Geomorphic provinces in the Hudson Canyon region (polyline shapefile, geographic, WGS 84)

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Frequently anticipated questions:


What does this data set describe?

Title:
Geomorphic provinces in the Hudson Canyon region (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 This publication includes the previously unpublished digital multibeam data and interpretations with FGDC-compliant metadata (CSDGM format).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?
    Twichell, David C., 2017, Geomorphic provinces in the Hudson Canyon region (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, Massachusetts.

    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:DOINumber, 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: -72.521137
    East_Bounding_Coordinate: -70.082809
    North_Bounding_Coordinate: 39.846464
    South_Bounding_Coordinate: 37.615125
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58fa5ed2e4b0b7ea54525658?name=hc_morph_browsegraphic.jpg (JPEG)
    Browse graphic of geomorphic provinces in the Hudson Canyon region.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2006
    Currentness_Reference:
    publication date of original release of maps (with no digital data)
  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):
      • G-polygon (51)
    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_morph
    Geomorphic provinces of the Hudson Canyon and adjacent slope and rise region (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.
    Interp2
    Interpretation of geomorphic provinces of the Hudson Canyon region based on multibeam bathymetry. (Source: USGS)
    ValueDefinition
    slopeThe continental slope occupies the northwest portion of the study area and extends from the shoreward limit of the survey to water depths of 2,000-2,200 m. Areas that are not incised by submarine canyons exhibit slopes that range from 1.8-3 degrees in water depths shallower than 1,300 m and from 2.5-5 degrees in water depths deeper than 1,300 m.
    base of slope depressionsAt the base of the continental slope there are a series of narrow, linear depressions. They are discontinuous, trend parallel to the base of the slope, are 0.5-2 km wide and 3-13 km long, and are as much as 23 m deeper than the surrounding sea floor.
    canyon floorCanyon floors are the relatively flat axial valleys of submarine canyons. Most canyon floors have a comparatively high backscatter intensity on the backscatter image.
    canyon floor-filledShallow valleys located to the northeast of Hudson Canyon that can be traced from the mouths of the canyons at the base on the slope onto the upper rise where they coalesce into one valley that feeds into Hudson Canyon. These shallow valleys and two others on the northeastern side of Hudson Canyon are partially filled with mass-transport deposits.
    canyon wallCanyon walls flank the axial valleys of submarine canyons. Where canyons transect the continental slope the average slope of the walls is about 8 degrees, the walls are eroded, and an intricate network of gullies indicates slope failure.
    upper riseThe upper continental rise lies seaward of the base-of-slope depressions and extends offshore to water depths of 3,000 – 3,100 m. The slope of the upper rise away from submarine canyons ranges from 0.2-0.9 degrees.
    lower riseThe lower continental rise extends from water depths of 3,000-3,100 m to beyond the southeastern edge of the study area. The slope of the lower rise ranges from 0.5-1.2 degrees and, on average, has a slightly greater slope than the upper rise.
    rise valleySeveral linear valleys with bowl-like heads originate on the lower rise in water depths between 3,000 and 3,200 m water depth. The rise valleys are shallow, straight features with bowl-like heads that are 6-69 m deeper than the surrounding sea floor.
    Entity_and_Attribute_Overview:
    This shapefile shows the geomorphic provinces (geomorphology) of the Hudson Canyon and adjacent slope and rise, interpreted using the multibeam bathymetry and backscatter intensity data, and selected high resolution seismic profiles. The morphologic units are: slope, base of slope depressions, canyon floor, canyon floor-filled, canyon wall, upper rise, lower rise, and rise valley. See Butman and others (2006) for description (cross reference).
    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)
    • David C. Twichell
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: David C. Twichell
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 (voice)
    dtwichell@usgs.gov

Why was the data set created?

This shapefile shows an interpretation of geomorphic provinces (slope, base of slope depressions, canyon floor, canyon floor filled, canyon wall, upper rise, lower rise, rise valley) in the Hudson Canyon region based on multibeam bathymetry collected in 2002.

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: 2004 (process 1 of 2)
    Morphology is interpreted using multibeam and high-resolution seismic data (Butman and others, 2006; EEZ-Scan Scientific Staff, 1991). Outlines of each morphologic region were drawn by hand and converted to a shapefile. Person who carried out this activity:
    U.S. Geological Survey
    Attn: David C. Twichell
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2266 (voice)
    dtwichell@usgs.gov
    Date: 2016 (process 2 of 2)
    Data gaps and overlaps between the hand-drawn polygons were removed using the following steps:
    1) Shapefile was imported to a Feature Dataset (UTM 18) within a file geodatabase to build topology. (ArcMap v. 10.3.1) 2) Topology was created for each of the two feature classes (now in the Feature Dataset), with the topology rules "Must not overlap" and "Must not have gaps". Topology was then built and validated to identify those locations. 3) The topology and features were edited to remove/repair these topology errors. 4) Feature classes, were exported from the feature dataset back to shapefile using the geographic coordinate system. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Brian D. Andrews
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    bandrews@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:

    Staff, EEZ-Scan Scientific, 1991, Atlas of the U.S. exclusive economic zone, Atlantic continental margin: Miscellaneous Investigation Series I-2054, U.S. Geological Survey, Reston, VA.

    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?
    Accuracy of hand-drawn interpreted layer estimated to be several pixels (200 - 600 m) depending on water depth).
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Geomorphic features (slope, base of slope depressions, canyon floor, canyon floor fill, canyon wall, upper rise, lower rise, rise valley) in the Hudson Canyon region were identified based on multibeam data from Woods Hole Coastal and Marine Science Center field activity 2002-050-FA (https://cmgds.marine.usgs.gov/fan_info.php?fan=2002-050-FA).
  5. How consistent are the relationships among the observations, including topology?
    Geomorphic features (slope, base of slope depressions, canyon floor, canyon floor fill, canyon wall, upper rise, lower rise, rise valley) in the Hudson Canyon region were identified based on multibeam data from Woods Hole Coastal and Marine Science Center field activity 2002-050-FA. Data gaps and overlaps were identified and corrected.

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? This dataset contains hc_morph.shp as well as the 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 shapefile of morphology is compressed into a zip file (hc_morph.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: 20-Jun-2017
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)
bbutman@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/data_release/DR_F77H1GSF/hc_morph.shp_meta.faq.html>
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