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  U.S. Geological Survey Open-File Report 02-002

82_3NAVP: 5 Minute Navigation Points for R/V ASTERIAS 82-3 (AST82-3)

Metadata also available as: HTMLTEXT

Frequently-anticipated questions:


What does this data set describe?

    Title:
    82_3NAVP: 5 Minute Navigation Points for R/V ASTERIAS 82-3 (AST82-3)
    Abstract:
    This GIS layer contains the shiptrack navigation points collected aboard the RV ASTERIAS during a 1982 geophysical cruise to eastern Long Island Sound. A boomer seismic system was used to collect the subbottom data.

  1. How should this data set be cited?

    DiGiacomo-Cohen, Mary, 2002, 82_3NAVP: 5 Minute Navigation Points for R/V ASTERIAS 82-3 (AST82-3): 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 02-002, 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: -72.633728
    East_Bounding_Coordinate: -71.614166
    North_Bounding_Coordinate: 41.329872
    South_Bounding_Coordinate: 41.004848

  3. What does it look like?

    ../../../../htmldocs/images/browse/82_3navp.gif (GIF)
    R/V ASTERIAS cruise 82-3 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: 09-Sep-1982
    Ending_Date: 18-Sep-1982
    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 (572)

    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?

    82_3navp
    shapefile attribute table (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Range of values
    Units:Integer
    Resolution:1

    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
    AST82-3Assigned identifier for cruise R/V ASTERIAS 82-3

    LON
    Longitude in decimal degrees of the navigation point. (Source: Chief Scientist)

    Range of values
    Minimum:-72.633728
    Maximum:-71.614167
    Units:Decimal degrees
    Resolution:0.000001

    LAT
    Latitude in decimal degrees of the navigation point. (Source: Chief Scientist)

    Range of values
    Minimum:41.004848
    Maximum:41.329872
    Units:Decimal degrees
    Resolution:0.000001

    LINE
    Number assigned to the seismic line for which the naavigation was collected (Source: Chief Scientist)

    Frequency of measurement: As needed

    Range of values
    Minimum:1
    Maximum:45
    Units:integer
    Resolution:1

    TIME
    Local time at which the navigation was collected. (Source: Cheif Scientists)

    ValueDefinition
    hours and minuteshours and minutes in military time

    Range of values
    Units:Hours and minutes
    Resolution:minutes

    LORANX
    LORAN navigation coordinate collected during cruise (Source: US Coast Guard Loran-C radio navigation system)

    Range of values
    Minimum:26129.4
    Maximum:26420.2
    Units:loran time difference in microseconds
    Resolution:0.1

    LORANY
    LORAN navigation coordinate collected during cruise. (Source: US Coast Guard Loran-C radio navigation system)

    Range of values
    Minimum:43899.1
    Maximum:44019.9
    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

    Range of values
    Units:Months, Days, and Years
    Resolution:Months, Days, and Years

    COMMENT
    Comments on navigational data. Usually the start (SOL) and end (EOL) of seismic lines (Source: Chief Scientist)

    Text

    Range of values
    Units:Not Appilcable
    Resolution:Not Applicable

    Entity_and_Attribute_Overview:
    This datalayer (navigation collected onboard the R/V ASTERIAS cruise 82-3 to BIS and eastern 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)

  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
    c/o Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    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 eastern Long Island Sound aboard the R/V ASTERIAS during 1982. 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 82-3 navigation logs (source 1 of 1)
    Lewis, Ralph, and Needell, Sally, 1987, Maps showing the stratigraphic framework and Quaternary geologic history of eastern Long Island Sound: U.S. Geological Survey Miscellaneous Field Studies Map MF-1939-A.

    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.

    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 eastern Long Island Sound during 1982. This data set is the navigation from that cruise.

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

    Date: 1990 (process 1 of 4)
    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
    c/o Mary DiGiacomo-Cohen
    Long Island Sound Resource Center
    UCONN Avery Point
    1080 Shennecossett Road
    Groton, CT 06340
    USA

    (860) 405-9015 (voice)
    lisrc@uconnvm.uconn.edu

    Data sources used in this process:
    • ASTERIAS 82-3 navigation logs

    Data sources produced in this process:

    • Ast82_3 navigation coverages

    Date: 2001 (process 2 of 4)
    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
    c/o Mary DiGiacomo-Cohen
    Long Island Sound Resource Center
    UCONN Avery Point
    1080 Shennecossett Rd
    Groton, CT 06340
    USA

    (860) 405-9015 (voice)
    lisrc@uconnvm.uconn.edu

    Data sources used in this process:
    • Ast82_3 navigation coverages

    Data sources produced in this process:

    • Ast82_3 navigation shapefiles

    Date: 06-Apr-2002 (process 3 of 4)
    The a82_3p 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 02543-1598
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov

    Data sources used in this process:
    • Ast82_3 navigation shapefiles

    Data sources produced in this process:

    • 82_3navp.dbf
    • 82_3navp.shp
    • 82_3navp.shx
    • 82_3navp.sbn
    • 82_3navp.sbx

    Date: 17-Apr-2002 (process 4 of 4)
    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 02543-1598
    USA

    (508) 548-8700 x2281 (voice)
    (508) 457-2310 (FAX)
    vpaskevich@usgs.gov

    Data sources used in this process:
    • 82_3navp.dbf

    Data sources produced in this process:

    • 82_3navp.dbf


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 with the following excepts - loran numbers are not provided for the points in Block Island Sound, comments are not provided for the points in Long Island Sound. Navigation points are spaced at 5 minute intervals (approx) and at course changes or line events(start/end). Continuous 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
    c/o Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    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: 82_3navp.shp

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?

  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 AST82-3 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: 18-Apr-2002

Metadata author:
Valerie Paskevich
U.S. Geological Survey
computer specialist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2281 (voice)
(508) 457-2310 (FAX)
vpaskevich@usgs.gov

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

Generated by mp version 2.7.3 on Thu Apr 18 07:19:57 2002