A75_6_SEGYLINES.SHP: Ship Tracklines of Seismic-Reflection Data Collected in Eastern Rhode Island Sound in 1975; Lines Correspond to SEG-Y Files

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

Frequently-anticipated questions:

What does this data set describe?

Title:
A75_6_SEGYLINES.SHP: Ship Tracklines of Seismic-Reflection Data Collected in Eastern Rhode Island Sound in 1975; Lines Correspond to SEG-Y Files
Abstract:
During 1975, the U.S. Geological Survey (USGS) conducted a seismic-reflection survey utilizing Uniboom seismics in eastern Rhode Island Sound aboard the Research Vessel Asterias. This cruise totalled 8 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, A75_6_SEGYLINES.SHP: Ship Tracklines of Seismic-Reflection Data Collected in Eastern Rhode Island Sound in 1975; Lines Correspond to SEG-Y Files: 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: -71.215370
    East_Bounding_Coordinate: -70.637272
    North_Bounding_Coordinate: 41.502251
    South_Bounding_Coordinate: 41.233566

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1003/data/nav/eris/a75_6_segylines/a75_6_segylines.gif> (GIF)
    Browse image of 1-minute shot point navigation from cruise ASTR75-June.

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

    Beginning_Date: 20-Jun-1975
    Ending_Date: 29-Jun-1975
    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 (65)

    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?

    a75_6_segylines
    Shapefile attribute table (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Id
    Internal Feature Number (Source: ESRI)

    ValueDefinition
    ESRI

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    LineSeg
    Line identification in the format 25Ab_1, where 25A is the line number and b is the section of the paper record, and _1 is the split of the SEG-Y record (due to belt changes). (Source: Compiler)

    LineID
    cruise and line identification (Source: Complier)

    ValueDefinition
    Identification of cruise and line in the format a75_625Ab_1, where a75_6 signifies the cruise on the R/V Asterias in 1975, during June (6); line 25A, section b, SEG-Y segment _1 (when split because of belt changes).

    Date_
    Date on which line data was acquired (Source: Logbook)

    ValueDefinition
    Dates are in the following format: m-dd-yyyy

    Image
    Location of PNG image of line, which is a compressed file of the TIFF image used to make the SEG-Y line. (Source: Compiler)

    Entity_and_Attribute_Overview:
    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 the ship-track navigation collected aboard the R/V Asterias during a 1975 geophysical cruise in eastern Rhode Island Sound. It contains navigation for the SEG-Y files created from analog records of data collected on the cruise. 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. This data combined with the shot point navigation shapefile can be used to spatially correlate the SEG-Y and PNG files with other features in the GIS.

How was the data set created?

  1. From what previous works were the data drawn?

    Cruise Log, R/V Asterias, SW Buzzards Bay, NE Rhode Island Sound, Vineyard Sound (source 1 of 1)
    U.S. Geological Survey, 1980, Cruise Log, R/V Asterias, SW Buzzards Bay, NE Rhode Island Sound, Vineyard Sound.

    Online Links:

    Type_of_Source_Media: log book
    Source_Contribution:
    LORAN-C navigation data were recorded during field work in eastern Rhode Island Sound. This data set contains the latitude and longitude coordinates converted from the LORAN-C time delays described in the a75_6nav_sort.shp metadata (<https://pubs.usgs.gov/of/2009/1003/data/nav/eris/a75_6nav/a75_6nav.zip>).

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

    Date: 2009 (process 1 of 2)
    Used VAC Extras (v. 2.04) Points to Line v2 tool to create lines of the 1-minute navigation point shapefile that corresponds to the SEG-Y lines. The attribute "LineSeg" was used as the unique line identifier. Additionally, the tool allowed the attribute "LineID" to be brought over to the polyline shapefile.

    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:
    • a75_6_1minnav_sort.shp

    Data sources produced in this process:

    • a75_6_segylines.shp

    Date: 2009 (process 2 of 2)
    Added attribute fields 'Image', location of PNG file associated with the line and 'Date_', the date on which the seismic data of each line was obtained.

    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:
    • a75_6_segylines.shp

    Data sources produced in this process:

    • a75_6_segylines.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 9930 U.S. East Coast chain and recorded time delays from Cape Race, Newfoundland (X) and Dana, Ind. (Z) 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 and correspond to digitized SEG-Y files. Navigation points are spaced at 1-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: a75_6_segylines.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?

    The WinZip 9.0 file contains data available in Environmental Systems Research Institute (ESRI) shapefile format. The user must be able to uncompress the zip file and 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.

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 13:38:28 2009