Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise DIAN 97011 Long Island, NY Inner Shelf -- Fire Island, NY, 5-26 May, 1997

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Frequently anticipated questions:

What does this data set describe?

Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise DIAN 97011 Long Island, NY Inner Shelf -- Fire Island, NY, 5-26 May, 1997
This CD-ROM contains digital high resolution seismic reflection data collected during the USGS DIAN 97011 cruise. The coverage is the nearshore of Long Island, NY in the vicinity of Fire Island. The seismic-reflection data are stored as SEG-Y standard format that can be read and manipulated by most seismic-processing software. Much of the information specific to the data are contained in the headers of the SEG-Y format files. The file system format is ISO 9660 which can be read with DOS, Unix, and MAC operating systems with the appropriate CD-ROM driver software installed.
For more information on the field activity associated with these data, see
  1. How might this data set be cited?
    Schwab, Bill, 1997, Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise DIAN 97011 Long Island, NY Inner Shelf -- Fire Island, NY, 5-26 May, 1997: Open-File Report 2000-242, U.S. Geological Survey, Woods Hole, MA.

    Online Links:

    Suggested citation: Hill, J.C., Schwab, W.C., and Foster, D.S., 2000, Archive of Datasonic SIS-1000 chirp subbottom data collected during USGS Cruise DIAN 97011, Long Island, New York, inner shelf; Fire Island, New York, 5-26 May, 1997: U.S. Geological Survey Open-File Report 2000-242,
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.53333
    East_Bounding_Coordinate: -72.81667
    North_Bounding_Coordinate: 40.78333
    South_Bounding_Coordinate: 40.5
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 08-May-1997
    Ending_Date: 26-May-1997
    ground condition
  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?
      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
      UTM_Zone_Number: 18
      Scale_Factor_at_Central_Meridian: .9997
      Longitude_of_Central_Meridian: -75
      Latitude_of_Projection_Origin: 0
      False_Easting: 0
      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 1/298.257222101.
      Altitude_Datum_Name: assumed sea level
      Altitude_Resolution: 1
      Altitude_Distance_Units: two-way travel time
      Altitude_Encoding_Method: Attribute values
      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?
    The data were acquired using a Datasonics SIS 1000 chirp subbottom and sidescan-sonar system. Subbottom data were logged digitally with the ISIS acquisition system. in QMIPS format. SEG-Y data were checked for quality with SIOSEIS seismic processing software and are archived on this CD-ROM. The SEG-Y format is described in detail by Barry and others (1975). The files are in standard 16-bit integer SEG-Y format. The SEG-Y
    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)
    • Schwab, Bill
  2. Who also contributed to the data set?
    Seafloor Mapping Group
  3. To whom should users address questions about the data?
    Schwab, Bill
    U.S. Geological Survey
    Seafloor Mapping Group, Woods Hole Field Center
    U.S. Geological Survey
    Woods Hole Field Center
    384 Woods Hole Road
    Quissett Campus
    Woods Hole, MA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)

Why was the data set created?

In 1995, the USGS Woods Hole Field Center, in Cooperation with the U.S. Army Corps of Engineers, began a program designed to map the seafloor offshore of the New York-New Jersey metropolitan area; the most heavily populated, and one of the most impacted coastal regions of the United States. The ultimate goal of this program is to provide an overall synthesis of the sea floor environment, including surficial sediment texture, subsurface geometry, and anthropogenic impact (e.g. ocean dumping, trawling, channel dredging), through the use and analysis of sidescan-sonar and subbottom mapping techniques. This regional synthesis will support a wide range of management decisions and will provide a basis for further process-oriented investigations.

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: May-1997 (process 1 of 2)
    The subbottom data were recorded on the ISIS data acquisition system in QMIPS format. Chirp subbottom channel extracted from raw QMIPS format sonar files and converted to 16-bit Int. SEG-Y format using the program QMIPSTOSEGY. The fish depth was recorded in two-way time (ms) in the delay field (byte 109) of the SEG-Y trace header. Person who carried out this activity:
    Foster, David S.
    U.S. Geological Survey
    Seafloor Mapping Project
    U.S. Geological Survey
    Woods Hole Field Center
    384 Woods Hole Road
    Quissett Campus
    Woods Hole, MA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
    Date: 16-Aug-2021 (process 2 of 2)
    The metadata from the Open-File report was edited to remove errors as well as update some information. Edits include updating the citation section with the OFR information, added supplemental information with link to the field activity page on CMGDS, change the use and access constraints to none, added the USGS Thesaurus and ISO 19115 Topic Category thesaurus, added keywords section with USGS persistent identifier as theme keyword, fixed information in the NAD83 horizontal coordinate system and the grid system, used a generic email address in metadata, updated digital transfer information, replaced distribution liability with FSP statement. Other blank fields were deleted. The metadata date (19970408), but not the contact (except email) was updated. The metadata available from a harvester may supersede metadata available from the publication. 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)
  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
  4. Where are the gaps in the data? What is missing?
    archive of SEG-Y format seismic data
  5. How consistent are the relationships among the observations, including topology?
    The SEG-Y files were plotted onboard ship using SIOSEIS seismic processing software

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: none
  1. Who distributes the data set? (Distributor 1 of 1)
    Soderberg, Nancy
    U.S. Geological Survey
    Data Library
    U.S. Geological Survey
    Woods Hole Field Center
    384 Woods Hole Road
    Quissett Campus
    Woods Hole, MA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
  2. What's the catalog number I need to order this data set? U.S. Geological Suvey Internal CD-ROM Data Archive
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: SEG-Y
      Network links:
      Media you can order: CD-ROM (format ISO 9660)
      Note: UNIX, DOS, MAC
    • Cost to order the data: none

Who wrote the metadata?

Last modified: 16-Aug-2021
Metadata author:
Foster, David
U.S. Geological Survey
Seafloor Mapping Group
U.S. Geological Survey
Woods Hole Field Center
384 Woods Hole Road
Quissett Campus
Woods Hole, MA

(508) 548-8700 (voice)
(508) 457-2310 (FAX)
The metadata contact email address is a generic address in the event the contact person is no longer with the USGS.
Metadata standard:
FGDC Content Standard (19940608)

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