l580aa.m77t - MGD77 data file for Geophysical data from field activity L-5-80-AA in Aleutian Arc, Alaska from 06/23/1980 to 07/05/1980

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Frequently anticipated questions:

What does this data set describe?

Title:
l580aa.m77t - MGD77 data file for Geophysical data from field activity L-5-80-AA in Aleutian Arc, Alaska from 06/23/1980 to 07/05/1980
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-5-80-AA in Aleutian Arc, Alaska from 06/23/1980 to 07/05/1980, http://walrus.wr.usgs.gov/infobank/l/l580aa/html/l-5-80-aa.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/l580aa/html/l-5-80-aa.bath.html, http://walrus.wr.usgs.gov/infobank/l/l580aa/html/l-5-80-aa.grav.html , and http://walrus.wr.usgs.gov/infobank/l/l580aa/html/l-5-80-aa.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, l580aa.m77t - MGD77 data file for Geophysical data from field activity L-5-80-AA in Aleutian Arc, Alaska from 06/23/1980 to 07/05/1980: 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: -175.00967
    East_Bounding_Coordinate: -152.03867
    North_Bounding_Coordinate: 57.78194
    South_Bounding_Coordinate: 50.48417
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 23-Jun-1980
    Ending_Date: 05-Jul-1980
    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: Aleutian Arc, 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?
    l580aa.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L580AA (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:19800623
    Maximum:19800705
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.9
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:50.48417
    Maximum:57.78191
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-175.00967
    Maximum:-152.03872
    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:0.1
    Maximum:9.65
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:75
    Maximum:7329.5
    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:47559
    Maximum:51819.7
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-539.2
    Maximum:577.5
    Units:gammas
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:980946.1
    Maximum:981439.5
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-52
    Maximum:51.3
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-264.8
    Maximum:163.8
    Units:milligals
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L580AA 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)
  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. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.L580AA]L580AA.052; >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/l580aa/grav/l-5-80-aa.151_052 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >10/24/85 BARB DRS$DATA:[L580AA.G]L580AA.151; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >Input was... >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.L580AA]L580AA.052; >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 3 of 7)
    Magnetics Data >06/20/2012 carolyn l-5-80-aa.220_052 > >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/l580aa/mag/l-5-80-aa.200_052 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >10/10/85 CAROLYN DRS$DATA:[L580AA.M]L580AA.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >1st part (177/0302-177/2357) >was L580AA._.MAGAA1 on TAM349 >was L580AA._.MAGSC1 on TAM059 >was L580AA200.DAT on VAM349 >2nd part (177/2357-187/1000) >was L580AA._.MAGSA1 on TAM059 >was L580AA200.DAT on MAM059 >3rd part (179/1531-180/1600) >4th part (183/0428-185/0000) >was L580AA.SATSX1.MAGSD1 on TAM209 >was L580AA.SATSX1.MAGSX1 on TAM349 >was L580AA240.DAT on MAM209 >5th part (185/0000-185/0700) >was L580AA.SATSX1.MAGSX1 on TAM349 >was L580AA260.DAT on VAM349 > >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.L580AA]L580AA.052; >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/l580aa/bath/l-5-80-aa.336_052 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >04/21/86 BECKIE DUA0:[DATA.L580AA.B]L580AA.336; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >This file was hand-digetized in 2-way traveltime(secs). >This file supercedes l580aa.335. It came from a tape >from GMchendrie, file called l580aa.360. > >Input was... >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.L580AA]L580AA.052; >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-5-80-aa.052 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198006232050000 198007040152000 >198007040324000 198007040324000 >198007040530000 198007040530000 >198007040626000 198007040626000 >198007040652000 198007040652000 >198007040806000 198007040806000 >198007040840000 198007040840000 >198007040952000 198007040952000 >198007041028000 198007041028000 >198007041210000 198007041210000 >198007041440000 198007041440000 >198007041550000 198007041626000 >198007041910000 198007041910000 >198007042056000 198007042056000 >198007042126000 198007042126000 >198007042318000 198007042318000 >198007050016000 198007050016000 >198007050100000 198007050100000 >198007050202000 198007050202000 >198007050246000 198007050246000 >198007050414000 198007050434000 >198007050600000 198007050600000 >198007050718000 198007050718000 >198007050754000 198007050754000 >198007050936000 198007050936000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-5-80-aa.151_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198006241749300 198006251202300 >198006251504300 198006260424300 >198006260623300 198006262337300 >198006262343300 198006270704300 >198006271127300 198006271839300 >198006271940300 198006272219300 >198006272332300 198006280228300 >198006281531300 198006281741300 >198006281901300 198006282057300 >198006282355300 198006290035300 >198006290100000 198006290257300 >198006290346300 198006290457300 >198006290514300 198006290654300 >198006290721300 198006290852300 >198006290900300 198006291057300 >198006291104300 198006291120300 >198006291127300 198006300234300 >198006300310300 198006300633300 >198006300722300 198006300901300 >198006300934300 198006301853300 >198006301901300 198006302054300 >198006302254300 198007010054300 >198007012321300 198007020307300 >198007020438300 198007020815300 >198007020853300 198007021020300 >198007021250300 198007030141300 >198007030301300 198007030731300 >198007030942300 198007040111300 >198007040447300 198007041757300 >198007042326300 198007050832300 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-5-80-aa.220_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198006250302020 198006271008000 >198006271023000 198006280939480 >198006281600000 198006282110300 >198006291500000 198006300100000 >198006300107000 198006300517000 >198006300535000 198007040113300 >198007040437000 198007041937000 >198007042309000 198007050936000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-5-80-aa.336_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198006241830120 198006241910480 >198006241918300 198006242316300 >198006242325540 198006250005180 >198006250021060 198006250139480 >198006250145300 198006250205420 >198006250211540 198006250312540 >198006250323180 198006250609180 >198006250614300 198006250754300 >198006250800120 198006250912480 >198006250919240 198006251011420 >198006251024360 198006251231420 >198006251248120 198006251253540 >198006251259120 198006251302120 >198006251308060 198006251310060 >198006251318480 198006260128360 >198006260142180 198006260408360 >198006260418000 198006260432000 >198006270105360 198006270230060 >198006270239240 198006270446360 >198006270457360 198006270823180 >198006270833480 198006270839480 >198006270845120 198006270845120 >198006270850240 198006270956300 >198006271012000 198006271326420 >198006271334000 198006271801240 >198006271806540 198006272222240 >198006272247540 198006280044540 >198006280050540 198006280552540 >198006280602000 198006280623240 >198006280633420 198006280633420 >198006280640480 198006280652420 >198006280709240 198006280721120 >198006280727180 198006280727180 >198006280739240 198006280739240 >198006280745540 198006280907420 >198006280915300 198006280915300 >198006280921000 198006280925240 >198006281610360 198006290700000 >198006290705540 198006290844360 >198006290853240 198006290853240 >198006290900180 198006290900180 >198006290911300 198006290921300 >198006290933300 198006290937000 >198006290944000 198006290953000 >198006291000240 198006291049180 >198006291115000 198006291352120 >198006291359120 198006291359120 >198006291405180 198006291407060 >198006291413000 198006291426540 >198006291432180 198006291516060 >198006291521540 198006291617120 >198006291623060 198006291625000 >198006291630360 198006292210240 >198006292215540 198006292219360 >198006292226180 198006292317000 >198006292344120 198006292350180 >198006292359240 198006300009060 >198006300019480 198006300019480 >198006300035060 198006300035060 >198006300040120 198006300101360 >198006300107120 198006300111180 >198006300116540 198006300141540 >198006300147120 198006300242540 >198006300249420 198006300307540 >198006300314360 198006300323000 >198006300328480 198006300509300 >198006300522480 198006300600000 >198006300606240 198006300641120 >198006300648000 198006300652540 >198006300659180 198006300708540 >198006300714360 198006301127060 >198006301133180 198006301322000 >198006301330540 198006301330540 >198006301340060 198006301412180 >198006301417480 198006301502540 >198006301508000 198006301849120 >198006301859120 198007010342120 >198007010347240 198007010459540 >198007010508000 198007012258060 >198007012304120 198007012335060 >198007012341540 198007012341540 >198007012351300 198007020009420 >198007020040120 198007020104480 >198007020109540 198007020147300 >198007020208300 198007020229420 >198007020242540 198007020315120 >198007020445060 198007020506240 >198007020514060 198007020857120 >198007020906480 198007020906480 >198007020917180 198007020921420 >198007020929240 198007021206060 >198007021213060 198007021213060 >198007021219060 198007021322120 >198007021327180 198007021327180 >198007021332360 198007021346300 >198007021359120 198007021926540 >198007021935480 198007022252240 >198007022259060 198007022259060 >198007022307420 198007030857300 >198007030904060 198007030909300 >198007030919180 198007030926120 >198007030935060 198007031231000 >198007031236360 198007031313360 >198007031321000 198007031405120 >198007031410180 198007031438360 >198007031444360 198007031712300 >198007031717360 198007031819480 >198007031824540 198007031829300 >198007031834540 198007031944540 >198007031950000 198007032000480 >198007032006360 198007040146120 >198007040151540 198007040205360 >198007040211060 198007040615240 >198007040627240 198007041235300 >198007041241300 198007041727360 >198007041740300 198007041809360 >198007041823000 198007041834000 >198007041839300 198007041921000 >198007041946000 198007042129180 >198007042134480 198007050023300 >198007050030000 198007050048480 >198007050056360 198007050935180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-5-80-aa.422_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198006291911510 198006292141000 >198006292149070 198006292156050 >198006292240240 198006300226180 >198006300950540 198006301151300 >198006301157540 198006301935560 >198007010118210 198007010857570 >198007010905170 198007011544170 >198007011605570 198007012016570 >198007012202170 198007020306130 >198007020406530 198007020819330 >198007020907330 198007021012530 >198007021240490 198007030143490 >198007030345290 198007030906290 >198007030940290 198007040105490 >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_89-167/860.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:19 2021