g175eg.m77t - MGD77 data file for Geophysical data from field activity G-1-75-EG in Eastern Gulf of Alaska, Continental Shelf from 06/22/1975 to 08/27/1975

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Frequently anticipated questions:

What does this data set describe?

Title:
g175eg.m77t - MGD77 data file for Geophysical data from field activity G-1-75-EG in Eastern Gulf of Alaska, Continental Shelf from 06/22/1975 to 08/27/1975
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity G-1-75-EG in Eastern Gulf of Alaska, Continental Shelf from 06/22/1975 to 08/27/1975, http://walrus.wr.usgs.gov/infobank/g/g175eg/html/g-1-75-eg.meta.html The geophysical source was a Knudsen 12 kHz 320B/R echosounder. 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/g/g175eg/html/g-1-75-eg.bath.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, g175eg.m77t - MGD77 data file for Geophysical data from field activity G-1-75-EG in Eastern Gulf of Alaska, Continental Shelf from 06/22/1975 to 08/27/1975: 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: -162.72705
    East_Bounding_Coordinate: -137.06030
    North_Bounding_Coordinate: 60.18927
    South_Bounding_Coordinate: 54.03096
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 22-Jun-1975
    Ending_Date: 27-Aug-1975
    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: Eastern Gulf of Alaska, Continental Shelf
      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?
    g175eg.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for G175EG (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:19750626
    Maximum:19750827
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.966
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:54.03103
    Maximum:60.18864
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-162.65726
    Maximum:-137.1406
    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
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:16
    Maximum:2763.3
    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:59
    Maximum:59
    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:50719.9
    Maximum:57379.4
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:50982
    Maximum:56864
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-471.2
    Maximum:1201.2
    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:981354.6
    Maximum:981989.4
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-42.3
    Maximum:39.7
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:--83.7
    Maximum:148.4
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:533
    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:8283
    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 G175EG 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?
    Terry Bruns (Chief Scientist, USGS Western Region); Ken Bayer (Chief Scientist, USGS Western Region); Gary Winkler (Chief Scientist, USGS Western Region)
  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: 06-Dec-1995 (process 1 of 7)
    Navigation Data >Converted to time format with year at start. > >02/07/86 KAYE DUA0:[DATA.G175EG.N]G175EG.051; >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/g/g175eg/grav/g-1-75-eg.162_051 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >01/17/86 BARB DUA0:[DATA.G175EG.G]G175EG.162; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >02/07/86 KAYE DUA0:[DATA.G175EG.N]G175EG.051; >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 g-1-75-eg.260_051 > >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/g/g175eg/mag/g-1-75-eg.240_051 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/10/86 CAROLYN DRS$DATA:[G175EG.M]G175EG.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >177/0710-177/1248 was G175EG.240 from 75BKUP >177/1250-239/1811 was G175EG.202 from Barb >profile of slave values look like regional instead > >Converted to time format with year at start. > >02/07/86 KAYE DUA0:[DATA.G175EG.N]G175EG.051; >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/g/g175eg/bath/g-1-75-eg.305_051 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/15/86 CLINT DISK$USERDISK:[CLINT.GREEN]G175EG.300; >DRB0:[CLINT.GREEN]TEMP.EXE; > >Input was... >Converted to time format with year at start. > >02/07/86 KAYE DUA0:[DATA.G175EG.N]G175EG.051; >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 (g-1-75-eg.051 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197506260701070 197508210957070 >197508211538350 197508211854000 >197508212109170 197508212250000 >197508220205000 197508220405000 >197508220711000 197508221111000 >197508221213080 197508221522550 >197508221826490 197508222127000 >197508230340580 197508231214360 >197508232336330 197508240732000 >197508241352420 197508241543000 >197508242047060 197508250103000 >197508250317320 197508250557200 >197508250800170 197508251200390 >197508251611560 197508252307000 >197508260351230 197508260512000 >197508260746590 197508261340340 >197508261929120 197508262045000 >197508270657380 197508270958260 >197508271614260 197508272001550 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (g-1-75-eg.162_051) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197506260707000 197506261248000 >197506261258000 197506261523000 >197506261612000 197506262155000 >197506262220000 197506270054000 >197506270358000 197506270857000 >197506271145000 197506272153000 >197506272328000 197506280333000 >197506300658000 197506301108000 >197506301653000 197507010141000 >197507010210000 197507010833000 >197507010942000 197507011715000 >197507011851000 197507020422000 >197507020923000 197507021646000 >197507021902000 197507022150000 >197507030137000 197507030532000 >197507042328000 197507050433000 >197507050615000 197507050904000 >197507052027000 197507060305000 >197507060539000 197507061613000 >197507062044000 197507062113000 >197507062229000 197507070459000 >197507070846000 197507071325000 >197507071609000 197507072214000 >197507080147000 197507080942000 >197507081540000 197507082115000 >197507090205000 197507090929000 >197507100008000 197507100420000 >197507100659000 197507101315000 >197507101609000 197507102122000 >197507110212000 197507110245000 >197507110716000 197507110933000 >197507111059000 197507111546000 >197507111602000 197507112246000 >197507112314000 197507112326000 >197507120651000 197507121440000 >197507121504000 197507121926000 >197507122201000 197507130133000 >197507131416000 197507131636000 >197507131904000 197507140607000 >197507150824000 197507151700000 >197507181219000 197507181349000 >197507181635000 197507182142000 >197507182322000 197507182356000 >197507190234000 197507190944000 >197507191146000 197507191939000 >197507192216000 197507200441000 >197507200607000 197507201216000 >197507201315000 197507201343000 >197507201902000 197507202232000 >197507210200000 197507210621000 >197507210735000 197507211235000 >197507211354000 197507212240000 >197507222357000 197507230101000 >197507230756000 197507230952000 >197507231536000 197507231629000 >197507231755000 197507232102000 >197507261557000 197507262017000 >197507262133000 197507262336000 >197507270141000 197507270621000 >197507270757000 197507271047000 >197507272147000 197507280905000 >197507281143000 197507281759000 >197507281915000 197507290125000 >197507290249000 197507291227000 >197507291731000 197507292309000 >197507300423000 197507300519000 >197507310143000 197507310807000 >197508010455000 197508010940000 >197508011115000 197508011350000 >197508011540000 197508011847000 >197508011949000 197508012001000 >197508020856000 197508021000000 >197508021441000 197508030132000 >197508030436000 197508030838000 >197508031043000 197508031251000 >197508031413000 197508031445000 >197508031515000 197508031710000 >197508032222000 197508040716000 >197508040808000 197508040930000 >197508041034000 197508041111000 >197508041527000 197508041840000 >197508050127000 197508050325000 >197508050540000 197508050748000 >197508051857000 197508052310000 >197508060314000 197508060454000 >197508061700000 197508062153000 >197508062311000 197508070025000 >197508070226000 197508070356000 >197508072037000 197508072324000 >197508080125000 197508080519000 >197508081934000 197508090059000 >197508090651000 197508090932000 >197508091716000 197508092003000 >197508092135000 197508100452000 >197508100608000 197508100937000 >197508101226000 197508101400000 >197508101623000 197508102049000 >197508110742000 197508111414000 >197508142211000 197508150412000 >197508150629000 197508151218000 >197508162151000 197508162321000 >197508170215000 197508171131000 >197508171743000 197508180457000 >197508210000000 197508210510000 >197508210614000 197508211001000 >197508211539000 197508211855000 >197508212110000 197508212251000 >197508220205000 197508220407000 >197508220711000 197508221112000 >197508221214000 197508221526000 >197508221827000 197508222131000 >197508230341000 197508231218000 >197508232337000 197508240734000 >197508241353000 197508241544000 >197508242048000 197508250105000 >197508250318000 197508250601000 >197508250801000 197508251201000 >197508251612000 197508252310000 >197508260352000 197508260515000 >197508260747000 197508261342000 >197508261930000 197508262045000 >197508271658000 197508271808000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (g-1-75-eg.260_051) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197506260710000 197506261248000 >197506261258000 197506261527000 >197506261609000 197506262157000 >197506262217000 197506270056000 >197506270355000 197506270639000 >197506270709000 197506270900000 >197506271142000 197506272155000 >197506272344000 197506280318000 >197506301650000 197506302357000 >197507010005000 197507010143000 >197507010207000 197507010835000 >197507010939000 197507011321000 >197507011417000 197507011503000 >197507011522000 197507011717000 >197507011848000 197507020424000 >197507020826000 197507021649000 >197507021859000 197507022152000 >197507030133000 197507030551000 >197507042325000 197507050436000 >197507050612000 197507050906000 >197507052024000 197507060305000 >197507060536000 197507061616000 >197507062041000 197507062116000 >197507062226000 197507070501000 >197507070843000 197507071327000 >197507071606000 197507072217000 >197507080144000 197507080945000 >197507081537000 197507082117000 >197507090139000 197507090933000 >197507100005000 197507100423000 >197507100657000 197507101052000 >197507101114000 197507101317000 >197507101559000 197507102317000 >197507110209000 197507110359000 >197507110713000 197507110936000 >197507111056000 197507111548000 >197507111559000 197507112248000 >197507112311000 197507120209000 >197507120648000 197507120759000 >197507120820000 197507121443000 >197507121502000 197507121928000 >197507122157000 197507130135000 >197507130252000 197507130534000 >197507131210000 197507131702000 >197507131901000 197507140609000 >197507141044000 197507141703000 >197507141936000 197507142139000 >197507150242000 197507150317000 >197507181215000 197507181429000 >197507181632000 197507182144000 >197507182319000 197507190037000 >197507190231000 197507190946000 >197507191143000 197507191941000 >197507192214000 197507200443000 >197507200605000 197507201218000 >197507201312000 197507201343000 >197507201905000 197507202234000 >197507210157000 197507210623000 >197507210732000 197507211237000 >197507211351000 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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_89-167/807.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:54 2021