N80_1NAV.SHP: 15-Minute Navigation for Seismic-Reflection Data Collected in Western Rhode Island Sound

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Frequently-anticipated questions:

What does this data set describe?

Title:
N80_1NAV.SHP: 15-Minute Navigation for Seismic-Reflection Data Collected in Western Rhode Island Sound
Abstract:
During 1980, a seismic-reflection survey utilizing Uniboom seismics was conducted by the U.S. Geological Survey (USGS) in western Rhode Island Sound aboard the Research Vessel Neecho. This cruise consisted of 2 legs totalling 8 survey days. Data from this survey were recorded in analog form and archived at the USGS. As a result of 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, N80_1NAV.SHP: 15-Minute Navigation for Seismic-Reflection Data Collected in Western Rhode Island Sound: Open-File Report 2009-1002, 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 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:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -71.569208
    East_Bounding_Coordinate: -71.130113
    North_Bounding_Coordinate: 41.485329
    South_Bounding_Coordinate: 41.191382

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1002/data/nav/n80_1_15minnav/n80_1nav.gif> (GIF)
    Browse image of 15-minute shotpoint navigation from cruise NECH80-1.

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

    Beginning_Date: 09-Jul-1980, 19800929
    Ending_Date: 17-Jul-1980, 19801002
    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 (474)

    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?

    n80_1nav
    Shapefile attribute table (Source: ESRI)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    TD2
    LORAN-C time delay from Carolina Beach, NC (Source: LORAN-C receiver)

    Date_
    Date on which the navigation data were collected (mm/dd/yyyy). (Source: Chief Scientist)

    Range of values
    Minimum:7/9/1980
    Maximum:10/3/1980

    Time
    Local time of navigation fix recorded as hhmm.xxx (Source: Recorded by LORAN-C navigation system and noted in cruise log book.)

    ValueDefinition
    hhmm.xxx where xxx are decimal minutes when recordedHours, minutes, and decimal minutes in EDT

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Latitude
    Latitude coordinate position of navigation fix. (Source: Converted from time delays using LoranGPS)

    Range of values
    Minimum:41.191382
    Maximum:41.485329
    Units:Decimal degrees
    Resolution:0.000001

    Longitude
    Longitude coordinate position of navigation fix. (Source: Converted from time delays using LoranGPS)

    Range of values
    Minimum:-71.130113
    Maximum:-71.569208
    Units:Decimal degrees
    Resolution:0.000001

    Cruise_ID
    Cruise identification (Source: Compiler)

    ValueDefinition
    NECH80-1Cruise ID

    Minutes
    Time in minutes (Source: Compiler)

    ValueDefinition
    mmmm.xxx where xxx are decimal minutes when recordedTime in minutes after midnight EDT calculated by the following calculation: (int ([time value]/100)*60) + [time value] - ((int([time value]/100))*100) where 'Time' attribute is used for the time value.

    TD1
    LORAN-C time delay from Caribou, ME (Source: LORAN-C receiver)

    Line_Origi
    Line name as recorded in the logbook, underscores and any numbers following underscores were added to differentiate line segments collected at different times. (Source: Chief Scientist)

    Comments_O
    Navigation notes made to position fixes in log book, including Start of Line (SOL) and End of Line (EOL). (Source: Seismic log book)

    Line_Split
    Line names based on sections split during data collection or scanning; corresponds to black and white TIFF images. (Source: Complier)

    Comments_S
    Notation for the start and end of line segments (SOL, EOL) based on split lines; corresponds to black and white TIFF images. (Source: Complier)

    Source
    Source of data (Source: Complier)

    ValueDefinition
    logbookData came directly from the cruise logbook
    n80_1_1minnav_sort.shpData came from the 1-minute navigation file n80_1_1minnav_sort.shp

    Entity_and_Attribute_Overview:
    Zeros in the fields TD1, TD2, latitude and longitude occur where data points were imported from the 1-minute navigation shapefile (n80_1_1minnav_sort.shp). These points were not recorded in the logbook, so they do not have values for the time delays or the associated latitudes and longitudes attribute fields.

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 Neecho during a 1980 geophysical cruise in western Rhode Island Sound. 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 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 Neecho, Western Rhode Island Sound (source 1 of 1)
    O'Hara, C., Wood-Needell, S., Jennings, F., and Loud, P., 1980, Cruise Log, R/V Neecho, Western Rhode Island Sound, Cruise NEE-80-1.

    Online Links:

    Type_of_Source_Media: online
    Source_Contribution:
    LORAN-C navigation data were manually recorded during field work in western Rhode Island Sound. This data set contains the latitude and longitude coordinates converted from the LORAN-C time delays.

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

    Date: 2008 (process 1 of 4)
    LORAN-C time delays (chain 9960) from the R/V Neecho Cruise NECH80-1 Geophysics Logbook were converted in a batch to latitude and longitude (WGS84 projection) using LoranGPS 6.2 using the W and Y chains and selecting the output as decimal degrees.

    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:

    Data sources produced in this process:

    • 80016.txt

    Date: 2008 (process 2 of 4)
    Latitudes and longitudes converted by LoranGPS were copied into an Excel file containing additional information (date, time, line number, comments). Lines are named using the following convention: for instance, 2Ac signifies the line 2A, section c. Capitalized letters are part of the original line number, as recorded in the logbook and on the seismic line; lower case letters refer to sections of the line that were split during data collection or during scanning. Added attribute field 'Line_Split', the line identification based on SEG-Y line segments. Added attribute field 'Comments_Split', the notation of start and end of lines. Added attribute field 'Line_Origi', the line identification of lines as recorded in the logbook. Added attribute field 'Comments_O', the notation of start and ends of lines as recorded in the logbook.

    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:
    • 80016.txt

    Data sources produced in this process:

    • 80016timedelays.xls

    Date: 2009 (process 3 of 4)
    Data from the Excel file were added to ArcMap 9.2 (tools, add xy data) and converted to a shapefile (data, export data) and the projection was defined as geographic WGS84. Navigation fixes that were identified as bad due to LORAN-C jumps or inaccuracies in recording were deleted from the data set.

    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:
    • 80016timedelays.xls

    Data sources produced in this process:

    • n80_1nav.shp

    Date: 2009 (process 4 of 4)
    Added attribute field 'Minutes', the time in minutes after midnight, to the 15-minute navigation file using the field calculator in ArcGIS 9.2 to make the following calculation: (int ([time value]/100)*60) + [time value] - ((int([time value]/100))*100) where the attribute 'Time' is used as the time value.

    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) 458-8700 x2277 (voice)
    (508) 457-2310 (FAX)
    kmcmullen@usgs.gov

    Data sources used in this process:
    • n80_1nav.shp

    Data sources produced in this process:

    • n80_1nav.shp

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

    Needell, S.W., O'Hara, C.J., and Knebel, H.J., 1983, Maps showing geology and shallow structure of western Rhode Island Sound, Rhode Island: U.S. Geological Survey Miscellaneous Field Studies Map MF-1537, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

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?

    Navigation from the logbook for one point, recorded at 1040 on line 7a, was deleted due to its erroneous location; however, the location generated in the 1-minute navigation file (n80_1_1minnav_sort.shp) for this time was used in its place. 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: n80_1nav.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: 13-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 Wed May 13 14:04:06 2009