l877bs.m77t - MGD77 data file for Geophysical data from field activity L-8-77-BS in Bering Sea, Alaska from 07/29/1977 to 08/21/1977

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Frequently anticipated questions:

What does this data set describe?

Title:
l877bs.m77t - MGD77 data file for Geophysical data from field activity L-8-77-BS in Bering Sea, Alaska from 07/29/1977 to 08/21/1977
Abstract:
Single-beam bathymetry, magnetics, and gravity data along with transit satellite navigation data was collected as part of field activity L-8-77-BS in Bering Sea, Alaska from 07/29/1977 to 08/21/1977, http://walrus.wr.usgs.gov/infobank/l/l877bs/html/l-8-77-bs.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/l877bs/html/l-8-77-bs.bath.html http://walrus.wr.usgs.gov/infobank/l/l877bs/html/l-8-77-bs.grav.html http://walrus.wr.usgs.gov/infobank/l/l877bs/html/l-8-77-bs.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, l877bs.m77t - MGD77 data file for Geophysical data from field activity L-8-77-BS in Bering Sea, Alaska from 07/29/1977 to 08/21/1977: 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: 176.71246
    East_Bounding_Coordinate: -152.02892
    North_Bounding_Coordinate: 64.48405
    South_Bounding_Coordinate: 54.18311
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 29-Jul-1977
    Ending_Date: 21-Aug-1977
    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: Bering Sea, 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?
    l877bs.m77t
    MGD77T single-beam bathymetry, gravity, and magnetics data file for l877bs (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:19770729
    Maximum:19770821
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.733
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:54.18317
    Maximum:64.48405
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-179.99989
    Maximum:179.99813
    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:5.058
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:22.5
    Maximum:3767.5
    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:50363
    Maximum:59597.7
    Units:gammas
    MAG_TOT2
    Magnetics total field - 2nd sensor (Source: NGDC)
    Range of values
    Minimum:48802
    Maximum:59721
    Units:gammas
    MAG_RES
    Magnetics residual field field (Source: NGDC)
    Range of values
    Minimum:-735.1
    Maximum:8907.2
    Units:gammas
    MAG_RESSEN
    SENSOR FOR RESIDUAL FIELD (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:1
    Units:1 - first sensor, 2 - second sensor, 9 - Unspecified
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:981489.4
    Maximum:982225.5
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-48.4
    Maximum:41
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-80.2
    Maximum:160.5
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:4
    Maximum:07F
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:19
    Maximum:7149
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    Bathymetry, magnetic, gravity, and navigation data for U.S. Geological Survey survey l877bs in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation, gravity, magnetics 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?
    Alan Cooper, Mike Marlow(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: 30-Oct-2000 (process 1 of 7)
    Navigation Data >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L877BS.N]L877BS.011; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > 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 2 of 7)
    Gravity Data >10/31/1998 /tiger/l/l877bs/grav/l-8-77-bs.165_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DUA0:[DATA.L877BS]L877BS.165; >DRB0:[CLINT]REFMTJCGRV.EXE; >reformatted from JChilds file l877.smgrv > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L877BS.N]L877BS.011; >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: 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: 21-Jun-2012 (process 3 of 7)
    Magnetics Data >06/21/2012 carolyn l-8-77-bs.260_011 > >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/l877bs/mag/l-8-77-bs.240_011 >/bear/programs/edit/automerge/automerge > >Converted to time format with year at start. > >01/02/86 CAROLYN DRS$DATA:[L877BS.M]L877BS.240; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 >212/1022-213/0104 was L877EG.DRCPF1.GRVMA1 on TAM302 >213/0104-213/1756 was F.3 from Clint >215/0526-216/0231 was L877EG.DRCPF1.GRVMA3 on TAM302 >216/0231-216/2350 was L877EG.DRCPF1.GRVMA4 on TAM303 >216/2350-218/0851 was L877EG.DRCPF1.GRVMA5 on TAM150 >218/0852-219/1907 was L877EG.DRCPF1.GRVMA6 on TAM150 >219/1907-221/0126 was L877EG.DRCPF1.GRVMA7 on TAM205 >221/0126-221/1540 was L877EG.DRCPF1.GRVMA8 on TAM205 >229/0610-229/1750 was L877EG.DRCPF1.GRVMA10 on TAM305 >229/1750-232/0817 was L877EG.DRCPF1.GRVMA11 on TAM301 >232/0817-232/1440 was L877EG.DRCPF1.GRVMA12 on TAM301 > >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L877BS.N]L877BS.011; >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: 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/l877bs/bath/l-8-77-bs.335_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >02/03/86 BECKIE DISK$USERDISK:[BECKIE.TEMP]L877BS.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >It was reduced with no Matthews area. Sound velocity >assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/24/86 KAYE DUA0:[DATA.L877BS.N]L877BS.011; >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: 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-8-77-bs.011 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707290240000 197708121458500 >197708121514300 197708121514300 >197708121529300 197708121529300 >197708121544300 197708121544300 >197708121559300 197708121559300 >197708121614300 197708121614300 >197708121629300 197708121629300 >197708121644300 197708121644300 >197708121659300 197708121659300 >197708121715100 197708171214200 >197708171247100 197708200109100 >197708200127040 197708211622000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-8-77-bs.165_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707300403420 197707300533480 >197707300542120 197708010156420 >197708010228300 197708010432420 >197708010857000 197708011425000 >197708011430120 197708011744180 >197708011806300 197708012344420 >197708020016420 197708022155120 >197708030446120 197708040603300 >197708040700300 197708041326300 >197708041544000 197708050906180 >197708050913180 197708052303300 >197708052317000 197708060059120 >197708060645180 197708062240300 >197708070315180 197708081540420 >197708081736480 197708090553180 >197708090602300 197708091540420 >197708092142420 197708100244420 >197708100806480 197708100958480 >197708101100480 197708102058480 >197708110834120 197708111226120 >197708111231180 197708120257300 >197708120324300 197708120500300 >197708120552300 197708130230180 >197708130346300 197708140558180 >197708140824180 197708150314420 >197708150814420 197708152358420 >197708160124420 197708162158420 >197708162206180 197708171210180 >197708171242120 197708171624120 >197708171722120 197708181246120 >197708181336120 197708190112120 >197708190135120 197708192203120 >197708200140000 197708201441000 >197708202131000 197708211359000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Magnetics Data (l-8-77-bs.260_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707311022060 197707311155080 >197707311218090 197708011756080 >197708030526220 197708041753570 >197708041801560 197708052055460 >197708052101460 197708060059530 >197708060720190 197708062236560 >197708070457410 197708070532050 >197708070549130 197708081539380 >197708081726090 197708081729210 >197708081738170 197708091540320 >197708170610350 197708180942470 >197708200141430 197708201440050 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-8-77-bs.335_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197707300628180 197707310019540 >197707310030360 197707312359180 >197708010009300 197708011014180 >197708011027360 197708011028540 >197708011041480 197708030827420 >197708051036180 197708051203240 >197708060102480 197708060211120 >197708060222060 197708060222060 >197708060232180 197708060641120 >197708062239060 197708070309420 >197708080902060 197708081132000 >197708081143540 197708081143540 >197708081156420 197708081734000 >197708102101240 197708110829300 >197708170335240 197708170512300 >197708170628540 197708170701240 >197708170740120 197708171932540 >197708171944240 197708181221180 >197708181234000 197708190122120 >197708192234240 197708192358480 >197708200144000 197708200158240 >197708201303180 197708202003240 >197708202013300 197708210542540 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-8-77-bs.422_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197708030735000 197708031949000 >197708032016000 197708040349000 >197708040419000 197708040731000 >197708040753000 197708041323000 >197708041506000 197708041658000 >197708041727000 197708041727000 >197708041751000 197708041751000 >197708041813000 197708041830000 >197708041856000 197708050132000 >197708050153000 197708051233000 >197708051254000 197708060100000 >197708060642000 197708062223000 >197708070302000 197708070302000 >197708070331000 197708070346000 >197708070408000 197708070917000 >197708070938000 197708071225000 >197708071246000 197708071355000 >197708071416000 197708080454000 >197708080523000 197708081542000 >197708081730000 197708081730000 >197708081755000 197708090137000 >197708090208000 197708090745000 >197708090831000 197708090831000 >197708090901000 197708090955000 >197708091017000 197708091544000 >197708101152000 197708101711000 >197708101732000 197708101732000 >197708101754000 197708101823000 >197708101844000 197708101844000 >197708101905000 197708101925000 >197708101946000 197708101956000 >197708102017000 197708102037000 >197708102058000 197708102058000 >197708110830000 197708111518000 >197708111551000 197708112052000 >197708112113000 197708120300000 >197708120320220 197708120449350 >197708120550090 197708130219200 >197708130345430 197708140601390 >197708140820000 197708141447000 >197708141508000 197708141710000 >197708141746000 197708142027000 >197708142052000 197708142136000 >197708142157000 197708150311000 >197708150810000 197708151417000 >197708151449000 197708151738000 >197708151807000 197708152039000 >197708152111000 197708152355000 >197708160122000 197708161830000 >197708161902000 197708162139000 >197708162212000 197708170332000 >197708170405000 197708170919000 >197708170946000 197708170946000 >197708171009000 197708171620000 >197708171802040 197708181239090 >197708181335000 197708192201520 >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_89-167/1312.faq.html>
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