l678ar.m77t - MGD77 data file for Geophysical data from field activity L-6-78-AR in Arctic from 08/26/1978 to 09/20/1978

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Frequently anticipated questions:

What does this data set describe?

Title:
l678ar.m77t - MGD77 data file for Geophysical data from field activity L-6-78-AR in Arctic from 08/26/1978 to 09/20/1978
Abstract:
Single-beam bathymetry and gravity data along with DGPS navigation data was collected as part of field activity L-6-78-AR in Arctic from 08/26/1978 to 09/20/1978, http://walrus.wr.usgs.gov/infobank/l/l678ar/html/l-6-78-ar.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/l678ar/html/l-6-78-ar.bath.html and http://walrus.wr.usgs.gov/infobank/l/l678ar/html/l-6-78-ar.grav.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, l678ar.m77t - MGD77 data file for Geophysical data from field activity L-6-78-AR in Arctic from 08/26/1978 to 09/20/1978: 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: -176.25916
    East_Bounding_Coordinate: -157.17506
    North_Bounding_Coordinate: 73.13313
    South_Bounding_Coordinate: 64.47219
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 26-Aug-1978
    Ending_Date: 20-Sep-1978
    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: Arctic
      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?
    l678ar.m77t
    MGD77T single-beam bathymetry and gravity data file for L678AR (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:19780826
    Maximum:19780920
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.9
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:64.47226
    Maximum:73.13309
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-176.25915
    Maximum:-157.17507
    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:0.033
    Maximum:0.365
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:24.7
    Maximum:263.8
    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
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:981333.5
    Maximum:982975
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-40.2
    Maximum:39.7
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-52.4
    Maximum:791.2
    Units:milligals
    LINEID
    LINE/TRACK/SEGMENT ID (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:909
    Units:Used, for example, to cross reference with seismic data.
    POINTID
    SEISMIC SHOT-POINT NUMBER/POINT ID (Source: NGDC)
    Range of values
    Minimum:40
    Maximum:10623
    Units:Used, for example, to cross reference with seismic data.
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, and navigation data for U.S. Geological Survey bathymetry survey L678AR in MGD77T format.
    Entity_and_Attribute_Detail_Citation:
    Attributes are obtained from MGD77T data files created from the navigation, gravity, 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?
    Art Grantz (Chief Scientist)
  3. To whom should users address questions about the data?
    Gregory K. Miller
    U.S. Geological Survey
    Physical Scientist
    600 4th Street South
    St. Petersburg, FL
    USA

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

Why was the data set created?

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

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 19-Jan-1996 (process 1 of 6)
    Navigation Data >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L678AR.N]L678AR.011; >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 6)
    Gravity Data >10/31/1998 /tiger/l/l678ar/grav/l-6-78-ar.161_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >12/05/85 BARB DUA0:[DATA.L678AR.G]L678AR.161; >DRB0:[DRS.REFMT]REFORMAT.EXE;5 > >Input was... >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L678AR.N]L678AR.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: 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 3 of 6)
    Bathymetry Data >10/31/1998 /tiger/l/l678ar/bath/l-6-78-ar.336_011 >/bear/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >01/16/86 BECKIE DISK$USERDISK:[BECKIE.BAT360]L678AR.336; >DRB0:[DRS.BAT]BATRED.EXE;1 >This file was hand-digetized in 2-way traveltime(secs). >Reduction used no Matthews correction and sound velocity >assumed was 1500m/sec. > >Input was... >Converted to time format with year at start. > >01/15/86 KAYE DUA0:[DATA.L678AR.N]L678AR.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: 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 4 of 6)
    MGD77 file creation - The available data for each cruise leg are re-formatted and combined into the Marine Geophysical Data Exchange Format (MGD77) and into the internal NGDC SEIS-NAV format by USGS using several USGS developed FORTRAN programs.The FORTRAN programs sample the navigation to every integer minute of the cruise. When necessary, the latitudes and longitudes are linearly interpolated. If the time between the actual navigation fixes exceeds five minutes, no data are included in the MGD77 file.To build the MGD77 file, gravity, magnetics, and bathymetry are added to this sampled navigation. When necessary, gravity, magnetics, and bathymetry data are linearly interpolated if the time between the actual data samples does not exceed five minutes. If a time gap exceeds this, the data are not reported.The navigation data are merged with the seismic shot point data in a SEIS- NAV format file. For this file, navigation data are interpolated for each shot point. Both types of files are written to magnetic tape and sent to NGDC. Person who carried out this activity:
    U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
    Attn: Carolyn H. Degnan
    Geophysicist
    USGS Pacific Coastal & Marine Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA
    USA

    (831) 460-7452 (voice)
    (831) 427-4748 (FAX)
    infobank@octopus.wr.usgs.gov
    Date: 01-Feb-2017 (process 5 of 6)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 19-Oct-2020 (process 6 of 6)
    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-6-78-ar.011 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808262100400 197809100206000 >197809100221000 197809100221000 >197809100236000 197809100236000 >197809100251000 197809100251000 >197809100306000 197809100306000 >197809100321000 197809100321000 >197809100336000 197809100336000 >197809100351000 197809100351000 >197809100406000 197809100406000 >197809100421000 197809100421000 >197809100436000 197809100436000 >197809100451000 197809100451000 >197809100507150 197809100536200 >197809100552320 197809100605320 >197809100624250 197809100635430 >197809100652260 197809100705200 >197809100743470 197809100749300 >197809100826080 197809100826080 >197809100841330 197809120713470 >197809120724100 197809121552100 >197809121605500 197809141408500 >197809141420200 197809151107500 >197809151122100 197809162203200 >197809162219180 197809162219180 >197809162234180 197809162234180 >197809162249180 197809162249180 >197809162304180 197809162304180 >197809162319180 197809162319180 >197809162334180 197809162334180 >197809162349180 197809162349180 >197809170004180 197809170004180 >197809170019180 197809170019180 >197809170034180 197809170034180 >197809170049180 197809170049180 >197809170104180 197809170109180 >197809170124180 197809170124180 >197809170139180 197809170139180 >197809170154180 197809170154180 >197809170209180 197809170209180 >197809170220400 197809172305000 >197809172327400 197809181340000 >197809181354400 197809181722400 >197809181735200 197809191700100 >197809191711100 197809191725100 >197809191735500 197809192141100 >197809192154300 197809192212300 >197809192223100 197809200025100 >197809200036300 197809200104300 >197809200119300 197809200531300 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-6-78-ar.161_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808262101000 197808310339000 >197808310356120 197808311235120 >197808311250180 197809021100420 >197809021108300 197809021108300 >197809021125000 197809021327000 >197809021523120 197809021526120 >197809021537420 197809021541240 >197809021714420 197809040705120 >197809040710180 197809051335180 >197809051344300 197809051731300 >197809051737000 197809061623180 >197809061645480 197809100116180 >197809100502120 197809100514540 >197809100520300 197809100533000 >197809100547300 197809100555000 >197809100600300 197809100600300 >197809100619240 197809100631000 >197809100647240 197809100647240 >197809100655360 197809100701420 >197809100738480 197809100738480 >197809100744300 197809100744300 >197809100821060 197809100821060 >197809100836300 197809120702480 >197809120708480 197809120708480 >197809120719120 197809141404480 >197809141415180 197809162159000 >197809170215420 197809172308420 >197809172318420 197809190215420 >197809190224120 197809200523480 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-6-78-ar.336_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808280100000 197808281414540 >197808281425540 197808291447060 >197808291525360 197808291615000 >197808291635000 197808301023300 >197808301058120 197808301440180 >197808301500000 197808302200000 >197808310015360 197808310415000 >197808310425540 197808311239480 >197808311316060 197809010229000 >197809010302000 197809011200000 >197809011216540 197809011216540 >197809011227240 197809011227240 >197809011239540 197809011246240 >197809011258420 197809011258420 >197809011309540 197809011309540 >197809011320000 197809011603180 >197809011615120 197809012217120 >197809012230000 197809012230000 >197809012245360 197809012245360 >197809012258300 197809021323300 >197809021406540 197809021516180 >197809021527240 197809022238420 >197809022318360 197809031444120 >197809031504120 197809041834360 >197809041846420 197809042136120 >197809042146240 197809050543060 >197809050615000 197809051332540 >197809051344480 197809060037360 >197809060559180 197809061834540 >197809061907480 197809062329420 >197809070147120 197809071943480 >197809072010120 197809082025240 >197809082053180 197809091745000 >197809091830000 197809092232000 >197809092246300 197809102243300 >197809102258420 197809120018120 >197809120034420 197809142151300 >197809142209240 197809152201480 >197809152219420 197809162143120 >197809162207420 197809172143240 >197809172200000 197809182211060 >197809182239360 197809190457060 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-6-78-ar.420_011) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808271720040 197808271720040 >197808271725490 197808272145060 >197808272151060 197808272200210 >197808272206130 197808280910040 >197808281023010 197808281755250 >197808281806050 197808281956200 >197808282001390 197808301902100 >197808301908430 197808301930070 >197808301935360 197808302027400 >197808302034210 197808302034210 >197808302040290 197808310151470 >197808310201560 197808310242410 >197808310247430 197808310247430 >197808310253470 197808310253470 >197808310300080 197808310300080 >197808310305380 197808310305380 >197808310310510 197808310502050 >197808310507060 197808310507060 >197808310514360 197808310514360 >197808310522360 197808310522360 >197808310530190 197808310530190 >197808310536120 197808311305440 >197808311316000 197808311924340 >197808311933400 197809010253080 >197809010302300 197809011237070 >197809011243130 197809011616310 >197809011622520 197809012257370 >197809012302480 197809020241280 >197809020247480 197809021109220 >197809021129540 197809021312530 >197809021406370 197809021911360 >197809021917440 197809022236490 >197809022319050 197809041220120 >197809041433020 197809050203390 >197809050300340 197809050441520 >197809050605050 197809051747330 >197809051753500 197809051753500 >197809051758580 197809051909180 >197809051914340 197809051919310 >197809051924330 197809051924330 >197809051929430 197809052049280 >197809052054440 197809052059360 >197809052104390 197809052143100 >197809052148130 197809052152570 >197809052157580 197809052207570 >197809052213330 197809052213330 >197809052219110 197809052224110 >197809052229210 197809052229210 >197809052234270 197809052250500 >197809060900100 197809062353510 >197809062359170 197809070302380 >197809070349160 197809071130320 >197809071308380 197809080102010 >197809080108350 197809080108350 >197809080115050 197809080130480 >197809080150080 197809080218270 >197809080224360 197809080249320 >197809080255490 197809080324030 >197809080330140 197809080354420 >197809080400470 197809080430570 >197809080436480 197809080502200 >197809080508500 197809080555380 >197809080601550 197809080626590 >197809080633170 197809080645520 >197809080651520 197809080701000 >197809080707100 197809080716240 >197809080722370 197809080732020 >197809080738220 197809080754110 >197809080800290 197809080810000 >197809080816180 197809080825320 >197809080831460 197809080841060 >197809080847210 197809081533490 >197809081732470 197809090153560 >197809090242280 197809092233040 >197809092325360 197809100212230 >197809100304260 197809101540410 >197809101630290 197809102035320 >197809102141150 197809111135510 >197809111142150 197809111203230 >197809111209290 197809111609120 >197809111615460 197809121040550 >197809121945330 197809122209510 >197809122214520 197809131257440 >197809131330360 197809131505200 >197809140335210 197809140349470 >197809140402300 197809140719520 >197809140729090 197809140925180 >197809141004470 197809150047270 >197809150144410 197809152355300 >197809160001330 197809161537380 >197809161630250 197809162137040 >197809162145440 197809170047150 >197809170053350 197809170424080 >197809170430270 197809170652130 >197809170658320 197809171011540 >197809171021300 197809171034220 >197809171040480 197809171113160 >197809171155370 197809180759510 >197809180817490 197809190459010 >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)
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  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)
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