l482np.m77t - MGD77 data file for Geophysical data from field activity L-4-82-NP in Low-energy abyssal hill areas midway between San Franciso and Hawaii from 03/01/1982 to 03/15/1982

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Frequently anticipated questions:


What does this data set describe?

Title:
l482np.m77t - MGD77 data file for Geophysical data from field activity L-4-82-NP in Low-energy abyssal hill areas midway between San Franciso and Hawaii from 03/01/1982 to 03/15/1982
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-4-82-NP in Low-energy abyssal hill areas midway between San Franciso and Hawaii from 03/01/1982 to 03/15/1982, http://walrus.wr.usgs.gov/infobank/l/l482np/html/l-4-82-np.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/l482np/html/l-4-82-np.bath.html, http://walrus.wr.usgs.gov/infobank/l/l482np/html/l-4-82-np.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l482np/html/l-4-82-np.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, l482np.m77t - MGD77 data file for Geophysical data from field activity L-4-82-NP in Low-energy abyssal hill areas midway between San Franciso and Hawaii from 03/01/1982 to 03/15/1982: 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: -157.90100
    East_Bounding_Coordinate: -127.43979
    North_Bounding_Coordinate: 36.97763
    South_Bounding_Coordinate: 21.22169
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Mar-1982
    Ending_Date: 15-Mar-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:
      Low-energy abyssal hill areas midway between San Franciso and Hawaii
      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?
    l482np.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for L482NP (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:19820303
    Maximum:19820315
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:21.22169
    Maximum:36.96831
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-157.90100
    Maximum:-127.5064
    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:1.406
    Maximum:7.379
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:1046.5
    Maximum:5563.3
    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: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:43788
    Maximum:46451.8
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-243.6
    Maximum:246.9
    Units:gammas
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L482NP 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 Piper (Chief Scientist);Steve Eittreim (Chief Scientist)
  3. To whom should users address questions about the data?
    Gregory K. Miller
    U.S. Geological Survey
    Physical Scientist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3020 (voice)
    gmiller@usgs.gov

Why was the data set created?

These data and information are intended for science researchers,students, policy makers, and general public. These data are not to be used for navigation purposes. The data are reformatted into MGD77T standard format for inclusion into NOAA's NGDC geophysical database. From there the data will be made available to GeoMapApp ( http://www.geomapapp.org/ ) and Virtual Ocean ( http://www.virtualocean.org/ ) Earth-browsing software. Access to the data is also provided via the USGS Coastal and Marine Geoscience Data System ( http://cmgds.marine.usgs.gov/ ).

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 19-Jan-1996 (process 1 of 6)
    Navigation Data >Converted to time format with year at start. > >05/31/85 KAYE USR$DISK:[DRS.DATA.L482NP.N]L482NP.051; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l482np.sinsb1._, desampled to 2 minutes. > Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 2 of 6)
    Gravity Data >10/31/1998 /tiger/l/l482np/grav/l-4-82-np.110_051 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >10/02/85 BARB DRS$DATA:[L482NP.G]L482NP.110; >DRS$DATA:[L482NP.G]REFGRV.EXE; > >Input was... >Converted to time format with year at start. > >05/31/85 KAYE USR$DISK:[DRS.DATA.L482NP.N]L482NP.051; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l482np.sinsb1._, desampled to 2 minutes. > >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 6)
    Magnetics Data >06/20/2012 carolyn l-4-82-np.220_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/l/l482np/mag/l-4-82-np.200_051 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >11/22/85 CAROLYN DRS$DATA:[L482NP.M]L482NP220.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was L482NP._.MAGSB1 on TAM351 >was L482NP220.DAT on VAM351 > >Converted to time format with year at start. > >05/31/85 KAYE USR$DISK:[DRS.DATA.L482NP.N]L482NP.051; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l482np.sinsb1._, desampled to 2 minutes. > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 4 of 6)
    Bathymetry Data >10/31/1998 /tiger/l/l482np/bath/l-4-82-np.330_051 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >06/10/85 BECKIE USR$DISK:[DRS.DATA.L482NP.B]L482NP.330; >DRA1:[DRS.BAT]BATRED.EXE;1 >I believe this file to be hand-digetized bathy in >2-way travel time/secs. Calculated depths are based >upon an assummed travel time of 1500M/sec. R.Larsen. > >Input was... >Converted to time format with year at start. > >05/31/85 KAYE USR$DISK:[DRS.DATA.L482NP.N]L482NP.051; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l482np.sinsb1._, desampled to 2 minutes. > >time, lat, long, time(sec) to nearest nav fix, data values Person who carried out this activity:
    U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 20-Jun-2012 (process 5 of 6)
    MGD77 file creation - The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. Person who carried out this activity:
    U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 01-Feb-2017 (process 6 of 6)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
  3. What similar or related data should the user be aware of?
    Hittelman, Allen M., Groman, Robert C., Haworth, Richard T., Holcombe, Troy L., McHendrie, Graig, Smith, Stuart M., and Metzger, Dan R., 2010, The marine geophysical data exchange format - MGD77 / MGD77T: National Geophysical Data Center, National Oceanic and Atmospheric Administration, Boulder, CO.

    Online Links:

    Other_Citation_Details: 25 p.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The validity or accuracy of bathymetry and navigation data is highly qualitative and depends on equipment and operating condition variables. Data quality is unknown, MGD77T files were formatted from InfoBank files identified as best available version.
  2. How accurate are the geographic locations?
    Unspecified
  3. How accurate are the heights or depths?
    Unspecified
  4. Where are the gaps in the data? What is missing?
    Start and end date/times of data >Navigation Data (l-4-82-np.051 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203030030590 198203030030590 >198203030058000 198203151133000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-4-82-np.110_051) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203041735530 198203060518090 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-4-82-np.220_051) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203041735530 198203060517330 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-4-82-np.330_051) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198203060700000 198203060717000 >198203060730000 198203060730000 >198203060746000 198203060746000 >198203060808000 198203060808000 >198203060830000 198203060830000 >198203060842000 198203060842000 >198203060903000 198203060923000 >198203060937000 198203060937000 >198203060951000 198203060951000 >198203061003000 198203061003000 >198203061014000 198203061043000 >198203061100000 198203061133000 >198203061144000 198203061236000 >198203061256000 198203061256000 >198203061317000 198203061317000 >198203061335000 198203061335000 >198203061400000 198203061400000 >198203061415000 198203061415000 >198203061455000 198203061525000 >198203061536000 198203061536000 >198203061556000 198203061615000 >198203061630000 198203061655000 >198203061708000 198203061736000 >198203061750000 198203061813000 >198203061824000 198203061824000 >198203061836000 198203061836000 >198203061848000 198203061848000 >198203061859000 198203061859000 >198203061920000 198203061920000 >198203061932000 198203061932000 >198203061944000 198203061944000 >198203062052000 198203062115000 >198203062129000 198203062129000 >198203062140000 198203062140000 >198203062203000 198203062203000 >198203062221000 198203062245000 >198203062256000 198203062256000 >198203062312000 198203062337000 >198203062348000 198203070001000 >198203070015000 198203070021000 >198203070037000 198203070037000 >198203070052000 198203070052000 >198203070104000 198203070134000 >198203070147000 198203070227000 >198203070240000 198203070325000 >198203070338000 198203070338000 >198203070352000 198203070352000 >198203070408000 198203070413000 >198203070425000 198203070425000 >198203070436000 198203070436000 >198203070454000 198203070454000 >198203070506000 198203070540000 >198203070554000 198203070610000 >198203070623000 198203070623000 >198203070637000 198203070637000 >198203070652000 198203070652000 >198203070711000 198203070711000 >198203070724000 198203070724000 >198203070740000 198203070745000 >198203070756000 198203070811000 >198203070823000 198203070839000 >198203070854000 198203070901000 >198203070917000 198203070923000 >198203070936000 198203071017000 >198203071033000 198203071033000 >198203071054000 198203071103000 >198203071121000 198203071121000 >198203071132000 198203071142000 >198203071157000 198203071313000 >198203071326000 198203071326000 >198203071338000 198203071338000 >198203071350000 198203071350000 >198203071404000 198203071419000 >198203071433000 198203071433000 >198203071444000 198203071524000 >198203071541000 198203071558000 >198203071612000 198203071704000 >198203071718000 198203071736000 >198203071800000 198203071836000 >198203071847000 198203071904000 >198203071915000 198203071915000 >198203071926000 198203071926000 >198203071948000 198203072018000 >198203072032000 198203072042000 >198203072054000 198203072054000 >198203072105000 198203072105000 >198203072119000 198203072151000 >198203072203000 198203072203000 >198203072214000 198203072331000 >198203072346000 198203072346000 >198203080001000 198203080020000 >198203080031000 198203080031000 >198203080045000 198203080045000 >198203080100000 198203080100000 >198203080111000 198203080120000 >198203080138000 198203080138000 >198203080202000 198203080202000 >198203080229000 198203080229000 >198203080240000 198203080240000 >198203080256000 198203080256000 >198203080313000 198203080313000 >198203080326000 198203080332000 >198203080400000 198203080400000 >198203080417000 198203080417000 >198203080432000 198203080432000 >198203080501000 198203080501000 >198203080531000 198203080531000 >198203080557000 198203080557000 >198203080654000 198203080654000 >198203080707000 198203080707000 >198203080730000 198203080730000 >198203080809000 198203080809000 >198203080825000 198203080825000 >198203080850000 198203080850000 >198203080902000 198203080902000 >198203080919000 198203080919000 >198203080935000 198203080945000 >198203080958000 198203081043000 >198203081054000 198203081103000 >198203081124000 198203081232000 >198203081244000 198203081244000 >198203081256000 198203081334000 >198203081345000 198203081353000 >198203081410000 198203081410000 >198203081425000 198203081431000 >198203081457000 198203081457000 >198203081520000 198203081520000 >198203081538000 198203081538000 >198203081557000 198203081557000 >198203081615000 198203081615000 >198203081628000 198203081628000 >198203081644000 198203081653000 >198203081705000 198203081705000 >198203081719000 198203081738000 >198203081750000 198203081750000 >198203081804000 198203081804000 >198203081815000 198203081824000 >198203081835000 198203081915000 >198203081927000 198203081927000 >198203081940000 198203082031000 >198203082045000 198203082235000 >198203082247000 198203082325000 >198203082339000 198203082339000 >198203082350000 198203082350000 >198203090007000 198203090007000 >198203090030000 198203090030000 >198203090125000 198203090125000 >198203090243000 198203090243000 >198203090313000 198203090313000 >198203090349000 198203090349000 >198203090401000 198203090401000 >198203090423000 198203090423000 >198203090443000 198203090443000 >198203090454000 198203090502000 >198203090524000 198203090534000 >198203090547000 198203090547000 >198203090612000 198203090612000 >198203090624000 198203090632000 >198203090717000 198203090717000 >198203090734000 198203090742000 >198203090758000 198203090758000 >198203090815000 198203090815000 >198203090837000 198203090837000 >198203090920000 198203090920000 >198203091008000 198203091008000 >198203091025000 198203091025000 >198203091050000 198203091050000 >198203091101000 198203091101000 >198203091141000 198203091141000 >198203091200000 198203091200000 >198203091304000 198203091304000 >198203091345000 198203091345000 >198203091403000 198203091403000 >198203091418000 198203091458000 >198203091539000 198203091539000 >198203091606000 198203091606000 >198203091623000 198203091631000 >198203091644000 198203091644000 >198203091703000 198203091709000 >198203091725000 198203091812000 >198203091826000 198203091934000 >198203091947000 198203091955000 >198203092007000 198203092007000 >198203092028000 198203092028000 >198203092042000 198203092042000 >198203092055000 198203092055000 >198203092201000 198203092201000 >198203092224000 198203092224000 >198203092302000 198203092302000 >198203092325000 198203092325000 >198203092357000 198203092357000 >198203100017000 198203100017000 >198203100029000 198203100029000 >198203100047000 198203100056000 >198203100114000 198203100119000 >198203100130000 198203100154000 >198203100209000 198203100219000 >198203100236000 198203100236000 >198203100249000 198203100256000 >198203100311000 198203100311000 >198203100323000 198203100323000 >198203100334000 198203100334000 >198203100356000 198203100356000 >198203100409000 198203100409000 >198203100422000 198203100422000 >198203100436000 198203100436000 >198203100450000 198203100505000 >198203100517000 198203100533000 >198203100544000 198203100607000 >198203100630000 198203100636000 >198203100648000 198203100648000 >198203100706000 198203100706000 >198203100717000 198203100717000 >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: 01-Feb-2017
Metadata author:
Gregory K. Miller
U.S. Geological Survey
Physical Scientist
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3020 (voice)
gmiller@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/855.faq.html>
Generated by mp version 2.9.49 on Mon Sep 10 17:43:20 2018