUA0:[DATA.L777WG.G]L777WG.111 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >04/18/88 BECKIE DUA0:[DATA.L476WG]L777WG.070; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.010; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.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 6)
    Magnetics Data >06/21/2012 carolyn l-7-77-wg.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/l777wg/mag/l-7-77-wg.240_010 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/24/86 CAROLYN DRS$DATA:[L777WG.M]L777WG.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >187/1130-189/1905 was F.1 from Clint >189/1905-203/1036 was L777WG.DRCPF1.MAGSC1 on TAM211 > was L777WG240.DAT on VAM211 >the slave values look more like regional > >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.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 6)
    Bathymetry Data >10/31/1998 /tiger/l/l777wg/bath/l-7-77-wg.335_010 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/06/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L777WG.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >It was reduced using no Matthews correction and velocity >of sound assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L777WG.N]L777WG.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 6)
    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 6)
    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
  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-7-77-wg.010 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707031548000 197707042202100 >197707042248100 197707051200500 >197707051207000 197707051316000 >197707051325400 197707052015400 >197707052025100 197707060404100 >197707060414100 197707061243200 >197707061248400 197707062228400 >197707062235200 197707070726200 >197707070736200 197707091829500 >197707091844300 197707091844300 >197707091859300 197707091859300 >197707091914300 197707091914300 >197707091929300 197707091929300 >197707091944300 197707091944300 >197707091959300 197707091959300 >197707092014300 197707092014300 >197707092029300 197707092029300 >197707092044300 197707092044300 >197707092100100 197707092144300 >197707092158100 197707100059300 >197707100104500 197707100812500 >197707100827300 197707100827300 >197707100842300 197707100842300 >197707100857300 197707100857300 >197707100912300 197707100912300 >197707100927300 197707100927300 >197707100942300 197707100942300 >197707100957300 197707100957300 >197707101012300 197707101012300 >197707101027300 197707101027300 >197707101042300 197707101042300 >197707101054200 197707101759400 >197707101824500 197707132130100 >197707132140400 197707151438300 >197707151449300 197707151624500 >197707151634300 197707170126100 >197707170232100 197707170330100 >197707170346100 197707170649300 >197707170718100 197707170802100 >197707170814100 197707171338100 >197707171346100 197707171406100 >197707171414100 197707171422100 >197707171436100 197707171522100 >197707171537000 197707171537000 >197707171552000 197707171552000 >197707171607000 197707171607000 >197707171622000 197707171622000 >197707171637000 197707171637000 >197707171652000 197707171652000 >197707171707000 197707171707000 >197707171722000 197707171722000 >197707171737000 197707171737000 >197707171752000 197707171752000 >197707171807000 197707171807000 >197707171822000 197707171822000 >197707171837000 197707171837000 >197707171854000 197707172208200 >197707172214000 197707172217000 >197707172228200 197707172331400 >197707172354000 197707181451100 >197707181527100 197707181933300 >197707181950500 197707182020500 >197707182029300 197707190540500 >197707190550300 197707190637100 >197707190643100 197707190659100 >197707190750500 197707191600100 >197707191615000 197707191615000 >197707191630000 197707191630000 >197707191645000 197707191645000 >197707191700100 197707191747300 >197707191811500 197707191928500 >197707191936100 197707192024100 >197707192030500 197707192042300 >197707192050500 197707200009100 >197707200015100 197707200134500 >197707200144300 197707200314500 >197707200324100 197707201239300 >197707201316500 197707201335500 >197707201355300 197707210117500 >197707210128100 197707210218300 >197707210227500 197707210304300 >197707210310100 197707210445100 >197707210454100 197707210546500 >197707210554100 197707210627500 >197707210646300 197707211252100 >197707211326500 197707212304300 >197707212310300 197707212358100 >197707220010200 197707221023400 >197707221031000 197707221736000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-7-77-wg.162_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707031548400 197707042156300 >197707042216100 197707051151100 >197707051157000 197707052005400 >197707052015100 197707062219000 >197707062225200 197707092134300 >197707092148100 197707100802500 >197707101034230 197707101750000 >197707101814500 197707132120100 >197707132130400 197707172207000 >197707172218200 197707212348100 >197707220000200 197707221736000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-7-77-wg.260_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707061130210 197707070005030 >197707070735000 197707080409160 >197707081118250 197707081303500 >197707081329370 197707081840220 >197707081901290 197707090408300 >197707090544060 197707092157060 >197707092209180 197707100812300 >197707101043000 197707101633000 >197707110412540 197707110413540 >197707110427300 197707111319180 >197707111550300 197707130815360 >197707130826240 197707131757300 >197707131804420 197707140450000 >197707141541420 197707150617480 >197707171000120 197707171825360 >197707221023000 197707221036180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-7-77-wg.335_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707031830000 197707032200000 >197707032340000 197707040700000 >197707040745000 197707050255000 >197707050310000 197707050455000 >197707050719000 197707050805000 >197707050820000 197707060005000 >197707060025000 197707060225000 >197707061100000 197707061650000 >197707061705000 197707061720000 >197707061740000 197707061747000 >197707061830000 197707070330000 >197707070600000 197707071345000 >197707071410000 197707071720000 >197707071736000 197707072030000 >197707072055000 197707081010000 >197707081030000 197707090320000 >197707090345000 197707090400000 >197707090415000 197707090645000 >197707090710000 197707090820000 >197707090855000 197707092300000 >197707092320000 197707100715000 >197707100730000 197707101630000 >197707101910000 197707111215000 >197707111230000 197707130150000 >197707130210000 197707140710000 >197707140730000 197707142140000 >197707142155000 197707150041480 >197707150054420 197707150108480 >197707150120360 197707150153480 >197707150213480 197707150213480 >197707150225000 197707150243360 >197707150256120 197707150309120 >197707150320300 197707150329540 >197707150340000 197707150340000 >197707150353180 197707150939300 >197707150950000 197707151050000 >197707151110000 197707151110000 >197707151217540 197707151217540 >197707151230000 197707151236000 >197707151257240 197707151257240 >197707151322540 197707151329540 >197707151341300 197707160456480 >197707160507060 197707160507060 >197707160520000 197707160745300 >197707160801180 197707160801180 >197707191000000 197707191445000 >197707191500000 197707191920000 >197707191940000 197707200100000 >197707200115000 197707200210000 >197707200230000 197707200235000 >197707200250000 197707200327000 >197707200340000 197707200410000 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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: 01-Feb-2017
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/873.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:43:21 2018