Navigation Points for R/V ASTERIAS 83-2 (AST83-2) (83_2NAVP)

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Frequently anticipated questions:

What does this data set describe?

Title: Navigation Points for R/V ASTERIAS 83-2 (AST83-2) (83_2NAVP)
Abstract:
This GIS layer contains the shiptrack navigation points collected aboard the RV ASTERIAS during a 1983 geophysical cruise to east-central Long Island Sound. A boomer seismic system was used to collect the subbottom data.
Supplemental_Information:
For more information about the field activity associated with this cruise, see https://cmgds.marine.usgs.gov/fan_info.php?fan=1983-002-FA.
  1. How might this data set be cited?
    DiGiacomo-Cohen, Mary, 2002, Navigation Points for R/V ASTERIAS 83-2 (AST83-2) (83_2NAVP): U.S. Geological Survey Open-File Report 2002-002, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Poppe, Larry, and Paskevich, Valerie, 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: -72.950035
    East_Bounding_Coordinate: -72.560265
    North_Bounding_Coordinate: 41.245796
    South_Bounding_Coordinate: 40.972534
  3. What does it look like?
    https://pubs.usgs.gov/of/2002/0002/htmldocs/images/browse/83_2navp.gif (GIF)
    R/V ASTERIAS cruise 83-2 extent of navigation lines shapefile shown in its spatial reference to Long Island Sound.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 25-May-1983
    Ending_Date: 03-Jun-1983
    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 (902)
    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 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
  7. How does the data set describe geographic features?
    83_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
    AST83-2Identifier assigned to cruise R/V ASTERIAS 83-2
    LON
    Longitude in decimal degrees of the navigation point. (Source: Chief Scientist)
    Range of values
    Minimum:-072.950035
    Maximum:-072.560265
    Units:Decimal degrees
    Resolution:0.000001
    LAT
    Latitude in decimal degrees of the navigation point. (Source: Chief Scientist)
    Range of values
    Minimum:40.972534
    Maximum:41.245796
    Units:Decimal degrees
    Resolution:0.000001
    LINE
    Number assigned to the seismic line for which the navigation was collected (Source: Chief Scientist)Frequency of measurement: As needed
    Range of values
    Minimum:1
    Maximum:25
    Units:lines
    TIME
    Local time at which the navigation was collected. (Source: Cheif Scientists)
    ValueDefinition
    hours and minuteshours and minutes in military time
    LORANX
    LORAN navigation coordinate collected during cruise (Source: US Coast Guard Loran-C radionavigation system)
    Range of values
    Minimum:26379.9
    Maximum:26570.2
    Units:loran time difference in microseconds
    Resolution:0.1
    LORANY
    LORAN navigation coordinate collected during cruise (Source: US Coast Guard Loran-C radionavigation system)
    Range of values
    Minimum:43897.7
    Maximum:44039.7
    Units:loran time difference in microseconds
    Resolution:0.1
    DATE
    Date during which the navigation data was collected. (Source: Chief Scientist)
    ValueDefinition
    MONTH/DAY/YEARMonths, Days, and Years
    Entity_and_Attribute_Overview:
    This datalayer (navigation collected onboard the R/V ASTERIAS cruise 83-2 to east-central LIS) provides information about the 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 release

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Mary DiGiacomo-Cohen
  2. Who also contributed to the data set?
    Ralph Lewis and Sally Needell, the chief scientists aboard the cruise; Mary DiGiacomo-Cohen 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
    Geologist
    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 east-central Long Island Sound aboard the R/V ASTERIAS during 1983. 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?
    ASTERIAS 83-2 navigation logs (source 1 of 1)
    Lewis, Ralph S., Needell, Sally W., and Colman, Steven M., 1987, Maps showing the Quaternary geology of east-central Long Island Sound: U.S. Geological Survey Miscellaneous Field Studies Map MF-1939-B, U.S. Geological Survey, Reston, VA.

    Online Links:

    This is part of the following larger work.

    Lewis, Ralph S., and DiGiacomo-Cohen, Mary, 2000, A review of the Geological Framework of the Long Island Sound basin, with some observations relating to postglacial sedimentation: Journal of Coastal Research vol. 16, no. 3, Coastal Education and Research Foundation, Fort Lauderdale, FL.

    Online Links:

    Type_of_Source_Media:
    High-resolution seismic-reflection boomer lines navigated with Loran C
    Source_Scale_Denominator: 80,000
    Source_Contribution:
    High-resolution seismic-reflection data were collected during field work conducted in east-central Long Island Sound during 1983. This data set is the navigation from that cruise.
  2. How were the data generated, processed, and modified?
    Date: 1990 (process 1 of 5)
    Selected navigation points from the original onboard logs were hand plotted on charts with Loran overlays. These overlays were then registered and digitized (using a Calcomp 9100 table and PC Arc/Info) to create point coverages with CT state plane coordinates. Attributes were added. Person who carried out this activity:
    Connecticut DEP
    Attn: Mary DiGiacomo-Cohen
    Long Island Sound Resource Center
    UCONN Avery Point
    1080 Shennecossett Road
    Groton, CT
    USA

    (860) 405-9015 (voice)
    lisrc@uconnvm.uconn.edu
    Data sources used in this process:
    • ASTERIAS 83-2 navigation logs
    Data sources produced in this process:
    • Ast83_2 navigation coverages
    Date: 2001 (process 2 of 5)
    The navigation coverage was projected to Latitude/Longitude using Arc/Info. Decimal degree coordinates were ungenerated and joined to the attribute table. A shapefile was generated using ArcView. Person who carried out this activity:
    Connecticut DEP
    Attn: Mary DiGiacomo-Cohen
    Long Island Sound Resource Center
    UCONN Avery Point
    1080 Shennecossett Rd
    Groton, CT
    USA

    (860) 405-9015 (voice)
    lisrc@uconnvm.uconn.edu
    Data sources used in this process:
    • Ast83_2 navigation coverages
    Data sources produced in this process:
    • Ast83_2 navigation shapefiles
    Date: 06-Apr-2002 (process 3 of 5)
    The a83_2p shapefile name was changed to be more descriptive within the USGS Open-File Report 02-002. 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:
    • Ast83_2 navigation shapefiles
    Data sources produced in this process:
    • 83_2navp.dbf
    • 83_2navp.shp
    • 83_2navp.shx
    • 83_2navp.sbn
    • 83_2navp.sbx
    Date: 17-Apr-2002 (process 4 of 5)
    Navigation shapefiles were modified to delete the Arc/Info generated attribute fields. 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:
    • 83_2navp.dbf
    Data sources produced in this process:
    • 83_2navp.dbf
    Date: 19-Aug-2024 (process 5 of 5)
    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?
    Needell, Sally W., Lewis, Ralph S., and Colman, Steven M., 1987, Maps showing the Quaternary geology of east-central Long Island Sound: U.S. Geological Survey Miscellaneous Field Study MF-1939-B, U.S. Geological Survey, Woods Hole Field Center.

    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 LIS 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 points in the data set. Navigation points are spaced at 5 minute intervals (approx) and at course changes or line events (start/end). 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: 83_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 (83_2navp.dbf, 83_2navp.shp, 83_2navp.shx, 83_2navp.avl, 83_2navp.sbn, 83_2navp.sbx) comprising the navigation point data for the R/V ASTERIAS 83_2 cruise in east-central Long Island Sound and an ASCII version of the metadata file. in format ArcView (version 3.2) ESRI point shapefile Size: 1
      Network links: https://doi.org/10.3133/ofr022
      https://pubs.usgs.gov/of/2002/0002/data/nav/83_2nav/83_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.
    • Cost to order the data: none

    • Availability in digital form:
      Data format: ASCII (version information unavailable from original metadata) Comma delimited ASCII text file with field header record. Size: 40.9
      Network links: https://doi.org/10.3133/ofr022
      https://pubs.usgs.gov/of/2002/0002/data/nav/83_2nav/a83_2nav.txt
      Media you can order: CD-ROM (Density 4.75 Gigabytes) (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.
    • 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 AST83-2 point 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/ofr2002-002/83_2navp_meta.faq.html>
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