l781wg.m77t - MGD77 data file for Geophysical data from field activity L-7-81-WG in Western Gulf of Alaska from 06/11/1981 to 06/30/1981

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

Frequently anticipated questions:

What does this data set describe?

Title:
l781wg.m77t - MGD77 data file for Geophysical data from field activity L-7-81-WG in Western Gulf of Alaska from 06/11/1981 to 06/30/1981
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with transit satellite navigation data was collected as part of field activity L-7-81-WG in Western Gulf of Alaska from 06/11/1981 to 06/30/1981,http://walrus.wr.usgs.gov/infobank/l/l781wg/html/l-7-81-wg.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/l781wg/html/l-7-81-wg.bath.html http://walrus.wr.usgs.gov/infobank/l/l781wg/html/l-7-81-wg.grav.html and http://walrus.wr.usgs.gov/infobank/l/l781wg/html/l-7-81-wg.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, l781wg.m77t - MGD77 data file for Geophysical data from field activity L-7-81-WG in Western Gulf of Alaska from 06/11/1981 to 06/30/1981: 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: -155.55890
    East_Bounding_Coordinate: -146.07220
    North_Bounding_Coordinate: 59.95458
    South_Bounding_Coordinate: 55.79541
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 11-Jun-1981
    Ending_Date: 30-Jun-1981
    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: Western Gulf of 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?
    l781wg.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for U171GM (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:19810611
    Maximum:19810630
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.993
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:55.79541
    Maximum:59.95458
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-155.55889
    Maximum:-146.07226
    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:0.017
    Maximum:7.217
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:12.8
    Maximum:5423.7
    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:53032
    Maximum:56947.3
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-1165.2
    Maximum:2201.1
    Units:gammas
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:981469.7
    Maximum:981941.9
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-46.1
    Maximum:43.2
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-116.9
    Maximum:131.2
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:11
    Maximum:122
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:41
    Maximum:5070
    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 survey l781wg 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?
    Roland Von Huene (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. > >07/23/85 KAYE DRS$DATA:[L781WG.N]L781WG.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l781wg.sinsd1._. > Person who carried out this activity:
    U.S. Geological Survey (USGS) http://www.usgs.gov, Coastal and Marine Geology (CMG) http://walrus.wr.usgs.gov
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 2 of 7)
    Gravity Data >10/31/1998 /tiger/l/l781wg/grav/l-7-81-wg.162_053 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >04/25/88 BECKIE DUA0:[DATA.L476WG]L781WG.162; >DUA0:[DRS.GRV]GRAVRED.EXE;4 >Free Air Anomaly data > >*10/15/85 BARB USR$DISK:[DRS.DATA.L781WG.G]L781WG.140; >USR$DISK:[DRS.REFMT}REFORMAT.EXE; > >*10/11/85 BARB DRS$DATA:[L781WG.G]L781WG.111; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 > >*04/18/88 BECKIE DUA0:[DATA.L476WG]L781WG.070; >DUA0:[DRS.NAV]EOTCSSP.EXE;1 >Eotvos/course/speed/distance data > >07/23/85 KAYE DRS$DATA:[L781WG.N]L781WG.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l781wg.sinsd1._. > >Input was... >Converted to time format with year at start. > >07/23/85 KAYE DRS$DATA:[L781WG.N]L781WG.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l781wg.sinsd1._. > >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: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 20-Jun-2012 (process 3 of 7)
    Magnetics Data >06/20/2012 carolyn l-7-81-wg.220_053 > >Reprocessed using subroutines from Susan Macmillan's >IGRF SYNTHESIS PROGRAM >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/l781wg/mag/l-7-81-wg.200_053 >/bear/programs/edit/automerge/automerge > >01/21/97 clint l-7-81-wg.200 >/bear/programs/refmt/vms2unix/vms2unix >Raw magnetics data > >11/19/85 CAROLYN DRS$DATA:[L781WG.M]L781WG.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >was L781WG._.MAGSB1 on TAM287 >was L781WG221.DAT on VAM287 > >Converted to time format with year at start. > >07/23/85 KAYE DRS$DATA:[L781WG.N]L781WG.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l781wg.sinsd1._. > >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: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 31-Oct-1998 (process 4 of 7)
    Bathymetry Data >10/31/1998 /tiger/l/l781wg/bath/l-7-81-wg.336_053 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >01/13/86 BECKIE DISK$USERDISK:[BECKIE.BAT360]L781WG.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hadn-digetized in 2-way traveltime(secs). >It was reduced using no Matthews correction and vel- >ocity of sound assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >07/23/85 KAYE DRS$DATA:[L781WG.N]L781WG.053; >DRB0:[DRS.REFMT]REFORMAT.EXE;4 >Original file name is l781wg.sinsd1._. > >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: Clint Steele
    InfoBank Group Leader
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (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-7-81-wg.053 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198106111308570 198106291228340 >198106291251500 198106301844000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-7-81-wg.162_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198106111311000 198106122017400 >198106122037200 198106130309400 >198106130315200 198106131402000 >198106131421400 198106141229300 >198106141245060 198106152314360 >198106152320280 198106170053240 >198106170102440 198106171251200 >198106171257520 198106172123320 >198106172132040 198106181429000 >198106181658080 198106190953360 >198106191002080 198106201139320 >198106201145320 198106210430360 >198106210437560 198106211305120 >198106211311040 198106212136200 >198106212143240 198106221526480 >198106221537330 198106241218520 >198106241905520 198106250331560 >198106250338560 198106261547040 >198106261552560 198106270020560 >198106270027120 198106280404360 >198106280410000 198106282058400 >198106282103480 198106291554280 >198106291601000 198106300049400 >198106300057360 198106301844000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-7-81-wg.220_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198106111617200 198106112250430 >198106121001200 198106121356280 >198106121606000 198106121808120 >198106131911000 198106141232300 >198106141248060 198106152317520 >198106152323280 198106170056360 >198106170105440 198106171254280 >198106171300520 198106172126440 >198106172135040 198106181432000 >198106181701080 198106190956520 >198106191005080 198106201143240 >198106201148320 198106210434280 >198106210440560 198106211308280 >198106211314040 198106212139400 >198106212146240 198106221530400 >198106221540330 198106241222080 >198106241908520 198106250335160 >198106250341560 198106260402080 >198106260607400 198106261550400 >198106261555560 198106270024080 >198106270030120 198106270227160 >198106270636000 198106280407560 >198106280413000 198106290320520 >198106290507400 198106291558240 >198106291604000 198106300053240 >198106300100360 198106301103100 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-7-81-wg.336_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198106111455000 198106112003360 >198106112015540 198106122358120 >198106130130000 198106132313120 >198106132324120 198106150618000 >198106150730000 198106151247360 >198106151300000 198106160049300 >198106160100000 198106200349540 >198106200402180 198106200430000 >198106200448120 198106201218480 >198106201237420 198106201332240 >198106201351120 198106210430480 >198106210445180 198106210719180 >198106210731120 198106210731120 >198106210742480 198106210746480 >198106210803540 198106210818000 >198106210832360 198106211630000 >198106211643480 198106221457540 >198106221508360 198106221702060 >198106221714360 198106221744000 >198106221758120 198106230205540 >198106230216480 198106230233180 >198106230245360 198106230351120 >198106230411540 198106230641360 >198106230710060 198106232306480 >198106232326180 198106240518360 >198106240530060 198106240705480 >198106240716360 198106241444480 >198106241520000 198106241700000 >198106241715000 198106241829120 >198106241901000 198106242033240 >198106242057180 198106242059180 >198106242120240 198106250440120 >198106250452060 198106252152360 >198106252222420 198106252315360 >198106260002540 198106260002540 >198106260053540 198106260147180 >198106260200000 198106261726000 >198106261736540 198106262147240 >198106262202360 198106270241300 >198106270301060 198106270412360 >198106270429540 198106271433000 >198106271447300 198106272139300 >198106272153060 198106272209240 >198106272224120 198106280018420 >198106280029120 198106280300000 >198106280310240 198106280625540 >198106280637360 198106280958120 >198106281014480 198106281226120 >198106281238000 198106281609480 >198106281637060 198106281909000 >198106281935480 198106282301240 >198106282315240 198106290133420 >198106290205240 198106290751480 >198106290821120 198106290900000 >198106290912120 198106292313360 >198106292323420 198106301241540 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-7-81-wg.421_053) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >198106132000200 198106140244480 >198106141057160 198106141442560 >198106141950350 198106142333010 >198106150044280 198106150211340 >198106150311160 198106150748290 >198106151003220 198106151611160 >198106151616380 198106151616380 >198106151621420 198106151851070 >198106151933280 198106152037230 >198106152042300 198106162132160 >198106162359530 198106170608090 >198106170818100 198106171100160 >198106171141350 198106180714110 >198106180824270 198106181404200 >198106190321160 198106191645000 >198106191752560 198106191902560 >198106192045550 198106201824330 >198106202113580 198106211912270 >198106212012450 198106212233540 >198106212341320 198106222015130 >198106222117480 198106222340390 >198106230046460 198106231309000 >198106231326270 198106231915080 >198106232017040 198106240945060 >198106241223430 198106251048550 >198106251218200 198106260352510 >198106270920400 198106272057120 >198106272154210 198106272239430 >198106272323430 198106280432080 >198106280518560 198106280724460 >198106280858320 198106281600080 >198106281642010 198106281902360 >198106281937300 198106282205330 >198106282211250 198106282211250 >198106282216590 198106290320370 >198106290621540 198106291402500 >198106291505100 198106291706510 >198106291739090 198106292117270 >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_89-167/1307.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:53 2021