u571af.m77t: MGD77T data file for Geophysical data from field activity 71005 (U-5-71-AF) in Continental Margin Liberia from 10/30/1971 to 11/20/1971

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Frequently anticipated questions:

What does this data set describe?

Title:
u571af.m77t: MGD77T data file for Geophysical data from field activity 71005 (U-5-71-AF) in Continental Margin Liberia from 10/30/1971 to 11/20/1971
Abstract:
Single-beam bathymetry, gravity, and magnetic data along with transit satellite navigation data was collected as part of field activity 71005 (U-5-71-AF) in Continental Margin Liberia from 10/30/1971 to 11/20/1971, http://walrus.wr.usgs.gov/infobank/u/u571af/html/u-5-71-af.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/u/u571af/html/u-5-71-af.bath.html http://walrus.wr.usgs.gov/infobank/u/u571af/html/u-5-71-af.grav.html http://walrus.wr.usgs.gov/infobank/u/u571af/html/u-5-71-af.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, u571af.m77t: MGD77T data file for Geophysical data from field activity 71005 (U-5-71-AF) in Continental Margin Liberia from 10/30/1971 to 11/20/1971: 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: -12.22040
    East_Bounding_Coordinate: -7.29000
    North_Bounding_Coordinate: 6.79120
    South_Bounding_Coordinate: 3.19460
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 30-Oct-1971
    Ending_Date: 20-Nov-1971
    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: Continental Margin Liberia
      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?
    u571af.m77t
    MGD77T single-beam bathymetry data file for U571AF (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:19711030
    Maximum:19711120
    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:3.19468
    Maximum:6.79105
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-12.2204
    Maximum:-7.29
    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:0.03
    Maximum:6.0
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:23
    Maximum:4510.0
    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:28985.8
    Maximum:33769.7
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-1292
    Maximum:3235.6
    Units:gammas
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:977929.2
    Maximum:978212.4
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-61.5
    Maximum:60.1
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-239.1
    Maximum:0
    Units:milligals
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, magnetic and navigation data for U.S. Geological Survey bathymetry survey U571AF in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation 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?
    John Schlee (Chief Scientist, USGS Woods Hole)
  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: 15-Dec-1995 (process 1 of 7)
    Navigation Data >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U571AF.N]U571AF.050; >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/u/u571af/grav/u-5-71-af.160_050 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/07/86 BARB DUA0:[DATA.U571AF]U571AF.160 >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U571AF.N]U571AF.050; >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 u-5-71-af.220_050 > >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/u/u571af/mag/u-5-71-af.200_050 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >03/10/86 CAROLYN DRS$DATA:[U571AF.M]U571AF.200; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >was U571AF.220 on 71BKUP > >03/22/85 CAROLYN USR$DISK:[DRS.DATA.U5.M]U571AF.220; >USR$DISK:[DRS.REFMT]REFORMAT.EXE;3 > >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U571AF.N]U571AF.050; >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/u/u571af/bath/u-5-71-af.325_050 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >03/07/86 BECKIE DUA0:[DATA.U571AF]U571AF.325; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >02/11/86 KAYE DUA0:[DATA.U571AF.N]U571AF.050; >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 (u-5-71-af.050 [SINS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197110300055000 197110310500000 >197110310510180 197110310510180 >197110310520420 197110310520420 >197110310531060 197110310531060 >197110310541300 197110310541300 >197110310550000 197111011111360 >197111011120000 197111011120000 >197111011130240 197111012025000 >197111012030420 197111021130000 >197111021910000 197111041445000 >197111041451240 197111060745000 >197111060750360 197111060750360 >197111060800000 197111071400000 >197111072345000 197111090750000 >197111120121120 197111120121120 >197111120130000 197111121335000 >197111121340420 197111121340420 >197111121351000 197111121351000 >197111121401240 197111121401240 >197111121411420 197111121411420 >197111121420000 197111121420000 >197111121430180 197111121430180 >197111121440360 197111121440360 >197111121450540 197111121450540 >197111121500000 197111121515000 >197111121521480 197111121521480 >197111121530000 197111130945000 >197111130950240 197111130950240 >197111131000420 197111131110420 >197111131121000 197111131121000 >197111131131180 197111131131180 >197111131141360 197111131141360 >197111131151540 197111131151540 >197111131200120 197111132101180 >197111132111420 197111151150420 >197111151201000 197111151201000 >197111151210000 197111152201540 >197111152210060 197111162200060 >197111181515000 197111191431420 >197111191805000 197111200600000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (u-5-71-af.160_050) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197110300305000 197110310150000 >197110310200000 197110310310000 >197110310350000 197110310455000 >197110310555000 197110310905000 >197110310945000 197110311035000 >197110311055000 197110311210000 >197110311225000 197110311635000 >197110311645000 197110311820000 >197110311830000 197110312000000 >197110312015000 197110312255000 >197110312315000 197111010215000 >197111010225000 197111010320000 >197111010330000 197111010555000 >197111010605000 197111010935000 >197111010945000 197111011010000 >197111011030000 197111011110000 >197111011135000 197111011255000 >197111011325000 197111012025000 >197111012035000 197111012315000 >197111012325000 197111012340000 >197111012350000 197111020205000 >197111020215000 197111020315000 >197111020325000 197111021130000 >197111021925000 197111030715000 >197111030725000 197111031955000 >197111032005000 197111041445000 >197111041505000 197111052115000 >197111052140000 197111052355000 >197111060005000 197111060745000 >197111060805000 197111060900000 >197111060910000 197111062355000 >197111070005000 197111071400000 >197111080005000 197111090250000 >197111090300000 197111090450000 >197111090505000 197111090745000 >197111120130000 197111120515000 >197111120525000 197111120825000 >197111120835000 197111121335000 >197111121500000 197111121515000 >197111121530000 197111122100000 >197111122115000 197111122210000 >197111122220000 197111122235000 >197111122245000 197111130125000 >197111130140000 197111130840000 >197111130850000 197111130945000 >197111131005000 197111131105000 >197111131210000 197111132010000 >197111132020000 197111132100000 >197111132115000 197111141200000 >197111141210000 197111151145000 >197111151215000 197111152200000 >197111152215000 197111160535000 >197111160545000 197111160645000 >197111160655000 197111161435000 >197111161445000 197111161745000 >197111161755000 197111162155000 >197111181515000 197111182205000 >197111182215000 197111190320000 >197111190330000 197111191425000 >197111191805000 197111200020000 >197111200035000 197111200420000 >197111200430000 197111200600000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (u-5-71-af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athymetry Data (u-5-71-af.325_050) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197110300055000 197110301520000 >197110301530000 197110310500000 >197110310550000 197110311020000 >197110311040000 197110311050000 >197110311140000 197110311745000 >197110311805000 197110312140000 >197110312150000 197110312205000 >197110312215000 197111011110000 >197111011135000 197111012025000 >197111012045000 197111012220000 >197111012230000 197111021040000 >197111021910000 197111022300000 >197111022315000 197111022330000 >197111022340000 197111031320000 >197111031330000 197111032240000 >197111032255000 197111032315000 >197111032325000 197111032340000 >197111032355000 197111041145000 >197111041255000 197111041445000 >197111041455000 197111041950000 >197111042020000 197111050245000 >197111050450000 197111051000000 >197111051010000 197111051210000 >197111051220000 197111052325000 >197111052335000 197111060745000 >197111060800000 197111061040000 >197111061100000 197111061220000 >197111061235000 197111061600000 >197111061610000 197111070010000 >197111070025000 197111070205000 >197111070215000 197111070320000 >197111070330000 197111070445000 >197111070455000 197111071220000 >197111072345000 197111080645000 >197111080700000 197111080710000 >197111080730000 197111080805000 >197111080815000 197111080835000 >197111080910000 197111081050000 >197111081100000 197111081120000 >197111081730000 197111081950000 >197111082005000 197111082010000 >197111082020000 197111090625000 >197111090635000 197111090750000 >197111120535000 197111121335000 >197111121555000 197111122030000 >197111122040000 197111130115000 >197111130130000 197111130655000 >197111130705000 197111130710000 >197111130720000 197111130720000 >197111130740000 197111130740000 >197111130835000 197111130945000 >197111131005000 197111131110000 >197111131205000 197111132100000 >197111132120000 197111141120000 >197111141130000 197111141425000 >197111141435000 197111142300000 >197111142315000 197111142315000 >197111142330000 197111150625000 >197111150635000 197111150725000 >197111150735000 197111151150000 >197111151210000 197111151700000 >197111151710000 197111152030000 >197111152230000 197111160205000 >197111160220000 197111160255000 >197111160325000 197111160325000 >197111160335000 197111160640000 >197111160650000 197111160940000 >197111160950000 197111161950000 >197111162000000 197111162055000 >197111162105000 197111162110000 >197111162120000 197111162200000 >197111181530000 197111181530000 >197111181730000 197111190600000 >197111190610000 197111190915000 >197111190925000 197111191430000 >197111191805000 197111191835000 >197111191845000 197111191940000 >197111191950000 197111192320000 >197111192330000 197111200600000 >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_89-167/796.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:53 2021