Tracklines of a multibeam survey of the sea floor of the Hudson Canyon region carried out in 2002 (polyline shapefile, geographic, WGS 84)

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Frequently anticipated questions:

What does this data set describe?

Title:
Tracklines of a multibeam survey of the sea floor of the Hudson Canyon region carried out in 2002 (polyline shapefile, geographic, WGS 84)
Abstract:
The Hudson Canyon begins on the outer continental shelf off the east coast of the United States at about 100-meters (m) water depth and extends offshore southeastward across the continental slope and rise. A multibeam survey was carried out in 2002 to map the bathymetry and backscatter intensity of the sea floor of the Hudson Canyon and adjacent slope and rise. The survey covered an area approximately 205 kilometers (km) in the offshore direction, extending from about 500 m to about 4,000 m water depth, and about 110 km in the alongshore direction, centered on the Hudson Canyon. The sea floor was mapped using a SeaBeam Instruments 2112 multibeam echosounder aboard the National Oceanic and Atmospheric Administration (NOAA) ship Ronald H. Brown. Maps derived from the multibeam observations show sea-floor bathymetry and backscatter intensity (a measure of sea floor texture and roughness), geomorphic provinces, and sea-floor environments (Butman and others, 2006). The sea floor was mapped by the U.S. Geological Survey in cooperation with Rutgers University and with support from NOAA.
Supplemental_Information:
Maps and interpretations of the multibeam echosounder data from the 2002 multibeam survey of the sea floor of the Hudson Canyon region are published in Butman and others (2006) (see cross reference). This publication includes the previously unpublished digital multibeam data and interpretations with FGDC-compliant metadata (CSDGM format). The data were collected on Woods Hole Coastal and Marine Science Center field activity 2002-050-FA (https://cmgds.marine.usgs.gov/fan_info.php?fan=2002-050-FA). Other datasets from the 2002 survey may be found in Butman and others (2017) (see larger work citation). Andrews and others (2013) (see cross reference) present a bathymetric terrain model for the Atlantic margin which includes the Hudson Canyon region.
  1. How might this data set be cited?
    U.S. Geological Survey, 2017, Tracklines of a multibeam survey of the sea floor of the Hudson Canyon region carried out in 2002 (polyline shapefile, geographic, WGS 84): data release DOI:10.5066/F77H1GSF, 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.

    Butman, Bradford, Danforth, William W., Twichell, David C., and Rona, Peter A., 2017, Bathymetry, backscatter intensity, and geomorphology of the sea floor of the Hudson Canyon and adjacent slope and rise: data release DOI:10.5066/F77H1GSF, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Butman, Bradford, Danforth, W.W., Twichell, D.C., and Rona, P.A., 2017, Bathymetry, backscatter intensity, and geomorphology of the sea floor of the Hudson Canyon and adjacent slope and rise: U.S. Geological Survey data release,https://doi.org/10.5066/F77H1GSF.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -72.501745
    East_Bounding_Coordinate: -70.133573
    North_Bounding_Coordinate: 39.838440
    South_Bounding_Coordinate: 37.666833
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58fa5eebe4b0b7ea54525666?name=hc_rb__nav_browsegraphic.jpg (JPEG)
    Browse graphic of the tracklines of a multibeam survey of Hudson Canyon.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 30-Aug-2002
    Ending_Date: 15-Sep-2002
    Ending_Time: unknown
    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):
      • String (377)
    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?
    hc_rb_nav
    Tracklines for 2002 multibeam survey (2002-050-FA) of Hudson Canyon and adjacent slope and rise (Source: USGS)
    FID
    Internal feature number (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry (Source: Esri) Coordinates defining the features.
    LineNumTim
    Month Day Hour Minute at start of line in the format MDDHHMM (Source: USGS)
    Range of values
    Minimum:8301529
    Maximum:9150250
    Lon
    Longitude at start of line (Source: USGS)
    Range of values
    Minimum:-72.492278
    Maximum:-70.186198
    Units:decimal degrees
    Lat
    Latitude at start of line (Source: USGS)
    Range of values
    Minimum:37.678072
    Maximum:39.826835
    Units:decimal degrees
    Year
    Year at start of line (Source: USGS)
    Range of values
    Minimum:2002
    Maximum:2002
    Units:calendar year
    JulianDay
    Julian Day, the integer number representing the interval of time in days since January 1 of the year of collection at start of line (Source: USGS)
    Range of values
    Minimum:242
    Maximum:258
    Units:Julian day
    Hour
    Hour at start of line (Source: USGS)
    Range of values
    Minimum:0
    Maximum:23
    Units:hour
    Min
    Minute at start of line (Source: USGS)
    Range of values
    Minimum:0
    Maximum:59
    Units:minute
    Sec
    Second at start of line (Source: USGS)
    Range of values
    Minimum:0
    Maximum:59.8
    Units:second
    Entity_and_Attribute_Overview:
    This shapefile shows the tracklines for 2002 multibeam survey of the Hudson Canyon by the NOAA ship Ron Brown. Lines were run northeast-southwest, approximately parallel to the topography.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Bradford Butman
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2212 (voice)
    bbutman@usgs.gov

Why was the data set created?

The navigation shapefile shows the track followed by the NOAA ship Ronald H. Brown in the 2002 survey. The tracklines run northeast-southwest, approximately parallel to the slope bathymetry and perpendicular to the canyon axis.

How was the data set created?

  1. From what previous works were the data drawn?
    none (source 1 of 1)
    NOAA, Bolmer, S. Thompson, Robb, James M., and Rona, Peter A., Unpublished Material, raw SeaBeam 2112 multibeam data.

    Type_of_Source_Media: disc
    Source_Contribution:
    A SeaBeam Instruments 2112 multibeam Echo Sounder (12 kHz) was used to acquire the bathymetric data on the NOAA ship Ronald H. Brown. This system utilized up to 151 electronically aimed beams spaced at intervals of 2 degrees that insonify a swath of sea floor up to 3 times the water depth. Over the continental rise, in water depths greater than about 2,000 m, a 5-km track separation was employed, which provided almost 100% overlap of the insonified area from swath to swath. Time considerations compelled less than ideal coverage of the continental slope area, where a track-line separation of about 1.7 km was used, that provided nearly no data overlap between swaths. The survey was conducted at approximately 10 knots (18.5 km/hr). The horizontal resolution of the beam on the sea floor ranged from about 20-65 m in the across-track direction and about 10 m in the along-track direction at 500 m water depth, and from about 100-400 m across-track and 40 m along-track at 3,000 m water depth. Navigation was by GPS. The data were collected on Woods Hole Coastal and Marine Science Center field activity 2002-050-FA (https://cmgds.marine.usgs.gov/fan_info.php?fan=2002-050-FA).
  2. How were the data generated, processed, and modified?
    Date: 2009 (process 1 of 3)
    A suite of processing software (called SwathEd) (Clarke, 1998; see cross reference) developed by the Ocean Mapping Group at the University of New Brunswick, Canada, was used to process, edit, grid, display, and archive the multibeam data. Navigation data were edited on-screen using the SwathEd routine jview to remove undesirable points, including turns at the ends of survey lines. Jview also rejects stray GPS fixes outside of the survey area, as set by the operator (see process steps for bathymetry available from the larger work citation). Person who carried out this activity:
    U.S. Geological Survey
    Attn: William Danforth
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2274 (voice)
    bdanforth@usgs.gov
    Date: 2009 (process 2 of 3)
    1. Reformat ASCII navigation data collected by the DGPS receiver into a CSV formatted ASCII file using the UNIX awk utility.
    2. Import the CSV file as points into ArcGIS using the Import XY data under the tools menu.
    3. Export the point data to a shapefile by right clicking on the point data in the data view window and selecting the Export Data function.
    4. Reformat the point shapefile into a line shapefile using the VAC Extras tool -> FeatConv -> Points to line v2 Person who carried out this activity:
    U.S. Geological Survey
    Attn: William Danforth
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2274 (voice)
    bdanforth@usgs.gov
    Date: 15-Jul-2024 (process 3 of 3)
    Added keywords section with USGS persistent identifier as theme keyword (20200908). Fixed a USGS Thesaurus term (20240715). 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?
    Butman, Bradford, Twichell, D.C., Rona, P.A., Tucholke, B.E., Middleton, T.J., and Robb, J.R., 2006, Sea floor topography and backscatter intensity of the Hudson Canyon region offshore of New York and New Jersey: Open-File Report 2004-1441, U.S. Geological Survey, Reston, VA.

    Online Links:

    Butman, Bradford, Middleton, T.J., Thieler, E.R., and Schwab, W.C., 2003, Topography, shaded relief and backscatter intensity of the Hudson Shelf Valley, offshore of New York: Open-File Report 03-372, U.S. Geological Survey, Reston, VA.

    Online Links:

    Andrews, B.D., Chaytor, J.D., ten Brink, U.S., Brothers, D.S., and Gardner, J.V., 2013, Bathymetric terrain model of the Atlantic margin for marine geological investigations: Open-File Report 2012-1266, U.S. Geological Survey, Reston, VA.

    Online Links:

    Clarke, J.H., 1998, SwathEd: Ocean Mapping Group, University of New Brunswick, New Brunswick, Canada.

    Online Links:

    Butman, Bradford, Danforth, W.W., Clarke, J.E.H., and Signell, R.P., 2017, Bathymetry and backscatter intensity of the sea floor of the Hudson Shelf Valley: data release DOI:10.5066/F7C53J1Z, U.S. Geological Survey, Reston, VA.

    Online Links:

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 navigation was by means of differential GPS and positions are accurate to approximately 10 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Navigation shapefile includes all tracklines in the 2002 Hudson Canyon survey used to create the bathymetric grid and image of backscatter intensity on Woods Hole Coastal and Marine Science Center field activity 2002-050-FA. Other data sets from the survey of the Hudson Canyon may be found in Butman and others (2017) (see larger work citation).
  5. How consistent are the relationships among the observations, including topology?
    All navigation data were processed in the same 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 None
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? hc_rb_nav.zip: contains hc_rb_nav.shp, other shapefile components, and FGDC-compliant metadata (CSDGM format).
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the U.S. Geological Survey, 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 navigation shapefile from the 2002 Hudson Canyon survey is compressed into a zip file (hc_rb_nav.zip). To use these data, the user must have software capable of uncompressing the zip file and ArcGIS or another GIS application package capable of viewing the data.

Who wrote the metadata?

Dates:
Last modified: 15-Jul-2024
Metadata author:
U.S. Geological Survey
Attn: Bradford Butman
Woods Hole Coastal and Marine Science Center
Woods Hole, MA
USA

508-548-8700 x2212 (voice)
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 20240319)
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_F77H1GSF/hc_rb_nav.shp_meta.faq.html>
Generated by mp version 2.9.51 on Tue Jul 16 09:57:54 2024