d179eg.m77t and d179eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity D-1-79-EG in the Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979

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Frequently anticipated questions:

What does this data set describe?

Title:
d179eg.m77t and d179eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity D-1-79-EG in the Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979
Abstract:
Single-beam bathymetry data along with SINS navigation data was collected as part of the U.S. Geological Survey cruise D-1-79-EG. The cruise was conducted in the Eastern Gulf of Alaska from May 24 to June 1, 1979. The chief scientists were Bruce Molnia from the USGS Coastal and Marine Geology office in Menlo Park, CA and Mark Wheeler. The purpose of this cruise was to collect sediment samples and cores for a microfossil study. The geophysical source was a 3.5 kilohertz (kHz) bathymetry system. 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/d/d179eg/html/d-1-79-eg.meta.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 collected using a Shipboard Integrated Navigation System (SINS). used Transit satellite navigation and a number of subsystems that were used in dead reckoning between satellite fixes. These included Doppler sonar, speed-of-sound velocimeter, water temperature sensor, gyrocompass, electromagnetic speed log, radionavigation and other subsystems. SINS was highly variable and at best there was a 50 m accuracy. The Data Acquisition, 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 (.0xx, .6xx) space-delimited ASCII data file. The header information rows are indicated by lines beginning with the character "!". The single-beam bathymetry data are collected as analog records with a 3.5 kHz system and hand-digitized. The bathymetry datasets were commonly processed using three programs: (A) Batred, which calculates depth from travel times; (B) nosamebathy, which eliminates identical adjacent bathymetry values; and (C) nozerobathy, which removes records with a depth value of "0.0". However, not all of the datasets included in this report were processed with one or more of these programs. If the data was not run through these programs it was reformatted using the most recent "best file" on InfoBank, often these were categorized by InfoBank as raw bathymetry files. Details about which processing steps were taken by the DAPS group can be found in the header information of the bathymetry and navigation ASCII files downloaded from InfoBank. Prior to reformatting the data into MGD77T format the "best" bathymetry and navigation files from InfoBank were edited to remove the header information and reformatted using Excel 2010 to separate the data into columns based on tabs. Next the bathymetry and navigation files were merged based on time and latitude and longitude. The combined navigation and bathymetry was saved as a .txt file. This combined bathymetry and navigation file was used as an input file into the GEODAS ReFormat to MDG77T program developed by NOAA's NGDC. The program outputs the reformatted data as a tab-delimited .m77t file. The program is available for use at: http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html. For information regarding fields found within the MGD77T files, please refer to the publication, Hittelman and others (2010), found within the Cross-reference section of this metadata file. Each MGD77T data file also has an accompanying header file (.h77t). The fields within these header files are also defined in the aforementioned publication. Fields are populated based on InfoBank metadata records, digital data file headers, and accompanying publications (often cruise reports) for the survey. If a field is unknown or did not apply to the dataset it is intentionally left blank.
  1. How might this data set be cited?
    U.S. Geological Survey, and Coastal and Marine Geology Program, 2013, d179eg.m77t and d179eg.h77t: MGD77T data and header files for single-beam bathymetry data for field activity D-1-79-EG in the Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979: U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

    This is part of the following larger work.

    Schreppel, Heather A., Degnan, Carolyn H., Metzger, Dan R., and Dadisman, Shawn V., 2013, Archive of U.S. Geological Survey selected single-beam bathymetry datasets, 1969-2000: U.S. Geological Survey Data Series 757, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -142.00000
    East_Bounding_Coordinate: -135.00000
    North_Bounding_Coordinate: 60.00000
    South_Bounding_Coordinate: 57.25000
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 24-May-1979
    Ending_Date: 01-Jun-1979
    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: Eastern Gulf of Alaska from 05/24/1979 to 06/01/1979
      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 North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    d179eg.m77t
    MGD77T single-beam bathymetry data file for D179EG (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
    Survey Date (Source: NGDC)
    Range of values
    Minimum:19790525
    Maximum:19790601
    Units:YYYYMMDD, (four digit year, two digit month, two digit day)
    TIME
    Time (Source: NGDC)
    Range of values
    Minimum:0
    Maximum:2356
    Units:hours and decimal minutes
    LAT
    Latitude (Source: North American Datum of 1927 (Clarke 1866) Geographic Coordinate System)
    Range of values
    Minimum:57.005
    Maximum:59.76
    Units:decimal degrees
    LON
    Longitude (Source: North American Datum of 1927 (Clarke 1866) Geographic Coordinate System)
    Range of values
    Minimum:-141.66167
    Maximum:-117.13802
    Units:decimal degrees
    POS_TYPE
    Indicates how lat/lon was obtained (Source: NGDC)
    ValueDefinition
    1Observed fix
    3Interpolated fix
    nilunspecified
    BAT_TTIME
    Bathymetry, 2-way travel time (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.03373
    Maximum:4.42373
    Units:seconds
    d179eg.h77t
    MGD77T single-beam bathymetry header file for D-1-79-EG (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
    FORMAT_77
    Format Acronym (Source: NGDC) Text string description
    PARAMS_CO
    Parameters surveyed codes. (Source: NGDC) Status of geophysical parameters for this survey. See Hittelman and others (2010) from the Cross_Reference section above for details.
    INST_SRC
    Source Institution (Source: NGDC) Text string description
    COUNTRY
    Country (Source: NGDC) Text string description
    PLATFORM
    Platform name (Source: NGDC) Text string description
    PLAT_TYPCO
    Platform type code (Source: NGDC)
    ValueDefinition
    nilUnspecified
    1Surface Ship
    2Submersible Ship
    3Aircraft
    4Buoy
    5Mobile land
    6Fixed land
    7Deep tow
    PLAT_TYP
    Platform type (Source: NGDC) Text string description
    CHIEF
    Chief Scientist(s) (Source: NGDC) Text string description
    PROJECT
    Project, cruise, leg (Source: NGDC) Text string description
    FUNDING
    funding (Source: NGDC) Text string description
    DATE_DEP
    survey departure date (Source: NGDC)
    Range of values
    Minimum:19770427
    Maximum:20000629
    Units:YYYYMMDD (four digit year, two digit month, two digit day)
    PORT_DEP
    port of departure (Source: NGDC) Text string description
    DATE_ARR
    survey arrival date (Source: NGDC)
    Range of values
    Minimum:19770427
    Maximum:20000629
    Units:YYYYMMDD (four digit year, two digit month, two digit day)
    PORT_ARR
    port of arrival (Source: NGDC) Text string description
    NAV_INSTR
    navigation instrumentation (Source: NGDC) Text string description
    POS_INFO
    position determination method/ geodetic datum (Source: NGDC) Text string description
    BATH_INSTR
    bathymetry instrumentation (Source: NGDC) Text string description
    BATH_ADD
    additional forms of bathymetry (Source: NGDC) Text string description
    LAT_TOP
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:16.38240
    Maximum:89.98766
    Units:decimal degrees
    LAT_BOTTOM
    Latitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:16.38240
    Maximum:89.98766
    Units:decimal degrees
    LON_LEFT
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:10.30551
    Maximum:-117.13802
    Units:decimal degrees
    LON_RIGHT
    Longitude (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:10.30551
    Maximum:-117.13802
    Units:decimal degrees
    BATH_DRATE
    general digitizing rate of bathymetry (Source: NGDC) Text string description
    SOUND_VEL
    assumed sound velocity (Source: NGDC) Text string description
    VDATUM_CO
    bathymetric vertical datum (Source: NGDC) In our datasets, no correction was applied. All values equal 0.
    Entity_and_Attribute_Overview:
    Bathymetry and navigation data for U.S. Geological Survey bathymetry survey D-1-79-EG 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. The MGD77T format contains more attributes than defined here. Attributes that were null for this data were not included. Details about other attributes can be found in Hittelman and others (2010), 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?
    Mark Wheeler (Chief Scientist); Bruce Molnia (Chief Scientist, USGS Western Region)
  3. To whom should users address questions about the data?
    Heather A. Schreppel
    Cherokee Nation Technology Solutions, contracted to U.S. Geological Survey
    IT Management Specialist/Database Support Assistant
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3013 (voice)
    hschreppel@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 9)
    Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank. Navigation Data 
    04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]D-1-79-EG.051;1
MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1
Integrated navigation (SINS) data

Input was...
01/06/86 KAYE DISK$USERDISK:[KAYE.MISCLEE]D179EG.050;
DRB0:[DRS.REFMT]REFORMAT.EXE;5
Original filename d179eg.nav.
    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 9)
    Below are the details about which processing steps were taken by the DAPS group that can be found in the header information of the ASCII files downloaded from InfoBank. Bathymetry Data 
    10/31/1998  /lion/d/d179eg/bath/d-1-79-eg.305_051
/bear/programs/edit/automerge/automerge

Input was...
04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]D-1-79-EG.305;1
MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1
Raw depth (bathymetry) data

02/24/86 BECKIE DISK$USERDISK:[CLINT.BECKIE]D179EG.305;
DRB0:[DRS.REFMT]REFORMAT.EXE;5

Input was...
04/08/96 CLINT MOG$DUB3:[PMG.CLINT.SHARK]D-1-79-EG.051;1
MOG$DUB0:[PROGRAMS.REFMT]VMS2UNIX.EXE;1
Integrated navigation (SINS) data

01/06/86 KAYE DISK$USERDISK:[KAYE.MISCLEE]D179EG.050;
DRB0:[DRS.REFMT]REFORMAT.EXE;5
Original filename d179eg.nav.

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: 2012 (process 3 of 9)
    A navigation file identified as the best available version in InfoBank for this cruise was copied and saved as an ASCII text file to be combined with the best available bathymetry file for processing to MGD77T format. For details regarding processing steps performed on these best available files from InfoBank, please see the header information within the original files at http://walrus.wr.usgs.gov/infobank/ and previous processing steps. Person who carried out this activity:
    Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
    Attn: Heather A. Schreppel
    IT Management Specialist/Database Support Assistant
    600 4th Street South
    St. Petersburg, FL
    USA

    727-803-8747 ext. 3013 (voice)
    hschreppel@usgs.gov
    Data sources used in this process:
    • d-1-79-eg.051.txt
    Data sources produced in this process:
    • d179egnav.txt
    Date: 2012 (process 4 of 9)
    A bathymetry file identified as the best available version in InfoBank for this cruise was copied and saved as an ASCII text file to be combined with the best available navigation file for processing to MGD77T format. For details regarding processing steps performed on these best available files from InfoBank, please see the header information within the original files at http://walrus.wr.usgs.gov/infobank/. Person who carried out this activity:
    Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
    Attn: Heather A. Schreppel
    IT Management Specialist/Database Support Assistant
    600 4th Street South
    St. Petersburg, FL
    USA

    727-803-8747 ext. 3013 (voice)
    hschreppel@usgs.gov
    Data sources used in this process:
    • d-1-79-eg.305_051.txt
    Data sources produced in this process:
    • d179egbathy.txt
    Date: 2012 (process 5 of 9)
    The best available bathymetry and navigation text files were concatenated into one tab-delimited file using Excel 2010 and several Visual Basic Applications (VBA) macros. InfoBank header information is removed and text is broken into columns and the rows are combined based on the presence of the same values in the time and latitude and longitude columns. Person who carried out this activity:
    Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
    Attn: Heather A. Schreppel
    IT Management Specialist/Database Support Assistant
    600 4th Street South
    St. Petersburg, FL
    USA

    727-803-8747 ext. 3013 (voice)
    hschreppel@usgs.gov
    Data sources used in this process:
    • d179egbathy.txt, d179egnav.txt
    Data sources produced in this process:
    • d179egall.txt
    Date: 2012 (process 6 of 9)
    The combined bathymetry and navigation file was used as an input file into the GEODAS ReFormat to MDG77T program developed by NOAA's NGDC. The program outputs the reformatted data as a tab-delimited .m77t file. The program is available for use at: http://www.ngdc.noaa.gov/mgg/gdas/gx_announce.Html Person who carried out this activity:
    Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
    Attn: Heather A. Schreppel
    IT Management Specialist/Database Support Assistant
    600 4th Street South
    St. Petersburg, FL
    USA

    727-803-8747 ext. 3013 (voice)
    hschreppel@usgs.gov
    Data sources used in this process:
    • d179egall.txt
    Data sources produced in this process:
    • d179eg.m77t
    Date: 2012 (process 7 of 9)
    To create the accompanying header files (.h77t), an excel spreadsheet was supplied from NGDC with already populated required field names. For information for header field requirements and definitions see: http://www.ngdc.noaa.gov/mgg/dat/geodas/docs/mgd77.pdf. When creating a header file for each cruise, fields were populated in the header spreadsheet based on InfoBank metadata records, digital data file headers, and accompanying publications (often cruise reports) for the survey. If a field was unknown or did not apply to the dataset it was intentionally left blank. Person who carried out this activity:
    Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
    Attn: Heather A. Schreppel
    IT Management Specialist/Database Support Assistant
    600 4th Street South
    St. Petersburg, FL
    USA

    727-803-8747 ext. 3013 (voice)
    hschreppel@usgs.gov
    Data sources used in this process: Data sources produced in this process:
    • d179eg.h77t
    Date: 29-Dec-2016 (process 8 of 9)
    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: 13-Oct-2020 (process 9 of 9)
    Added keywords section with USGS persistent identifier as theme keyword. 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 according to DAPS group. Reasons for gaps in data varies by cruise, see InfoBank for more details. 
    Navigation Data (d-1-79-eg.051 [SINS])
YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
197905251000000    197905301211000
197905301253000    197905301443000
197905301532000    197905301701000
197905301745000    197905301820000
197905301901000    197905301901000
197905301945000    197905310931000
197905311015000    197905311030000
197905311127000    197905311127000
197905311323000    197905311323000
197905311945000    197906011350000
YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
Bathymetry Data (d-1-79-eg.305_051)
YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
197905251000000    197905251145000
197905251230000    197905251305000
197905251350000    197905251425000
197905251525000    197905251605000
197905251645000    197905251725000
197905251805000    197905251910000
197905251950000    197905252020000
197905252100000    197905252115000
197905252130000    197905252145000
197905252210000    197905252230000
197905252300000    197905252310000
197905252335000    197905252340000
197905260000000    197905260015000
197905260040000    197905260135000
197905260220000    197905260225000
197905260250000    197905260305000
197905260335000    197905260350000
197905260420000    197905260425000
197905260510000    197905260635000
197905260745000    197905260750000
197905260835000    197905260855000
197905260935000    197905261000000
197905261035000    197905261125000
197905261155000    197905261250000
197905261325000    197905261710000
197905261830000    197905261850000
197905261925000    197905261950000
197905262015000    197905262045000
197905262120000    197905262145000
197905262210000    197905262245000
197905262330000    197905270005000
197905270100000    197905270115000
197905270125000    197905270130000
197905270750000    197905270810000
197905270945000    197905271015000
197905271055000    197905271115000
197905271155000    197905271215000
197905271255000    197905271330000
197905271400000    197905271425000
197905271455000    197905271515000
197905271540000    197905271605000
197905271645000    197905271700000
197905271730000    197905271835000
197905271930000    197905271945000
197905272045000    197905272115000
197905272155000    197905272215000
197905272245000    197905272305000
197905272345000    197905280005000
197905280045000    197905280100000
197905280140000    197905280215000
197905280255000    197905280315000
197905280410000    197905280420000
197905280505000    197905280540000
197905280635000    197905280655000
197905280750000    197905280815000
197905280900000    197905280930000
197905281030000    197905281050000
197905281100000    197905281105000
197905281235000    197905281305000
197905281425000    197905281500000
197905281630000    197905281655000
197905281840000    197905281900000
197905281945000    197905282020000
197905282050000    197905282115000
197905282150000    197905282220000
197905282250000    197905282320000
197905282350000    197905290020000
197905290050000    197905290130000
197905290210000    197905290235000
197905290305000    197905290400000
197905290430000    197905290500000
197905290530000    197905290600000
197905290650000    197905290740000
197905290820000    197905290840000
197905290920000    197905290945000
197905291320000    197905291405000
197905291530000    197905291555000
197905291715000    197905291735000
197905291820000    197905291850000
197905291925000    197905292000000
197905292105000    197905292125000
197905292200000    197905292235000
197905292305000    197905292345000
197905300020000    197905300050000
197905300125000    197905300150000
197905300230000    197905300305000
197905300340000    197905300450000
197905300530000    197905300610000
197905300655000    197905300720000
197905300825000    197905300900000
197905300945000    197905301030000
197905301115000    197905301150000
197905301200000    197905301200000
197905301210000    197905301210000
197905301330000    197905301415000
197905301535000    197905301625000
197905301745000    197905301820000
197905301945000    197905302025000
197905302055000    197905302125000
197905302205000    197905302235000
197905302320000    197905302345000
197905310025000    197905310055000
197905310140000    197905310235000
197905310330000    197905310415000
197905310520000    197905310545000
197905310650000    197905310715000
197905310800000    197905310830000
197905310850000    197905310855000
197905311945000    197906010100000
197906010110000    197906010430000
197906010500000    197906010535000
197906010555000    197906010645000
197906010705000    197906010945000
197906010955000    197906011345000
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.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
Heather A. Schreppel
Cherokee Nation Technology Solutions, contracted to the U.S. Geological Survey
IT Management Specialist/Database Support Assistant
U.S. Geological Survey, 600 Fourth Street South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3013 (voice)
hschreppel@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/DS757_d179eg.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:48 2021