l1380np.m77t - MGD77 data file for Geophysical data from field activity L-13-80-NP in Northern Pacific from 11/18/1980 to 12/11/1980

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Frequently anticipated questions:

What does this data set describe?

Title:
l1380np.m77t - MGD77 data file for Geophysical data from field activity L-13-80-NP in Northern Pacific from 11/18/1980 to 12/11/1980
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with DGPS navigation data was collected as part of field activity L-13-80-NP in Northern Pacific from 11/18/1980 to 12/11/1980, http://walrus.wr.usgs.gov/infobank/l/l1380np/html/l-13-80-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/l1380np/html/l-13-80-np.bath.html, http://walrus.wr.usgs.gov/infobank/l/l1380np/html/l-13-80-np.grav.html, and http://walrus.wr.usgs.gov/infobank/l/l1380np/html/l-13-80-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, l1380np.m77t - MGD77 data file for Geophysical data from field activity L-13-80-NP in Northern Pacific from 11/18/1980 to 12/11/1980: 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: -144.29501
    East_Bounding_Coordinate: -122.39103
    North_Bounding_Coordinate: 37.81569
    South_Bounding_Coordinate: 33.57783
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 18-Nov-1980
    Ending_Date: 11-Dec-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: Northern 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?
    l1380np.m77t
    MGD77T single-beam bathymetry data file for L1380NP (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:19801118
    Maximum:19801211
    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:33.57783
    Maximum:37.81569
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-144.29501
    Maximum:-122.39189
    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:1.798
    Maximum:7.715
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:1337.4
    Maximum:5824.3
    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:43399.3
    Maximum:46078.3
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-194.5
    Maximum:217.3
    Units:gammas
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:978749
    Maximum:979999.9
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-45
    Maximum:94.8
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-710.5
    Maximum:159.9
    Units:milligals
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic, and navigation data for U.S. Geological Survey bathymetry survey L1380NP 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?
    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 7)
    Navigation Data >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.LD80NP]LD80NP.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/l1380np/grav/l-13-80-np.161_052 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >11/13/85 BARB DRS$DATA:[LD80NP.G]LD80NP.161; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >Input was... >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.LD80NP]LD80NP.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-13-80-np.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/l1380np/mag/l-13-80-np.200_052 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >11/18/85 CAROLYN DRS$DATA:[LD80NP.M]LD80NP.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was LC80NP._.MAGSA1 on TAM153 >was LC80NP200.DAT on MAM153 > >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.LD80NP]LD80NP.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/l1380np/bath/l-13-80-np.335_052 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >09/11/85 BECKIE DUA0:[DATA.LD80NP.B]LD80NP.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). > >Input was... >Converted to time format with year at start. > >11/26/85 EDM DUA0:[DATA.DRSDATA.NAVL.LD80NP]LD80NP.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-13-80-np.052 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198011180334000 198011281550000 >198011281644000 198011281833000 >198011281934000 198011281934000 >198011282032000 198011282032000 >198011282126000 198011290058000 >198011290140000 198011290158000 >198011290304000 198012112325400 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-13-80-np.161_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198011300638300 198012040019180 >198012040026180 198012071552420 >198012071559180 198012111621180 >198012111630000 198012112324420 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-13-80-np.220_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198011210338390 198011230010420 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-13-80-np.335_052) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198011221120000 198011221736000 >198011221757000 198011230115000 >198011230232000 198011230302000 >198011230328000 198011230331000 >198011230409000 198011230426000 >198011230515000 198011230515000 >198011230545000 198011230553000 >198011230619000 198011230636000 >198011230705000 198011230842000 >198011230922000 198011231130000 >198011231206000 198011231218000 >198011231240000 198011231313000 >198011231344000 198011231344000 >198011231441000 198011231441000 >198011231539000 198011231703000 >198011231725000 198011231731000 >198011231802000 198011231817000 >198011231847000 198011231916000 >198011231954000 198011232014000 >198011232036000 198011232047000 >198011232121000 198011240030000 >198011240140000 198011240253000 >198011240314000 198011240317000 >198011240355000 198011240410000 >198011240445000 198011242235000 >198011242301000 198011242301000 >198011242346000 198011250032000 >198011250119000 198011250533000 >198011250554000 198011250744000 >198011250810000 198011251821000 >198011251844000 198011261156000 >198011261227000 198011270052000 >198011270118000 198011270205000 >198011270236000 198011270301000 >198011270324000 198011270350000 >198011270424000 198011270515000 >198011270543000 198011270646000 >198011270718000 198011270718000 >198011270740000 198011270800000 >198011270827000 198011270827000 >198011270855000 198011270900000 >198011270938000 198011271001000 >198011271033000 198011271045000 >198011271108000 198011271946000 >198011272015000 198011282230000 >198011282331000 198011282355000 >198011290030000 198011290623000 >198011290720000 198011290730000 >198011290800000 198011290800000 >198011290830000 198011291320000 >198011291345000 198011291345000 >198011291435000 198011291435000 >198011291520000 198011300547000 >198011300630000 198011300630000 >198011300708000 198011300708000 >198011300743000 198011300835000 >198011300955000 198011301006000 >198011301035000 198011301124000 >198011301225000 198011301225000 >198011301252000 198011301252000 >198011301335000 198011302252000 >198011302314000 198011302332000 >198011302357000 198011302357000 >198012010029000 198012010047000 >198012010144000 198012010144000 >198012010220000 198012010220000 >198012010247000 198012010247000 >198012010310000 198012010310000 >198012010347000 198012010347000 >198012010412000 198012010412000 >198012010445000 198012010458000 >198012010523000 198012010523000 >198012010600000 198012010600000 >198012010632000 198012010632000 >198012010702000 198012010718000 >198012010742000 198012010949000 >198012011014000 198012020053000 >198012020123000 198012020123000 >198012020149000 198012020149000 >198012020221000 198012020255000 >198012020339000 198012020339000 >198012020410000 198012020432000 >198012020457000 198012020457000 >198012020526000 198012022124000 >198012022150000 198012022150000 >198012022222000 198012022342000 >198012030010000 198012030127000 >198012030148000 198012030339000 >198012030403000 198012030403000 >198012030425000 198012030425000 >198012030453000 198012030611000 >198012030639000 198012031022000 >198012031045000 198012031426000 >198012031457000 198012032341000 >198012040015000 198012040015000 >198012040042000 198012040156000 >198012040226000 198012040226000 >198012040259000 198012040352000 >198012040420000 198012040435000 >198012040525000 198012040525000 >198012040615000 198012040634000 >198012040701000 198012040746000 >198012040820000 198012040820000 >198012040843000 198012040855000 >198012040919000 198012040958000 >198012041033000 198012041033000 >198012041055000 198012041055000 >198012041125000 198012041125000 >198012041155000 198012041155000 >198012041221000 198012041221000 >198012041245000 198012041245000 >198012041320000 198012041320000 >198012041347000 198012041410000 >198012041520000 198012041520000 >198012041542000 198012041542000 >198012041607000 198012041607000 >198012041630000 198012041630000 >198012041715000 198012041720000 >198012041747000 198012041747000 >198012041811000 198012041811000 >198012041832000 198012050410000 >198012050435000 198012050440000 >198012050518000 198012050518000 >198012050620000 198012050620000 >198012050705000 198012050705000 >198012050730000 198012050730000 >198012050828000 198012050828000 >198012050900000 198012050952000 >198012051020000 198012051020000 >198012051051000 198012051051000 >198012051132000 198012051150000 >198012051215000 198012051215000 >198012051240000 198012051240000 >198012051315000 198012051315000 >198012051350000 198012051350000 >198012051430000 198012051430000 >198012051500000 198012051510000 >198012051535000 198012051535000 >198012051630000 198012051630000 >198012051710000 198012051929000 >198012051951000 198012051951000 >198012052020000 198012052020000 >198012052050000 198012052050000 >198012052123000 198012052123000 >198012052155000 198012052155000 >198012052229000 198012052229000 >198012052250000 198012052250000 >198012052315000 198012052315000 >198012060000000 198012060000000 >198012060032000 198012060032000 >198012060105000 198012060140000 >198012060214000 198012060251000 >198012060318000 198012060318000 >198012060340000 198012060447000 >198012060520000 198012060555000 >198012060624000 198012060741000 >198012060803000 198012060817000 >198012060845000 198012060915000 >198012060940000 198012061159000 >198012061220000 198012061250000 >198012061327000 198012061327000 >198012061353000 198012061353000 >198012061415000 198012061959000 >198012062023000 198012062324000 >198012070015000 198012070122000 >198012070143000 198012070252000 >198012070314000 198012070358000 >198012070433000 198012070514000 >198012070543000 198012070726000 >198012070807000 198012070807000 >198012070833000 198012071048000 >198012071110000 198012071145000 >198012071215000 198012071215000 >198012071246000 198012071246000 >198012071310000 198012071554000 >198012071617000 198012071647000 >198012071710000 198012071920000 >198012071945000 198012072020000 >198012072101000 198012072101000 >198012072125000 198012080100000 >198012080128000 198012080215000 >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_89-167/831.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:55 2021