l578bs.m77t - MGD77 data file for Geophysical data from field activity L-5-78-BS in Bering Sea, Alaska from 08/05/1978 to 08/09/1978

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Frequently anticipated questions:


What does this data set describe?

Title:
l578bs.m77t - MGD77 data file for Geophysical data from field activity L-5-78-BS in Bering Sea, Alaska from 08/05/1978 to 08/09/1978
Abstract:
Single-beam bathymetry and gravity data along with DGPS navigation data was collected as part of field activity L-5-78-BS in Bering Sea, Alaska from 08/05/1978 to 08/09/1978, http://walrus.wr.usgs.gov/infobank/l/l578bs/html/l-5-78-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/l578bs/html/l-5-78-bs.bath.html and http://walrus.wr.usgs.gov/infobank/l/l578bs/html/l-5-78-bs.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, l578bs.m77t - MGD77 data file for Geophysical data from field activity L-5-78-BS in Bering Sea, Alaska from 08/05/1978 to 08/09/1978: 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: -170.90368
    East_Bounding_Coordinate: -162.67679
    North_Bounding_Coordinate: 64.91867
    South_Bounding_Coordinate: 62.74943
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 05-Aug-1978
    Ending_Date: 09-Aug-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: 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?
    l578bs.m77t
    MGD77T single-beam bathymetry and gravity data file for L578BS (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:19780806
    Maximum:19780823
    Units:Year, month, day
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2359.633
    Units:hours and decimal minutes
    LAT
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:62.74957
    Maximum:64.9178
    Units:decimal degrees
    LON
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-170.90362
    Maximum:-162.67685
    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:0.011
    Maximum:0.071
    Units:seconds
    CORR_DEPTH
    Bathymetry, corrected depth (Source: U.S. Geological Survey)
    Range of values
    Minimum:8.2
    Maximum:53.3
    Units:decimal meters
    BAT_CPCO
    Bathymetric Correction code - details the procedure used for determining the sound velocity correction to depth (Source: NGDC)
    Range of values
    Minimum:63
    Maximum:63
    Units:01-55 Matthews' Zones with zone , 59 Matthews' Zones, no zone specified, 60 S. Kuwahara Formula, 61 Wilson Formula, 62 Del Grosso Formula, 63 Carter's Tables, 88 Other (see Add. Doc.), 97 Computed using 1500 meters/sec, 98 Unknown if Corrected, 99 Unspecified
    BAT_TYPCO
    Bathymetry type code - indicates how the bathymetric value was obtained (Source: NGDC)
    Range of values
    Minimum:1
    Maximum:3
    Units:1 - Observed, 3 - Interpolated (Header Seq. 12), 9 - Unspecified
    GRA_OBS
    Observed gravity (Source: NGDC)
    Range of values
    Minimum:982118.6
    Maximum:982295
    Units:milligals
    EOTVOS
    EOTVOS correction - E = 7.5 V cos(phi) * sin(alpha) + 0.0042 V*V (Source: NGDC)
    Range of values
    Minimum:-18.5
    Maximum:18.6
    Units:milligals
    FREEAIR
    Free-air Anomaly = G(observed) minus G(theoretical) (Source: NGDC)
    Range of values
    Minimum:-36.2
    Maximum:12.7
    Units:milligals
    Entity_and_Attribute_Overview:
    Bathymetry, gravity, and navigation data for U.S. Geological Survey bathymetry survey L578BS 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?
    Mike Fisher (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: 08-Apr-1996 (process 1 of 5)
    Navigation Data >04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]L-5-78-BS.010;1 >MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1 >Dead reckoning data > >Input was... >01/14/86 KAYE DUA0:[DATA.L478BS.N]L478BS.010; >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: 28-Oct-2008 (process 2 of 5)
    Gravity Data >10/28/2008 carolyn l-5-78-bs.160_010 >/infobank/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >05/02/86 CLINT DRS$DATA:[L478BS]L478BS.160; >DRB0:[CLINT]REFMTJCGRV.EXE; > >Input was... >04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]L-5-78-BS.010;1 >MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1 >Dead reckoning data > >01/14/86 KAYE DUA0:[DATA.L478BS.N]L478BS.010; >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: 03-Nov-2008 (process 3 of 5)
    Bathymetry Data >11/03/2008 jpaz /infobank/l/l578bs/bath/l-5-78-bs.335_010 >/infobank/programs/edit/automerge/automerge > >Input was... >Converted to time format with year at start. > >01/16/86 BECKIE DISK$USERDISK:[BECKIE.BAT360]L478BS.335; >DRB0:[DRS.BAT]BATRED.EXE;1 >I believe this file was hand-digetized in 2-way >traveltime(secs). Reduction used no Matthews correction >and assumed velocity of sound was 1500m/sec. > >Input was... >04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]L-5-78-BS.010;1 >MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1 >Dead reckoning data > >01/14/86 KAYE DUA0:[DATA.L478BS.N]L478BS.010; >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 5)
    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 5)
    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
  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-5-78-bs.010 [DRS]) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808051941400 197808062256000 >197808062358000 197808081228300 >197808081306400 197808081429100 >197808081501100 197808111727200 >197808111821200 197808141301200 >197808141337000 197808151920200 >197808152014200 197808152247400 >197808152325000 197808152352200 >197808160034400 197808161103500 >197808161132000 197808161532300 >197808161553500 197808162144300 >197808162212400 197808181506000 >197808181531000 197808181629000 >197808181704200 197808192119300 >197808192143000 197808201441300 >197808201505000 197808201628300 >197808201656100 197808210145500 >197808210321100 197808211230100 >197808211251300 197808220945500 >197808221007300 197808221112000 >197808221135400 197808221419500 >197808221444200 197808221609200 >197808221645100 197808222218100 >197808222242300 197808222328500 >197808230022000 197808231604000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Gravity Data (l-5-78-bs.160_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808060630000 197808060946420 >197808061001480 197808061345120 >197808061946180 197808062218420 >197808062230300 197808070641420 >197808070717420 197808070856420 >197808070935480 197808071342120 >197808071347180 197808071709120 >197808071716000 197808071841120 >197808071848000 197808080528120 >197808080603120 197808080740180 >197808080823300 197808090432300 >197808091240300 197808091846300 >197808091901120 197808100844180 >197808100922180 197808101016180 >197808101122300 197808101723420 >197808101756480 197808110140180 >197808110230300 197808110318300 >197808110350480 197808111108300 >197808111157300 197808111306420 >197808111339480 197808112013480 >197808112102000 197808112138000 >197808112216000 197808120410300 >197808120510300 197808120609420 >197808120649480 197808121132180 >197808121205180 197808121255180 >197808121338180 197808121601420 >197808121648420 197808121756480 >197808121847000 197808122343420 >197808130000420 197808131120480 >197808131154480 197808131229000 >197808131320000 197808131807000 >197808131816000 197808132244420 >197808132255480 197808140251420 >197808140331420 197808140431420 >197808140507480 197808150445300 >197808150531420 197808150823120 >197808150854120 197808151925000 >197808152005000 197808152143000 >197808152216000 197808152301000 >197808152309420 197808152351420 >197808160127180 197808160642000 >197808160856000 197808162213000 >197808162311120 197808162349180 >197808170029300 197808171321180 >197808171357180 197808171520180 >197808171558180 197808171744180 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Bathymetry Data (l-5-78-bs.335_010) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808061000000 197808061817000 >197808061833300 197808062025000 >197808062046300 197808070410540 >197808070422420 197808070817480 >197808070832300 197808071943360 >197808071953000 197808080855000 >197808080900360 197808081057000 >197808081116180 197808082218300 >197808082232420 197808090200000 >197808090217120 197808090440000 >197808091232420 197808091800060 >197808091810120 197808100119480 >197808100135000 197808101630000 >197808101644120 197808110500000 >197808110515420 197808110820000 >197808110832300 197808111954360 >197808112010420 197808112125000 >197808112132240 197808120533300 >197808120539000 197808120927540 >197808120935000 197808121125000 >197808121155000 197808121255000 >197808121302540 197808122000000 >197808122008420 197808130232180 >197808130246480 197808130330000 >197808130400240 197808131715000 >197808131725000 197808131754540 >197808131802300 197808140254000 >197808140302300 197808140730000 >197808140737300 197808140805000 >197808140815000 197808141506360 >197808141512540 197808141815000 >197808141821060 197808141955000 >197808142003540 197808142330000 >197808142341480 197808150315000 >197808150330000 197808151037360 >197808151044480 197808151217360 >197808151250000 197808151355000 >197808151415240 197808152042420 >197808152051000 197808160050000 >197808160101060 197808160310000 >197808160317120 197808160430000 >197808160437240 197808160803120 >197808160808180 197808160837360 >197808160856000 197808160925000 >197808160931300 197808161803180 >197808161811420 197808161930000 >197808161937360 197808171020000 >197808171025180 197808171055000 >197808171107240 197808171203120 >197808171208180 197808172005300 >197808172135000 197808180232240 >197808180245060 197808180557540 >197808180603060 197808181432480 >197808181438120 197808181517420 >197808181522480 197808181648240 >197808181655000 197808181747540 >197808181815060 197808182010000 >197808182015120 197808190422360 >197808190427480 197808190520000 >197808190525060 197808190728120 >197808190736060 197808190821420 >197808190831240 197808191000000 >197808191030000 197808191213060 >197808191218180 197808191733060 >197808191738120 197808192018000 >197808192025060 197808192233000 >197808192303240 197808200510000 >197808200515060 197808200915000 >197808200936240 197808201023060 >197808201028120 197808201430000 >197808201438540 197808201825000 >197808201835000 197808202145000 >197808202201060 197808210601540 >197808210608120 197808210617420 >197808210634180 197808210738060 >197808210746060 197808211712540 >197808211721420 197808212130000 >197808212137420 197808220403120 >197808220408180 197808220617420 >197808220623120 197808220852300 >197808220858240 197808221243000 >197808221316360 197808221835000 >197808221851180 197808221940000 >197808221950120 197808230400000 >197808230407120 197808230419240 >197808230424420 197808230424420 >197808230430000 197808230430000 >197808230435180 197808230439360 >197808230445000 197808230500000 >197808230509060 197808230509060 >197808230515000 197808231000000 >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >Seismic Shots Data (l-5-78-bs.410) >YYYYMMDDHHMMSST YYYYMMDDHHMMSST >197808060822360 197808061102070 >197808061128110 197808061326200 >197808061921070 197808062047170 >197808062053040 197808062103060 >197808062109410 197808062255530 >197808062358170 197808070142110 >197808070147470 197808070631420 >197808070940090 197808080501520 >197808080825260 197808081714370 >197808081719410 197808090431520 >197808091241390 197808100831470 >197808101050130 197808101315000 >197808101320090 197808101705560 >197808101830130 197808110135390 >197808110355140 197808111100380 >197808111320070 197808112006400 >197808112209570 197808120356510 >197808120635260 197808121121200 >197808121336080 197808121556290 >197808121850230 197808122114140 >197808122120400 197808122224020 >197808122230510 197808130321020 >197808130331090 197808130456550 >197808130503590 197808130926550 >197808131312000 197808140245160 >197808140436160 197808140643130 >197808140650280 197808150415460 >197808150825310 197808151132500 >197808151155430 197808152130070 >197808160100040 197808160100040 >197808160405500 197808160405500 >197808160538030 197808160538030 >197808160616370 197808160616370 >197808160640130 197808160640130 >197808160855190 197808162156250 >197808170034210 197808171311080 >197808171615200 197808180535480 >197808180855330 197808181202330 >197808181209520 197808181249160 >197808181409010 197808181931090 >197808182220010 197808190348520 >197808190418150 197808191041510 >197808191329560 197808191802030 >197808191950130 197808192250110 >197808192320100 197808201341500 >197808201510210 197808201645320 >197808201706130 197808210145430 >197808210321230 197808210735440 >197808210910420 197808211632380 >197808211720130 197808221251230 >197808221312140 197808230022000 >197808230255140 197808230604150 >197808230611530 197808230951360 >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: 01-Feb-2017
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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