5 minute Navigation fixes for cruise R/V ASTERIAS 81-2 (81_2NAVP)

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Frequently anticipated questions:

What does this data set describe?

Title:
5 minute Navigation fixes for cruise R/V ASTERIAS 81-2 (81_2NAVP)
Abstract:
This GIS layer contains the shiptrack navigation collected aboard the RV ASTERIAS during a 1981 geophysical cruise to Block Island Sound and easternmost Long Island Sound.
Supplemental_Information:
For more information about the field activity associated with this cruise, see https://cmgds.marine.usgs.gov/fan_info.php?fan=1981-032-FA.
  1. How might this data set be cited?
    Paskevich(comp.), Valerie, and Poppe(comp.), Larry, 2002, 5 minute Navigation fixes for cruise R/V ASTERIAS 81-2 (81_2NAVP): U.S. Geological Survey Open-File Report 2002-002, U.S. Geological Survey, Woods Hole Field Center.

    Online Links:

    This is part of the following larger work.

    Paskevich(comp.), Valerie, and Poppe(comp.), Larry, 2002, Geological Framework Data from Long Island Sound, 1981-1990: A Digital Data Release: U.S. Geological Survey Open-File Report 2002-002, U. S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -72.193500
    East_Bounding_Coordinate: -71.493170
    North_Bounding_Coordinate: 41.348500
    South_Bounding_Coordinate: 41.067000
  3. What does it look like?
    https://pubs.usgs.gov/of/2002/0002/htmldocs/images/browse/81_2navp.gif (GIF)
    R/V ASTERIAS cruise 81-2 extent of shapefile containing the navigation positional fixes shown in its spatial reference to Long Island Sound.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 11-Sep-1981
    Ending_Date: 18-Sep-1981
    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 (901)
    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 0.00001. Longitudes are given to the nearest 0.00001. 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 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
  7. How does the data set describe geographic features?
    81_2navp
    shapefile attribute table (Source: ESRI)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI)
    ValueDefinition
    PointESRI point shapefile
    Coordinates defining the features.
    CRUISEID
    Identifier given to cruise during which the navigation data were collected. (Source: USGS)
    ValueDefinition
    AST81-2Identifier assigned for cruise R/V ASTERIAS 81-2
    DATE
    Date which the navigation data was collected. Values are recorded as an ASCII string. (Source: Chief Scientist)Frequency of measurement: As needed
    ValueDefinition
    09/11/81day/month/year
    09/12/81day/month/year
    09/13/81day/month/year
    09/14/81day/month/year
    09/15/81day/month/year
    09/16/81day/month/year
    09/17/81day/month/year
    09/18/81day/month/year
    TIME
    Time of navigation fix recorded as hhmm. Time in hours and minutes in military time (Source: Recorded by Loran-C navigation system and noted in cruise log book.)
    ValueDefinition
    hhmmHour and minutes
    LINE
    Number assigned to the seismic line for which the navigation was collected. (Source: Chief Scientist)
    Range of values
    Minimum:1
    Maximum:31
    Units:integer
    Resolution:1
    LATITUDE
    Latitude coordinate position of navigation fix recorded as signed decimal degrees. (Source: Northstar 6000 Loran-C receiver)
    Range of values
    Minimum:41.06700
    Maximum:41.34850
    Units:Decimal degrees
    Resolution:0.00001
    LONGITUDE
    Longitude coordinate position of navigation fix recorded as signed decimal degrees. (Source: Northstar 6000 Loran-C receiver)
    Range of values
    Minimum:-72.19350
    Maximum:-71.49317
    Units:Decimal degrees
    Resolution:0.00001
    COMMENTS
    Navigation notes made to positional fixes on Loran-C printout. Example of notes include Start of Line (SOL), End of Line (EOL) and navigation course changes. (Source: AST81-2 Loran-C navigation printout) text
    Entity_and_Attribute_Overview:
    This data layer (navigation collected onboard the R/V ASTERIAS cruise 81-2 to BIS and easternmost LIS) provides information location of seismic data used to interpret the geologic framework.
    Entity_and_Attribute_Detail_Citation:
    Geological Framework Data from Long Island Sound, 1981-1990: A Digital Data Release; U.S. Geological Survey Open-File Report 02-002

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Valerie Paskevich(comp.)
    • Larry Poppe(comp.)
  2. Who also contributed to the data set?
    Sally Needell and Ralph Lewis, the chief scientists aboard the cruise; and Valerie Paskevich for completing the Arc processing and creation of the GIS data layer.
  3. To whom should users address questions about the data?
    U. S. Geological Survey
    Attn: Larry Poppe
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@usgs.gov
    Hours_of_Service: 0800-1600

Why was the data set created?

The purpose is to disseminate a digital version of a regional map showing the distribution of sub-bottom seismic profiles (boomer) collected in Block Island Sound and easternmost Long Island Sound. The seismic data collected along these ship tracks can be used to provide useful information about the framework geology in this region.

How was the data set created?

  1. From what previous works were the data drawn?
    Asterias81-2 LORAN-C printouts (source 1 of 1)
    Needel, Sally W., and Lewis, Ralph S., 1984, Geology of Block Island Sound, R.I. and N.Y.: U.S. Geological Survey Miscellaneous Field Studies Map MF-1621, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

    Type_of_Source_Media: paper
    Source_Contribution:
    During field work conducted in Block Island Sound during September 1981 high-resolution seismic-reflection and LORAN-C navigattion data were collected. This data set is the 5-min. navigation from that cruise.
  2. How were the data generated, processed, and modified?
    Date: 15-Nov-2001 (process 1 of 4)
    Five-minute navigation from the original Northstar-6000 printouts generated onboard the Asterias were converted to decimal degrees and entered into a digital file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Larry Poppe
    Geologist
    384 Woods Hole road
    Woods Hole, MA
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@usgs.gov
    Data sources used in this process:
    • Asterias 81-2 LORAN-C printouts
    Data sources produced in this process:
    • a81_2nav.txt
    Date: 17-Dec-2001 (process 2 of 4)
    The text file containing the R/V ASTERIAS 81-2 navigation data were imported into ArcView and converted to a point theme shapefile. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Valerie Paskevich
    Computer Specialist
    384 Woods Hole road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • a81_2nav.txt
    Data sources produced in this process:
    • 81_2navp.dbf
    • 81_2navp.shp
    • 81_2navp.shx
    Date: 19-Jan-2002 (process 3 of 4)
    The ArcView shapefile was plotted. Navigation fixes that were identified as bad due to Loran-C jumps or inaccuracies in recording were deleted from the data set Person who carried out this activity:
    Valerie Paskevich
    U.S. Geological Survey
    Computer Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov
    Data sources used in this process:
    • 81_2navp.shp
    • 81_2navp.dbf
    Data sources produced in this process:
    • 81_2navp.shp
    • 81_2navp.dbf
    Date: 19-Aug-2024 (process 4 of 4)
    The metadata was edited to remove errors as well as update some information. Edits include updating the citation section with the DOI link and modifying the title, added the link to the field activity in the supplmental information section, added the USGS Thesaurus and ISO 19115 Topic Category thesaurus, added keywords section with USGS persistent identifier as theme keyword, added link to cross-reference, used a generic email address in metadata, replaced distribution liability with FSP statement. Other blank fields were deleted. The metadata date (20020418), but not the contact (except email and contact instructions) was updated. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. (20210817). Replaced all links to data using woodshole.er with the appropriate working link. Fixed the browse graphic broken link. (20240819). 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?
    Needel, Sally W., and Lewis, Ralph S., 1984, Geology of Block Island Sound, R.I. and N.Y.: U.S. Geological Survey Miscellaneous Field Studies Map MF-1621, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

    Online Links:

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

  1. How well have the observations been checked?
    All attribute data were recorded by the chief scientist and entered and checked by the compilers in a consistent manner.
  2. How accurate are the geographic locations?
    All navigation was done by Loran C. Typical Loran accuracy for Long Island Sound is about 100 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete information is provided for all navigation lines in the data set. Navigation points are spaced at 5 minute intervals (approx) and at course changes or line events (start/end of line). Continous navigation is not available.
  5. How consistent are the relationships among the observations, including topology?
    No additional checks for topological consistency were performed on this data set.

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 The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
Although this derived data set and its lineage dataset have been used by the 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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U. S. Geological Survey
    Attn: Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@usgs.gov
  2. What's the catalog number I need to order this data set? Long Island Sound: 81_2navp.shp
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The seven ArcView shapefiles (81_2navp.dbf, 81_2navp.shp, 81_2navp.shx, 81_2navp.avl, 81_2navp.sbn, 81_2navp.sbx, 81_2navp.prj) comprising the navigation fixes (point data) for the ASTERIAS 81-2 cruise in Block Island Sound and easternmost Long Island Sound and an ASCII version of the data layer metadata file. in format ArcView shapefile (version 3.2) ESRI shapefile Size: 1
      Network links: https://doi.org/10.3133/ofr022
      https://pubs.usgs.gov/of/2002/0002/data/nav/81_2nav/81_2navp.zip
      Media you can order: DVD (Density 4.7 Gbytes) (format UDF)
      Note: The user must have a system with a DVD drive capable of reading an UDF standard DVD-R disk. To browse the information contained on this disk, the user must also have a current version of WWW browser available. The user must also have the software installed on their computer system capable to unzip the archived file.
      Data format: ASCII (version information unavailable from original metadata) Comma delimited ASCII file with field header record. Size: 1
      Network links: https://doi.org/10.3133/ofr022
      https://pubs.usgs.gov/of/2002/0002/data/nav/81_2nav/a81_2nav.txt
      Media you can order: DVD (Density 4.75 Gigabytes) (format UDF)
      Note: he user must have a system with a DVD drive capable of reading an UDF standard DVD-R disk. To browse the information contained on this disk, the user must also have a current version of WWW browser available.
    • Cost to order the data: none

  5. Is there some other way to get the data?
    None
  6. What hardware or software do I need in order to use the data set?
    The 81_2 navigation overlay is available in an ArcView shapefile format. The user must have ESRI's ArcView 3.0 or greater software to read and process the data file. In lieu of Arcview, the user may utilize another GIS application package capable of importing the data.

Who wrote the metadata?

Dates:
Last modified: 19-Aug-2024
Metadata author:
Valerie Paskevich
U.S. Geological Survey
computer specialist
384 Woods Hole Road
Woods Hole, MA
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2002-002/81_2navp_meta.faq.html>
Generated by mp version 2.9.51 on Mon Sep 16 16:55:18 2024