USGS Seafloor Mapping ALPH 98013 Chirp Subbottom Data offshore of the New York - New Jersey metropolitan area

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Frequently anticipated questions:

What does this data set describe?

Title:
USGS Seafloor Mapping ALPH 98013 Chirp Subbottom Data offshore of the New York - New Jersey metropolitan area
Abstract:
This CD-ROM contains digital high resolution seismic reflection data collected during the USGS ALPH 98013 cruise. 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.
Supplemental_Information:
For more information on the seismic surveys see https://cmgds.marine.usgs.gov/fan_info.php?fan=1998-013-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?
    Schwab, Bill, 1998, USGS Seafloor Mapping ALPH 98013 Chirp Subbottom Data offshore of the New York - New Jersey metropolitan area: Open-File Report 1999-037, 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.

    Foster, David S., Schwab, William C., Danforth, William W., Denny, Jane F., Hill, Jenna, and Irwin, Barry J., 1998, Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise ALPH 98013 New York Bight, 8 September - 23 October, 1998: Open-File Report 1999-037, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 9 CD-ROM set
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -74
    East_Bounding_Coordinate: -73.25
    North_Bounding_Coordinate: 40.5833
    South_Bounding_Coordinate: 40.1666
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 13-Sep-1998
    Beginning_Time: 000000
    Ending_Date: 20-Sep-1998
    Ending_Time: 000000
    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
      This is a Point data set.
    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: .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 1/298257.
      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 Datasonics SIS 1000 chirp subbottom and sidescan sonar fish 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
    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)
    • 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 Project
    U.S. Geological Survey Woods Hole Field Center 384 Woods Hole Road Quissett Campus
    Woods Hole, MA
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
    bschwab@usgs.gov

Why was the data set created?

This project will generate reconnaissance maps of the sea floor 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 surveys will provide an overall synthesis of the sea floor environment, including seabed texture and bed forms, Quaternary strata geometry, and anthropogenic impact (e.g., ocean dumping, trawling, channel dredging). The goal of this project is to survey the offshore area, the harbor, and the southern shore of Long Island, providing a regional synthesis to support a wide range of management decisions and a basis for further process-oriented investigations. The project is conducted cooperatively with the U.S. Army Corps of Engineer (USACE).

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: Sep-1998 (process 1 of 5)
    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 program the 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
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)
    dfoster@usgs.gov
    Date: 24-Jan-2017 (process 2 of 5)
    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: 05-Dec-2017 (process 3 of 5)
    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 distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. 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. Additional edits were probably made to the original metadata by someone else who did not document what they changed. 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-2019 (process 4 of 5)
    Fixed a broken link and added the DOI link. 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 5 of 5)
    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
  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 U.S. Geological Survey Open-File Report
Use_Constraints Public
  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
    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 Suvey Internal CD-ROM Data Archive
  3. What legal disclaimers am I supposed to read?
    This Compact Disc-Read Only Memory (CD-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 CD-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: 18-Mar-2024
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
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:
FGDC Content Standard (19940608)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr1999-037/of99-037.faq.html>
Generated by mp version 2.9.51 on Mon Mar 25 16:05:18 2024