Archive of Water Gun Subbottom Data Collected During USGS Cruise SEAX 95007 New York Bight, 7-25 May, 1995

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Frequently anticipated questions:

What does this data set describe?

Title:
Archive of Water Gun Subbottom Data Collected During USGS Cruise SEAX 95007 New York Bight, 7-25 May, 1995
Abstract:
This DVD-ROM contains copies of the navigation and field water gun subbottom data collected aboard the R/V Seaward Explorer, from 7-25 May, 1995. The coverage is in the New York Bight area. This DVD-ROM (Digital Versatile Disc-Read Only Memory) has been produced in accordance with the UDF (Universal Disc Format) DVD-ROM Standard (ISO 9660 equivalent) and is therefore capable of being read on any computing platform that has appropriate DVD-ROM driver software installed. Access to the data and information contained on this DVD-ROM was developed using the HyperText Markup Language (HTML) utilized by the World Wide Web (WWW) project. Development of the DVD-ROM documentation and user interface in HTML allows a user to access the information by using a variety of WWW information browsers (i.e. NCSA Mosaic, Netscape) to facilitate browsing and locating information and data. To access the information contained on this disk with a WWW client browser, open the file'index.htm' at the top level directory of this DVD-ROM with your selected browser. The HTML documentation is written utilizing some HTML 4.0 enhancements. The disk should be viewable by all WWW browsers but may not properly format on some older WWW browsers. Also, some links to USGS collaborators and other agencies are available on this DVD-ROM. These links are only accessible if access to the Internet is available during browsing of the DVD-ROM. The archived water gun subbottom data are in standard Society of Exploration Geologists (SEG) SEG-Y format (Barry and others, 1975) and may be downloaded for processing with software such as Seismic Unix or SIOSEIS. DOS and Microsoft Windows compatible software for plotting SEG-Y files (PLOTSEIS) and viewing SEG-Y headers (DUMPSEGY) is located in the PLOTSEIS directory. Processed water gun profiles (GIF images) may be viewed on this DVD-ROM with your WWW browser.
Supplemental_Information:
For more information on the seismic surveys see https://cmgds.marine.usgs.gov/fan_info.php?fan=1995-007-FA
These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.
  1. How might this data set be cited?
    Hill, Jenna, 2001, Archive of Water Gun Subbottom Data Collected During USGS Cruise SEAX 95007 New York Bight, 7-25 May, 1995: Open-File Report 2001-157, 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.

    Hill, Jenna C., Schwab, William C., and Foster, David S., 2001, Archive of Water Gun Subbottom Data Collected During USGS Cruise SEAX 95007 New York Bight, 7-25 May, 1995: Open-File Report 2001-157, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.90
    East_Bounding_Coordinate: -73.49
    North_Bounding_Coordinate: 40.58
    South_Bounding_Coordinate: 40.36
  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: 25-May-1995
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Horizontal X and Y UTM coordinates for each shot location are located in the SEG-Y trace headers
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 18
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: .9996
      Longitude_of_Central_Meridian: -75
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 5
      Ordinates (y-coordinates) are specified to the nearest 5
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.
      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 (sea level)
      Depth_Resolution: 1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The data were acquired using a 15 cubic inch water gun seismic profiling system. ITI and Benthos streamers were the receivers. Seismic data were logged digitally with the Masscomp/Xsesimics acquisition system. The SEG-Y data were checked for quality with Seismic Unix seismic processing software and are archived on this DVD-ROM. The SEG-Y format is described in detail by Barry and others (1975). The files are in standard 32-bit IBM floating point SEG-Y format. The SEG-Y files consist of shot files of two traces per shot. Channel one was an ITI streamer and channel 2 when recorded was a Teledyne streamer. There are 2048 samples per trace. The sample rate was 0.5 ms which resulted in a trace length of 1024 ms. The water gun was fired at a rate of 5 seconds.
    Entity_and_Attribute_Detail_Citation:
    Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for digital tape formats, in Digital Tape Standards; Society of Exploration Geophysicists ["Recommended standards for digital tape formats" reprinted from Geophysics, v. 32, p. 1073 - 1084; v. 37, p. 36-44; v. 40, p. 344 - 352.] p. 22 - 30.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Hill, Jenna
  2. Who also contributed to the data set?
    Hill, Jenna C., Schwab, William C., Foster, David S.
  3. To whom should users address questions about the data?
    Schwab, Bill
    U.S. Geological Survey
    Seafloor Mapping Project
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
    bschwab@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 renourishment 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?
  2. How were the data generated, processed, and modified?
    Date: 1995 (process 1 of 6)
    The water gun data was recorded using Xseismics on a MASSCOMP system. Xseismics is a software/hardware package that consisted of Concurrent Computer Corp. Unix based data collection system. This included a 12 bit Analog / Digital converter, an X window display, 8mm tape device, network interface. The software was developed inhouse. This software controlled the data collection system, logged SEGY format seismic data and also displayed seismic data on the X terminal. Person who carried out this activity:
    Foster, David S.
    U.S. Geological Survey
    Seafloor Mapping Project
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
    dfoster@usgs.gov
    Date: 25-Oct-2011 (process 2 of 6)
    Converted the metadata from HTML to a TEXT version using CNS v. 2.8.4 (chew and spit) metadata pre-parser. Once converted used TKME (v 2.8.4) to fix some problems with the metadata. The fixes included: adding ISO keywords, adding a link to the online publication, adding the decimal to the denominator of flattening ratio in the geodetic model. Person who carried out this activity:
    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 24-Jan-2017 (process 3 of 6)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 07-Dec-2017 (process 4 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.). Attempted to modify http to https where appropriate. Added the Larger Work Citation. 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: 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?
    The ship was navigated with differential GPS
  3. How accurate are the heights or depths?
    The vertical position was local sea level and there was no correction to a datum or tides.
  4. Where are the gaps in the data? What is missing?
    All recorded lines are present.
  5. How consistent are the relationships among the observations, including topology?
    This data set is from a single cruise and collection platform, therefore logically consistent.

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 This USGS must be referenced as the originator of the dataset in any future products or research derived from the data.
  1. Who distributes the data set? (Distributor 1 of 1)
    Soderberg, Nancy
    U.S. Geological Survey
    Data Library
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
    nsoderberg@usgs.gov
  2. What's the catalog number I need to order this data set? U.S. Geological Survey Open-file Report 01-157 DVD-ROM
  3. What legal disclaimers am I supposed to read?
    This Digital Versatile Disc-Read Only Memory (DVD-ROM) 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?
    • Availability in digital form:
      Data format: The SEG-Y standard format (Barry and others, 1975) consists of the following: A 3600-byte reel identification header with the first 3200 bytes consisting of a EBCDIC header block and a 400-byte binary header block. Both headers include information specific to line and reel number. The trace data block follows the reel identification header. The first 240 bytes of each trace block is the binary trace identification header. The seismic data samples follow the trace identification header. in format SEG-Y
      Network links: https://woodshole.er.usgs.gov/publications/of01-157/segy/
      https://cmgds.marine.usgs.gov/data/1995_007_FA_w/
      Media you can order: DVD-ROM (format UDF)
      Note: UNIX, DOS, MAC
    • Cost to order the data:

      Available from the Denver Open-File Sales department, price varies. No fee for online downloads.

Who wrote the metadata?

Dates:
Last modified: 18-Mar-2024
Metadata author:
Foster, David S.
U.S. Geological Survey
Seafloor Mapping Group
384 Woods Hole Road
Woods Hole, MA
USA

(508) 548-8700 (voice)
(508) 457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2001-157/of01-157_segy.faq.html>
Generated by mp version 2.9.51 on Mon Mar 25 16:05:19 2024