A75_6LINES2.SHP: Ship Tracklines for Seismic-Reflection Data Collected in Eastern Rhode Island Sound in 1975

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

Frequently-anticipated questions:

What does this data set describe?

Title:
A75_6LINES2.SHP: Ship Tracklines for Seismic-Reflection Data Collected in Eastern Rhode Island Sound in 1975
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_6LINES2.SHP: Ship Tracklines for Seismic-Reflection Data Collected in Eastern Rhode Island Sound in 1975: 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_6lines/a75_6lines2.gif> (GIF)
    Browse image of tracklines 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 (57)

    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_6lines2
    Shapefile attribute table (Source: ESRI)

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

    Range of values
    Minimum:6/20/1975
    Maximum:6/29/1975

    Id
    Internal feature number (Source: ESRI)

    Coordinates defining the features.

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

    Location of the image file

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    CruiseID
    Identification of cruise, ASTR75-June, which indicates R/V Asterias cruise in 1975, during June. (Source: Chief Scientist)

    ValueDefinition
    ASTR75-June 

    LineSeg
    Line segment identification (Source: Compiler)

    ValueDefinition
    Identification of line segment, for instance line 25Ab refers to line 25A, section b (capital letters are part of the line number, lowercase letters indicate the section)

    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 15-minute ship-track navigation collected aboard the R/V Asterias during a 1975 geophysical cruise in eastern Rhode Island Sound. It is a polyline that corresponds to 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?

    Cruise Log, R/V Asterias, SW Buzzards Bay, NE Rhode Island Sound, Vineyard Sound (source 1 of 1)
    U.S. Geological Survey, 1975, Cruise Log, R/V Asterias, SW Buzzards Bay, NE Rhode Island Sound, Vineyard Sound.

    Online Links:

    Type_of_Source_Media: online
    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)
    The 15-minute navigation of individual seismic lines was connected using Points to Line v2 in VACExtras v 2.04 using the attribute "LineSeg" as the unique line identifier. The tool also allows the first occurrence of additional attributes to be brought over to the polyline shapefile. In this case, the attribute "Date" was selected to be included in the output polyline shapefile. These lines correspond to the black and white TIFF images. Lines are named using the following convention: for instance, 25Ab signifies the line 25A, section b. Capitalized letters are part of the original line number, as recorded on the seismic line; lower case letters refer to sections of the line that were split during data collection or scanning.

    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_6nav_sort.shp

    Data sources produced in this process:

    • a75_6lines2.shp

    Date: 2009 (process 2 of 2)
    Deleted line created from null LineSeg points. Added CruiseID and Image attributes in ArcGIS 9.2.

    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_6lines2.shp

    Data sources produced in this process:

    • a75_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 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?

    The logbook navigation for two points in the survey was determined to be incorrect and has been excluded from the data set (line 11b time 1945 and line 14 time 815). 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: a75_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?

    The WinZip 9.0 file contains data are 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 13:43:45 2009