Trackline navigation for chirp, water-gun, and boomer seismic reflection data collected within the New York Bight by the U.S. Geological Survey (Esri polyline shapefile, Geographic, WGS84)

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Frequently anticipated questions:


What does this data set describe?

Title:
Trackline navigation for chirp, water-gun, and boomer seismic reflection data collected within the New York Bight by the U.S. Geological Survey (Esri polyline shapefile, Geographic, WGS84)
Abstract:
These data represent trackline navigation data seismic-reflection systems utilized during U.S. Geological Survey geophysical research cruises.
  1. How might this data set be cited?
    Denny, Jane F., 2002, Trackline navigation for chirp, water-gun, and boomer seismic reflection data collected within the New York Bight by the U.S. Geological Survey (Esri polyline shapefile, Geographic, WGS84): Open-File Report 2002-152, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Schwab, William C., Denny, Jane F., Foster, David S., Lotto, Linda L., Allison, Mead A., Uchupi, Elazar, Swift, B. Ann, Danforth, William W., Thieler, E. Robert, and Butman, Bradford, 2002, High-Resolution Quaternary seismic stratigraphy of the New York Bight Continental Shelf: Open-File Report 2002-152, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -74.06
    East_Bounding_Coordinate: -71.8000
    North_Bounding_Coordinate: 41.2322
    South_Bounding_Coordinate: 40.15
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 07-May-1995
    Ending_Date: 01-Nov-1998
    Currentness_Reference:
    Publication Date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital vector 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):
      • Complete chain
    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 0.000089992. Longitudes are given to the nearest 0.000089992. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0000000.
      The flattening of the ellipsoid used is 1/298.26.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: Assumed sea level
      Altitude_Resolution: 1
      Altitude_Distance_Units: Two-way travel time
      Altitude_Encoding_Method: Attribute values
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 1
      Depth_Distance_Units: Meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Seismic Systems: Trackline
    Shapefile attribute table (Source: ArcView 3.2)
    Shape
    internal ArcView 3.2 ID (Source: ArcView 3.2) ArcView 3.2
    ID
    ArcView 3.2 internal ID (Source: ArcView 3.2) ArcView 3.2
    Line
    Line Number (Source: SEG-Y header) Line Number
    Cruise
    USGS Cruise ID (Source: USGS Internal ID) Cruise ID Number
    Source
    Seismic Data Source (Source: USGS) Seismic Data Source
    Hotlink
    Internal path designation to a jpg image of the selected line number (Source: Internal ArcView) Hotlink absolute directory path

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jane F. Denny
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Jane F. Denny
    US Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-457-2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

Beginning in 1995, the USGS, in cooperation with the U.S Army Corps of Engineers (USACE), New York District, began a program to generate reconnaissance maps of the sea floor offshore of the New York-New Jersey metropolitan area, one of the most populated coastal regions of the United States. The goal of this mapping program is to provide a regional synthesis of the sea-floor environment, including a description of sedimentary environments, sediment texture, seafloor morphology, and geologic history to aid in understanding the impacts of anthropogenic activities, such as ocean dumping. This mapping effort differs from previous studies of this area by obtaining digital, sidescan sonar images that cover 100 percent of the sea floor. This investigation was motivated by the need to develop an environmentally acceptable solution for the disposal of dredged material from the New York- New Jersey Port, by the need to identify potential sources of sand for nourishment of the southern shore of Long island, and by the opportunity to develop a better understanding of the transport and long-term fate of contaminants by investigations of the present distribution of materials discharged into the New York Bight over the last 100+ years (Schwab and others, 1997).

How was the data set created?

  1. From what previous works were the data drawn?
    OFR 01-97 (source 1 of 5)
    Hill, Jenna C., Schwab, William C., and Foster, David S., 2001, Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise SEAX 95007, New York Bight, 7-25 1995: Open-File Report 01-97, U.S. Geological Survey, Woods Hole, MA.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    This publication contains the raw SEG-Y CHIRP seismic-reflection data stored on DVD-ROM. The navigation used to generate the CHIRP trackline data were stripped from the raw SEG-Y header.
    CHIRP Archive (source 2 of 5)
    Hill, Jenna C., Schwab, W.C., and Foster, D.S., 2001, Archive of Chirp Subbottom Data Collected Druing USGS Cruise SEAX96004 New York Bight, 1 May - 9 June, 1996.: U.S. Geological Survey Open-File Report 01-96, U.S. Geological Survey, Woods Hole, MA.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    This publication contains the raw SEG-Y CHIRP seismic-reflection data stored on DVD-ROM. The navigation used to generate the CHIRP trackline data were stripped from the raw SEG-Y header.
    CHIRP Archive (source 3 of 5)
    Hill, Jenna C., Schwab, W.C., and Foster, D.S., 2001, Archive of Water Gun Subbottom Data Collected Druing USGS Cruise SEAX95007 New York Bight, 7-25 May, 1995: U.S. Geological Survey Open-File Report 01-157, U.S. Geological Survey, Woods Hole, MA.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    This publication contains the raw SEG-Y CHIRP seismic-reflection data stored on DVD-ROM. The navigation used to generate the CHIRP trackline data were stripped from the raw SEG-Y header.
    CHIRP Archive (source 4 of 5)
    Hill, Jenna C., Schwab, W.C., and Foster, D.S., 2001, Archive of Boomer Subbottom Data Collected Druing USGS Cruise SEAX96004 New York Bight, 1 May - 9 June, 1996.: U.S. Geological Survey Open-File Report 00-340, U.S. Geological Survey, Woods Hole, MA.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    This publication contains the raw SEG-Y CHIRP seismic-reflection data stored on DVD-ROM. The navigation used to generate the CHIRP trackline data were stripped from the raw SEG-Y header.
    CHIRP Archive (source 5 of 5)
    Hill, Jenna C., Schwab, W.C., and Foster, D.S., 2001, Archive of Water Gun Subbottom Data Collected Druing USGS Cruise SEAX96004 New York Bight, 1 May - 9 June, 1996.: U.S. Geological Survey Open-File Report 00-396, U.S. Geological Survey, Woods Hole, MA.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    This publication contains the raw SEG-Y CHIRP seismic-reflection data stored on DVD-ROM. The navigation used to generate the CHIRP trackline data were stripped from the raw SEG-Y header.
  2. How were the data generated, processed, and modified?
    Date: 2000 (process 1 of 6)
    The seismic shot navigation is received by the differential GPS system (DGPS), sent directly to the seismic acquisition system, and recorded in the SEG-Y header of each file. The navigation is later extracted from the header, and formatted into a comma-delimited ArcView Ungenerate text format. The file is then imported into ArcView, and a vector line shapefile is generated. The line numbers for each trackline are stored in an ASCII file listing unique track ID and line number. This file is imported into ArcView 3.2 as a table. The file is then joined to the line shapefile by the unique track ID. The table for the trackline file is the editted, a new field created, the line number information written to this new field, the join removed, and the file saved. This permantely saves the line number with the corresponding trackline. Person who carried out this activity:
    Jane F. Denny
    US Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-457-2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
    Date: 20-Nov-2017 (process 2 of 6)
    Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Completely changed the title based on an author (Jane Denny) supplied title. Added online links to the publication and data page in the Identification section. Added the standard order section to the Distribution Information, which included providing a link to download the data. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 30-Jan-2018 (process 3 of 6)
    An error was fixed in one of the originator names. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 4 of 6)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 18-Nov-2019 (process 5 of 6)
    Crossref DOI link was added as the first link in the metadata. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 6 of 6)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
    DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. 99% of the positional data is DGPS. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). Slant-range distance is recorded between the sidescan-sonar tow vehicle and a sidemount rigged with an acoustic transponder during acquisition of CHIRP sub-bottom data. Offset between thesidemount and GPS antennae is measured. Basic trigonomic calculations use the slant-range offset to calculate a 'fish'(tow-vehicle) navigation. An assumption in these calculations is that the tow-vehicle is traveling directly behind the vessel; movement to port or starboard is not accounted for within 'fish' navigation. Thus, the horizontal accuarcy of the CHIRP tow-vehicle is +/- 15 meters. The horizontal positioning for boomer, sparker, and water gun seismic systems did not account for source and receiver offsets and offset the GPS antennae and the source and streamer. It is estimated that these offsets could lead to inaccuracies of about 30 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    These navigation data have been stripped from the header of seismic SEG-Y data. They have been quality checked by comparing these data to navigation data acquired during cruise operations.

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 publications.
  1. Who distributes the data set? (Distributor 1 of 1)
    Jane F. Denny
    US Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-457-2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    This publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on this DVD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA
USA

508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2002-152/TRACKS_meta.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:17 2021