A80_6LINES2.SHP: Ship Tracklines for Seismic-Reflection Data Collected in Southern Rhode Island Sound in 1980

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Frequently-anticipated questions:

What does this data set describe?

Title:
A80_6LINES2.SHP: Ship Tracklines for Seismic-Reflection Data Collected in Southern Rhode Island Sound in 1980
Abstract:
During 1980, the U.S. Geological Survey (USGS) conducted a seismic-reflection survey utilizing Uniboom seismics in southern Rhode Island Sound aboard the Research Vessel Asterias. This cruise totalled 3 survey days. Data from this survey were recorded in analog form and archived at the USGS. Due to recent interest in the geology of Rhode Island Sound and in an effort to make the data more readily accessible while preserving the original paper records, the seismic data from this cruise were scanned and converted to TIFF images and SEG-Y data files. Navigation data were converted from LORAN-C time delays to latitudes and longitudes, which are available in ESRI shapefile format and as eastings and northings in space-delimited text format.
  1. How should this data set be cited?

    U.S. Geological Survey, 2009, A80_6LINES2.SHP: Ship Tracklines for Seismic-Reflection Data Collected in Southern Rhode Island Sound in 1980: Open-File Report 2009-1003, 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.

    McMullen, K.Y., Poppe, L.J., and Soderberg, N.K., 2009, Digital Seismic-Reflection Data from Eastern Rhode Island Sound and Vicinity, 1975-1980: Open-File Report 2009-1003, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: 2 DVD-ROMs

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -71.423661
    East_Bounding_Coordinate: -70.424530
    North_Bounding_Coordinate: 41.378131
    South_Bounding_Coordinate: 41.044571

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1003/data/nav/sris/a80_6lines/a80_6lines2.gif> (GIF)
    Browse image of tracklines from cruise AST-80-6B.

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

    Beginning_Date: 10-Jun-1980
    Ending_Date: 12-Jun-1980
    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):

      • String (14)

    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 D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    a80_6lines2
    Shapefile attribute table (Source: ESRI)

    Date_
    Date on which seismic line was run (mm/dd/yyyy) (Source: Log book)

    Range of values
    Minimum:6/10/1980
    Maximum:6/12/1980

    Id
    Internal feature number (Source: ESRI)

    Coordinates defining the features.

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    LineSplit
    Seismic line identification. The line number is used with a lower-case letter to signify sections that were split during data collection or scanning. (Source: compiler)

    ValueDefinition
    seismic line identification 

    CruiseID
    Identification of cruise, AST-80-6B, which indicates R/V Asterias cruise in 1980, cruise 6B. (Source: Chief Scientist)

    ValueDefinition
    AST-80-6B 

    Image
    Location of black and white TIFF image of seismic lines that correspond to the polyline. (Source: Compiler)

    Location of the image file

    Entity_and_Attribute_Overview:
    Image attribute can be hyperlinked as a URL address in ArcMap. This metadata was partially generated by importing an existing metadata file in text format. A known bug in ArcCatalog is that importing metadata can under certain circumstances scramble some attribute tags. All the attributes and their definitions are present, but the order of the attributes in the metadata does not match the order of the attributes in the attribute table.

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?

    Katherine McMullen
    U.S. Geological Survey
    Sediment Lab Technician
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 548-8700 x2277 (voice)
    (508) 457-2310 (FAX)
    kmcmullen@usgs.gov

Why was the data set created?

This GIS layer contains tracklines of the ship-track navigation collected aboard the R/V Asterias during a 1980 geophysical cruise in southern Rhode Island Sound. It is a polyline shapefile that corresponds to a80_6nav_sort.shp and the black and white TIFF images. It is part of a digital version of a regional map showing the distribution of sub-bottom seismic profiles collected in Rhode 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?

    Geophysics Log, Asterias 80-6B, Southern Rhode Island Sound (source 1 of 1)
    O'Hara, C., Eusden, J., and Whitney, A., 1980, Geophysics Log, Asterias 80-6B, Southern Rhode Island Sound.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    LORAN-C navigation data were recorded during field work in southern Rhode Island Sound. This data set used the latitude and longitude coordinates converted from the LORAN-C time delays described in the n80_1nav.shp metadata (<https://pubs.usgs.gov/of/2009/1002/data/nav/n80_1_15minnav/n80_1_15minnav.zip>).

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

    Date: 2009 (process 1 of 1)
    The 15-minute navigation of individual seismic lines was connected using Points to Line v2 in VACExtras v 1.91 using the attribute "LineSeg" as the unique line identifier. These lines correspond to the black and white TIFF images. Lines are named using the following convention: for instance, 7a signifies the line 7, section a. Lower case letters refer to sections of the line that were split during data collection or scanning (if a line was too long to scan all at once).

    Person who carried out this activity:

    Katherine McMullen
    U.S. Geological Survey
    Sediment Lab Technician
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 548-8700 x2277 (voice)
    (508) 457-2310 (FAX)
    kmcmullen@usgs.gov

    Data sources used in this process:
    • a80_6nav_sort.shp

    Data sources produced in this process:

    • a80_6lines2.shp

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

    O'Hara, C.J., and Oldale, R.N., 1980, Maps showing geology and shallow structure of eastern Rhode Island Sound and Vineyard Sound, Massachusetts: Miscellaneous Field Studies Map MF-1186, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    McMullen, K.Y., Poppe, L.J., and Soderberg, N.K., 2009, Digital Seismic-Reflection Data from Western Rhode Island Sound, 1980: Open-File Report 2009-1002, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, 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?

    Attribute data were recorded by the science party 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 and was manually recorded. The cruise used the Group Repetition Interval 9960 Northeast U.S. chain and recorded time delays from Caribou, Maine (W) and Carolina Beach, N.C. (Y) slave transmitters. Absolute accuracy is 185 to 463 m based on <http://www.navcen.uscg.gov/loran/handbook/h-book.htm> (see Chapter III).

  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 approximately 15-minute intervals and at course changes or line events (start/end of line). Continuous navigation is not available.

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

    The layers were edited and processed in a consistent manner.

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 are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of this dataset.

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

    Lawrence Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    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?

    Downloadable Data: a80_6lines2.shp

  3. What legal disclaimers am I supposed to read?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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 importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com. The user must be able to uncompress a WinZip 9.0 file.

Who wrote the metadata?

Dates:
Last modified: 29-May-2009
Metadata author:
U.S. Geological Survey
c/o Katherine McMullen
Sediment Lab Technician
384 Woods Hole Road
Woods Hole, MA 02543
USA

(508) 548-8700 x2277 (voice)
(508) 457-2310 (FAX)
kmcmullen@usgs.gov

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

Generated by mp version 2.8.25 on Fri May 29 13:49:38 2009