FARN85-2PNTS.SHP - Hourly Time Fixes for GLORIA Cruise Farn85-2 (WHSC 85028)

Metadata also available as - [Outline] - [Parseable text]

Frequently-anticipated questions:

What does this data set describe?

Title:
FARN85-2PNTS.SHP - Hourly Time Fixes for GLORIA Cruise Farn85-2 (WHSC 85028)
Abstract:
This GIS overlay is a component of the U.S. Geological Survey, Woods Hole Science Center's, Gulf of Mexico GIS database. The Gulf of Mexico GIS database is intended to organize and display USGS held data and provide on-line (WWW) access to the data and/or metadata.
  1. How should this data set be cited?

    Twichell, D., 2005, FARN85-2PNTS.SHP - Hourly Time Fixes for GLORIA Cruise Farn85-2 (WHSC 85028): Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Twichell, D.C., Cross, V.A., Paskevich, V.F., Hutchinson, D.R., Winters, W.J., and Hart, P.E., 2005, GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey: Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -90.609500
    East_Bounding_Coordinate: -85.143000
    North_Bounding_Coordinate: 29.204300
    South_Bounding_Coordinate: 25.096900

  3. What does it look like?

    http:/pubs.usgs.gov/of/2005/1071/data/seismic/1982_1985/nav/farn85-2pnts/farn85-2pnts.gif (GIF)
    Browse image showing overview of data extent and coverage.
    http:/pubs.usgs.gov/of/2005/1071/data/seismic/1982_1985/nav/farn85-2pnts/farn85-2pnts-thumb.gif (GIF)
    Thumbnail image showing overview of data extent and coverage.

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 06-Sep-1985
    Ending_Date: 28-Sep-1985
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (529)

    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 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    farn85-2pnts
    Shapefile Attribute Table (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    LONGITUDE
    longitude in decimal degrees (Source: USGS)

    Range of values
    Minimum:-90.60950
    Maximum:-85.14300
    Units:decimal degrees
    Resolution:.0001

    LATITUDE
    Latitude in decimal degrees (Source: USGS)

    Range of values
    Minimum:25.09690
    Maximum:29.20430
    Units:decimal degrees
    Resolution:.0001

    YEAR
    Year of cruise (Source: USGS)

    Range of values
    Minimum:1985
    Maximum:1985
    Units:integer count
    Resolution:1

    MONTH
    Month (Source: USGS)

    Range of values
    Minimum:9
    Maximum:9
    Units:integer count
    Resolution:1

    DAY
    Day of the month (Source: USGS)

    Range of values
    Minimum:6
    Maximum:28
    Units:integer count
    Resolution:1

    JDAY
    Julian day (Source: USGS)

    Range of values
    Minimum:279
    Maximum:301
    Units:integer count
    Resolution:1

    HR
    Hour (Source: USGS)

    Range of values
    Minimum:0
    Maximum:23
    Units:integer count
    Resolution:1

    MIN
    Minute (Source: USGS)

    Range of values
    Minimum:0
    Maximum:8
    Units:integer count
    Resolution:1

    SEC
    Seconds (Source: USGS)

    Range of values
    Minimum:0
    Maximum:0
    Units:integer count
    Resolution:1

    UNCDEPTH
    Uncorrected depth assuming velocity of sound of 1500 m/sec (Source: USGS)

    Range of values
    Minimum:0
    Maximum:3501
    Units:meters
    Resolution:1

    CORDEPTH
    Corrected depth using Carter's tables (Source: USGS)

    Range of values
    Minimum:0
    Maximum:3510
    Units:meters
    Resolution:1

    LABEL
    Time stamp (Source: USGS)

    Character string in the form of JDAY:HH:MM

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Dave Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This GIS data overlay is a point shapefile of hourly time fixes for GLORIA cruise Farn85-2 (WHSC 85028).

How was the data set created?

  1. From what previous works were the data drawn?

    FARN85-1.DAT (source 1 of 1)
    Twichell, D., and Paskevich, V., 1996, GLORIA sidescan sonar and navigation field data collected in the Gulf of Mexico: Open-File Report 96-707, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Type_of_Source_Media: CD-ROM
    Source_Contribution:
    The ASCII text file containing hourly time fixes were copied from the publication CD-ROM and used to create the GIS data layer.

  2. How were the data generated, processed, and modified?

    Date: 02-Aug-2005 (process 1 of 3)
    Navigation data copied from Open-File Report 96-707 where it was stored as an ASCII file (FARN85-2.DAT), imported to Microsoft Excel where a header was added to identify the fields, and hourly fixes were selected from the two-minute fix navigation. The data were exported form Excel as a comma delimited text file that was named farn85-2_hr.txt. The identification of the fields are: 1. Latitude, 2. Longitude, 3. Year, 4. Month, 5. Day, 6. Hour, 7. Minute, 8. Second, 9. Depth (m-corr) - correction using Carter's Tables, 10. Depth (m-uncorr) - uncorrected water depth. Two additional fields were added to the file: Jday which contains the Julian day and Label which contains an hourly annotation.

    Person who carried out this activity:

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    508-457-2310 (FAX)
    dtwichell@usgs.gov

    Data sources used in this process:
    • FARN85-2.DAT

    Data sources produced in this process:

    • farn85-2_hr.txt

    Date: 02-Aug-2005 (process 2 of 3)
    The comma delimited text file was imported to ArcView (v. 3.3) as a table, and then converted to a shapefile.

    Person who carried out this activity:

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    508-457-2310 (FAX)
    dtwichell@usgs.gov

    Data sources used in this process:
    • farn85-2_hr.txt

    Data sources produced in this process:

    • farn85-2_hr.shp

    (process 3 of 3)
    The original navigation data were based on the NAD27 datum and they were reprojected to NAD83 using the Project utility in ArcToolbox.

    Person who carried out this activity:

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    508-457-2310 (FAX)
    dtwichell@usgs.gov

    Data sources used in this process:
    • farn85-2_hr.shp

    Data sources produced in this process:

    • farn85-2pnts.shp

  3. What similar or related data should the user be aware of?

    Twichell, D., and Paskevich, V., 1996, GLORIA sidescan sonar field data and navigation data collected in the Gulf of Mexico: Open-File Report 96-707, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Other_Citation_Details: 1 CD-ROM

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

    No additional checks for topological consistency were performed on the data. No duplicate features are present.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

  1. Who distributes the data set? (Distributor 1 of 1)

    David Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2266 (voice)
    (508) 457-2310 (FAX)
    dtwichell@usgs.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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?

  5. What hardware or software do I need in order to use the data set?

    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS® or ArcView® 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of the importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 12-Dec-2005
Metadata author:
U.S. Geological Survey
c/o David Twichell
Oceanographer
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.6 on Mon Dec 12 14:18:07 2005