l582sp.m77t - MGD77 data file for Geophysical data from field activity L-5-82-SP in Tonga Ridge, Southern Pacific from 03/28/1982 to 04/25/1982

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
l582sp.m77t - MGD77 data file for Geophysical data from field activity L-5-82-SP in Tonga Ridge, Southern Pacific from 03/28/1982 to 04/25/1982
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-5-82-SP in Tonga Ridge, Southern Pacific from 03/28/1982 to 04/25/1982, http://walrus.wr.usgs.gov/infobank/l/l582sp/html/l-5-82-sp.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/l582sp/html/l-5-82-sp.bath.html, http://walrus.wr.usgs.gov/infobank/l/l582sp/html/l-5-82-sp.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l582sp/html/l-5-82-sp.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, l582sp.m77t - MGD77 data file for Geophysical data from field activity L-5-82-SP in Tonga Ridge, Southern Pacific from 03/28/1982 to 04/25/1982: 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: 168.41679
    East_Bounding_Coordinate: -170.74139
    North_Bounding_Coordinate: -14.43070
    South_Bounding_Coordinate: -23.47230
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 28-Mar-1982
    Ending_Date: 25-Apr-1982
    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: Tonga Ridge, Southern Pacific
      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?
    l582sp.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L582SP (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:19820328
    Maximum:19820425
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.766
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-23.47611
    Maximum:-14.27442
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-179.99886
    Maximum:179.99877
    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:0.006
    Maximum:13.92
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:4.5
    Maximum:10805
    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:40218
    Maximum:51193.8
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-630.1
    Maximum:6832.1
    Units:gammas
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:978265.8
    Maximum:979057.6
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-84.6
    Maximum:67.5
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-319.4
    Maximum:26.7
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:3
    Maximum:18
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:50
    Maximum:6590
    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 L582SP 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?
    Dave Scholl (Chief Scientist, USGS)
  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. > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.072; >DUA0:[DRS.EDIT]MERGEIT.EXE;3 >Eotvos/course/speed/distance data >taking eotvos field from L582SP.GRVSH3 > >Input was... >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.071; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.055; >DUA0:[DRS.REFMT]REFORMAT.EXE; >Integrated navigation (SINS) data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >Input was... >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > 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/l582sp/grav/l-5-82-sp.153_072 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.153; >DUA0:[DRS.REFMT]REFORMAT.EXE; >SKIPNSAVED Free Air Anomaly data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >Input was... >Converted to time format with year at start. > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.072; >DUA0:[DRS.EDIT]MERGEIT.EXE;3 >Eotvos/course/speed/distance data >taking eotvos field from L582SP.GRVSH3 > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.071; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.055; >DUA0:[DRS.REFMT]REFORMAT.EXE; >Integrated navigation (SINS) data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 20-Jun-2012 (process 3 of 7)
    Magnetics Data >06/20/2012 carolyn l-5-82-sp.223_072 > >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/magred1111/magred1111.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/l582sp/mag/l-5-82-sp.222_072 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >06/22/88 CAROLYN DRS$DATA:[L582SP.M]L582SP.222; >DUA0:[DRS.PLT]GRAPHED.EXE; >Edited magnetics data >edited out spikes by hand > >06/21/88 CAROLYN DRS$DATA:[L582SP.M]L582SP.221; >DUA0:[DRS.NGDC]DESPIKE.EXE; >Edited magnetics data >deleted recs w/ +/-3000.0 gamma residuals > >06/20/88 CAROLYN DRS$DATA:[L582SP.M]L582SP.220; >DUA0:[DRS.MAG]MAGRED.EXE;5 >Edited magnetics data > >12/04/85 CAROLYN DRS$DATA:[L582SP.M]L582SP220.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was L582SP._.MAGSB1 on TAM369 >was L582SP220.DAT on VAM369 > >10/20/86 BECKIE DUA0:[DATA.L384SP]L582SP.070; >DUA0:[DRS.NAV]EOTCSSP.EXE; > >04/17/85 KAYE USR$DISK:[KAYE.MISCLEE]L582SP.050; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;4 > Data adjusted in March 1985 to match 1984 data. > >Converted to time format with year at start. > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.072; >DUA0:[DRS.EDIT]MERGEIT.EXE;3 >Eotvos/course/speed/distance data >taking eotvos field from L582SP.GRVSH3 > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.071; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.055; >DUA0:[DRS.REFMT]REFORMAT.EXE; >Integrated navigation (SINS) data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >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/l582sp/bath/l-5-82-sp.331_072 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >06/23/88 CAROLYN DRS$DATA:[L582SP.B]L582SP.331; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >Edited bathymetry data > >06/12/85 BECKIE USR$DISK:[DRS.DATA.L582SP.B]L582SP.330; >DRA1:[DRS.BAT]BATRED.EXE;1 >This file is hand-digetized bathymetry in 2-way seconds. >Calculated depth assumes travel-time of sound in water >at 1500M/sec. > >Input was... >Converted to time format with year at start. > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.072; >DUA0:[DRS.EDIT]MERGEIT.EXE;3 >Eotvos/course/speed/distance data >taking eotvos field from L582SP.GRVSH3 > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.071; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.055; >DUA0:[DRS.REFMT]REFORMAT.EXE; >Integrated navigation (SINS) data > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >07/01/88 CAROLYN DRS$DATA:[L582SP.G]L582SP.GRVSH3; >DUA0:[DRS.PLT.GRAPHED]GRAPHED.EXE; >SKIPNSAVED Free Air Anomaly data >hand edited out spikes in FAA field >original time/lat/lon/eot/obsgrv/theogrv/faa data from running >EOTCOR on DISCO::[JON.TAPE.LISTS]L582SP.GRVSH1 w/ EOTCOR.DAT > >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-5-82-sp.072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203281231420 198204240129180 >198204240155240 198204241108540 >198204241134480 198204241610480 >198204241707480 198204242201240 >198204242316300 198204252032180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-5-82-sp.153_072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203281231420 198203281928420 >198203281950420 198203282025000 >198203282048000 198203282106000 >198203282148000 198203290036300 >198203290136300 198203290242300 >198203290300300 198203291154300 >198203291215060 198203291525300 >198203291722420 198203300112420 >198203300432240 198203300700240 >198203300729300 198203301827180 >198203301847180 198203302132480 >198204020222000 198204020252000 >198204020335000 198204020535000 >198204020615000 198204022010540 >198204022042540 198204030000540 >198204030006180 198204030904240 >198204031029360 198204031300360 >198204031342360 198204031940180 >198204032013180 198204032153240 >198204032253360 198204032354360 >198204040042420 198204040736540 >198204040912540 198204042052540 >198204042141060 198204050023240 >198204050049540 198204050224540 >198204050303540 198204050355540 >198204050402540 198204051140540 >198204051337540 198204052300360 >198204052314360 198204052334360 >198204052342240 198204060124240 >198204060137060 198204060217180 >198204060323180 198204061641000 >198204061701060 198204061853180 >198204061905000 198204062007180 >198204062140240 198204070116540 >198204070133540 198204070151540 >198204070157060 198204071444300 >198204071558300 198204071930360 >198204072313000 198204080153180 >198204080237000 198204080355000 >198204080407000 198204080511000 >198204080548060 198204080822060 >198204080858060 198204080914060 >198204080948060 198204081800420 >198204081902420 198204082124420 >198204082146300 198204090254420 >198204090301000 198204092140000 >198204092153000 198204092257180 >198204092308180 198204092354180 >198204100001480 198204100648420 >198204100757420 198204110624360 >198204110719360 198204110824360 >198204110942360 198204111225000 >198204111307540 198204111400000 >198204111427540 198204112206540 >198204112304480 198204120926240 >198204120958240 198204121236240 >198204121408240 198204121418240 >198204121424240 198204121514240 >198204121526240 198204122331240 >198204122337240 198204122337240 >198204122343240 198204130113240 >198204130240480 198204130910480 >198204130953480 198204131424360 >198204131509360 198204131952360 >198204132152000 198204132234000 >198204140125240 198204140341300 >198204140450420 198204140828420 >198204141048420 198204141158420 >198204141412420 198204141506420 >198204150055120 198204150125180 >198204150155120 198204150243180 >198204150305180 198204150325180 >198204150355180 198204150437180 >198204151206420 198204151350420 >198204151414420 198204151436420 >198204151826420 198204152254420 >198204160113420 198204160123420 >198204160142240 198204160226420 >198204160352420 198204160554420 >198204160736420 198204160754420 >198204161111420 198204161406420 >198204161441420 198204161554420 >198204161716420 198204161836420 >198204161918420 198204162254420 >198204162300300 198204170001000 >198204170006060 198204170040060 >198204170130060 198204170224060 >198204170234240 198204170852300 >198204170940360 198204171502360 >198204171623360 198204171658000 >198204171756000 198204171854000 >198204171902000 198204172224180 >198204172242360 198204172246360 >198204172251540 198204180942480 >198204181018480 198204181758180 >198204181842180 198204190142300 >198204190154120 198204190426300 >198204190520300 198204190658300 >198204190716300 198204191118360 >198204191154360 198204191630420 >198204191721000 198204191937180 >198204230427180 198204230631180 >198204230715180 198204230845180 >198204230913180 198204231141180 >198204231203180 198204231337180 >198204231506180 198204231552360 >198204231607060 198204231653180 >198204231715180 198204231953180 >198204232008060 198204232039000 >198204232117000 198204232154000 >198204232206240 198204240129180 >198204240155240 198204240824300 >198204240838540 198204241108540 >198204241134480 198204241610480 >198204241707480 198204242054240 >198204242110540 198204242201240 >198204242316300 198204250458540 >198204250511000 198204252032180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-5-82-sp.223_072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203282013520 198203290248520 >198203290305320 198203291159400 >198203291220160 198203291531240 >198203300359240 198203300706320 >198203300720320 198203302053480 >198204020820560 198204032200140 >198204032247340 198204040000180 >198204040029320 198204042059160 >198204042105080 198204050030220 >198204050055000 198204052341240 >198204052347240 198204060130000 >198204060142080 198204061859560 >198204061910080 198204071935560 >198204072307000 198204080200160 >198204080242000 198204080400210 >198204080412000 198204082129560 >198204082151360 198204090259560 >198204090306040 198204100000140 >198204100006520 198204112212520 >198204112259480 198204130120000 >198204130245480 198204132003080 >198204140037230 198204140100310 >198204140110110 198204140353160 >198204160248400 198204160956250 >198204161907000 198204162300270 >198204162305310 198204170052550 >198204170908530 198204171602570 >198204171717240 198204172230140 >198204172247400 198204190148360 >198204190159120 198204191635360 >198204230740160 198204231558400 >198204231612040 198204232000140 >198204232013080 198204232130040 >198204232135180 198204232200200 >198204232211240 198204232359560 >198204240005000 198204240135200 >198204240200260 198204240830000 >198204240844000 198204241114240 >198204241139480 198204242100440 >198204242115540 198204242359560 >198204250005320 198204250505480 >198204250516000 198204252032160 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-5-82-sp.331_072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203281937060 198203290016000 >198203290031060 198203290031060 >198203290045000 198203290100300 >198203290122420 198203290122420 >198203290136420 198203290205300 >198203290217360 198203290229540 >198203290245240 198203290318420 >198203290355300 198203291538180 >198203300356060 198203300734420 >198203300746420 198203300919360 >198203300929480 198203300939120 >198203300949300 198203300949300 >198203301000060 198203301631060 >198203301642480 198203302049420 >198204020230060 198204020542420 >198204020849300 198204030308300 >198204030325360 198204030610180 >198204030620420 198204031252360 >198204031303240 198204031504540 >198204031527060 198204041106120 >198204041116180 198204042159180 >198204050303540 198204051345000 >198204051357540 198204052020480 >198204052031060 198204052108240 >198204052119420 198204060217420 >198204060230300 198204060311000 >198204060350120 198204062004540 >198204062301540 198204071502240 >198204071524120 198204080449240 >198204080503420 198204100248300 >198204100258480 198204101051540 >198204101102420 198204101117000 >198204101130240 198204101240360 >198204101254120 198204101459360 >198204101517300 198204130039000 >198204130051180 198204131509240 >198204131520480 198204132008540 >198204132019120 198204132111420 >198204132122420 198204132122420 >198204132134360 198204132214060 >198204132226540 198204132226540 >198204132239060 198204132300420 >198204132312300 198204132323060 >198204132342480 198204140509300 >198204140520060 198204140520060 >198204140530240 198204140649060 >198204140700180 198204140700180 >198204140712300 198204140712300 >198204140724060 198204140730240 >198204140740540 198204140830240 >198204140841480 198204140949420 >198204141000060 198204141000060 >198204141011000 198204141011000 >198204141025060 198204141030060 >198204141044360 198204141634000 >198204141644060 198204150740060 >198204150751420 198204150751420 >198204150802420 198204150811300 >198204150823300 198204150843240 >198204150854060 198204161027480 >198204161040000 198204161040000 >198204161053360 198204161102540 >198204161119420 198204161119420 >198204161131360 198204161131360 >198204161144000 198204161144000 >198204161155000 198204161204240 >198204161216180 198204161229120 >198204161241480 198204161241480 >198204161251540 198204161256060 >198204161310420 198204161310420 >198204161325000 198204161325000 >198204161337240 198204161347060 >198204161357420 198204161358540 >198204161409420 198204170100360 >198204171007180 198204190808000 >198204190823000 198204191634300 >198204230619240 198204232352360 >198204240018000 198204240844540 >198204240905540 198204242115360 >198204242127480 198204250004480 >198204250019420 198204250143000 >198204250154360 198204250559300 >198204250628420 198204252031300 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-5-82-sp.420_072) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198204021007280 198204021037470 >198204021043470 198204021203480 >198204021209280 198204021425080 >198204021431480 198204021556280 >198204021603080 198204021646280 >198204021713080 198204022129500 >198204022139500 198204022139500 >198204022146300 198204022236100 >198204022302100 198204022342120 >198204030012120 198204030042080 >198204030052080 198204030135330 >198204030201540 198204030238350 >198204030315170 198204030348370 >198204030424180 198204030500580 >198204030537380 198204030610580 >198204030647380 198204030720580 >198204030759580 198204030906180 >198204031033380 198204031113390 >198204031120190 198204031506580 >198204031513380 198204031613370 >198204031623370 198204031700160 >198204032154340 198204040207520 >198204040214320 198204040554320 >198204041151210 198204041911210 >198204041918010 198204041918010 >198204041924410 198204042044430 >198204050131180 198204050834390 >198204050841190 198204051134420 >198204051141220 198204051244420 >198204051251220 198204051334420 >198204051400020 198204051406420 >198204051413220 198204060203220 >198204060413440 198204061413380 >198204061420180 198204061956030 >198204062147240 198204071437420 >198204071611020 198204080149410 >198204080238010 198204080958020 >198204081014420 198204081058020 >198204081121220 198204081741230 >198204081800030 198204081833230 >198204081839430 198204082303030 >198204082326230 198204090016230 >198204090029030 198204090255430 >198204090305230 198204090735230 >198204090745230 198204091105210 >198204091114210 198204091931010 >198204091936210 198204092139450 >198204092149450 198204092359460 >198204100006130 198204100006130 >198204100023060 198204100106270 >198204100116470 198204100636480 >198204100752060 198204100854080 >198204100903480 198204110603410 >198204110716160 198204110842560 >198204110957160 198204111130560 >198204111137360 198204111137360 >198204111150560 198204111614160 >198204111624160 198204111624160 >198204111634160 198204120137360 >198204120153360 198204120403370 >198204120410170 198204120410170 >198204120416570 198204120453370 >198204120510170 198204120546570 >198204120954370 198204121111210 >198204121118010 198204121254410 >198204121309220 198204130132410 >198204130142410 198204130222410 >198204130229210 198204130229210 >198204130256010 198204130332410 >198204130409210 198204130449210 >198204130526010 198204130606010 >198204130639210 198204130906010 >198204130953210 198204131416440 >198204131458240 198204131641440 >198204131708240 198204131741440 >198204131811440 198204131951440 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST
  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_89-167/861.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:20 2021