Tracklines of a multibeam survey of the Hudson Shelf Valley carried out in 1998 (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 Hudson Shelf Valley carried out in 1998 (polyline shapefile, geographic, WGS 84)
Abstract:
The Hudson Shelf Valley is the submerged seaward extension of the ancestral Hudson River drainage system and is the largest physiographic feature on the Middle Atlantic continental shelf. The valley begins offshore of New York and New Jersey at about 30-meter (m) water depth, runs southerly and then southeasterly across the Continental Shelf, and terminates on the outer shelf at about 85-m water depth landward of the head of the Hudson Canyon. Portions of the 150-kilometer-long valley were surveyed in 1996, 1998, and 2000 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The purpose of the multibeam echosounder surveys was to map the bathymetry and backscatter intensity of the sea floor of the valley, providing a framework for geologic, oceanographic, and geochemical studies. The data from the three surveys are combined to produce grids of bathymetry and backscatter intensity at 12-m resolution that cover the entire valley and the head of the Hudson Canyon. The mapping was done by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers with support from the Canadian Hydrographic Service and the University of New Brunswick.
Supplemental_Information:
Butman and others (1998), Butman and others (2003), and Thieler and others (2007) (see cross references) present maps and interpretations of the multibeam data. Other datasets from the survey of the Hudson Shelf Valley may be found in Butman and others (2017) (see larger work citation).
  1. How might this data set be cited?
    U.S. Geological Survey, 2017, Tracklines of a multibeam survey of the Hudson Shelf Valley carried out in 1998 (polyline shapefile, geographic, WGS 84): data release DOI:10.5066/F7C53J1Z, 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., John E. Hughes Clarke, and Signell, Richard 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:

    Other_Citation_Details:
    Suggested citation: 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: U.S. Geological Survey data release, https://doi.org/10.5066/F7C53J1Z.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.826718
    East_Bounding_Coordinate: -72.890948
    North_Bounding_Coordinate: 40.358015
    South_Bounding_Coordinate: 39.712845
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/589a1fb1e4b0efcedb71a595?name=hsv_1998_nav_browsegraphic.jpg (JPEG)
    Browse graphic of the tracklines of the 1998 multibeam survey.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 29-Oct-1998
    Ending_Date: 02-Nov-1998
    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 (118)
    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?
    hsv_1998_nav
    Tracklines for 1998 multibeam survey (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.
    LineNum
    CHS-assigned line number (Source: USGS)
    Range of values
    Minimum:341
    Maximum:722
    Units:line number
    Lon
    Longitude in decimal degrees at start of line (Source: USGS)
    Range of values
    Minimum:-73.826718
    Maximum:-72.890948
    Units:decimal degrees
    Lat
    Latitude in decimal degrees at start of line (Source: USGS)
    Range of values
    Minimum:39.712962
    Maximum:40.358015
    Units:decimal degrees
    Year
    Calendar year data were collected (Source: USGS)
    Range of values
    Minimum:1998
    Maximum:1998
    Units:calendar year
    JulianDay
    Julian Day, the integer number representing the interval of time in days since January 1 of the year of collection (Source: USGS)
    Range of values
    Minimum:302
    Maximum:306
    Units:Julian day
    Hour
    Hour at start of line (Source: USGS)
    Range of values
    Minimum:0
    Maximum:23
    Units:hours
    Min
    Minute at start of line (Source: USGS)
    Range of values
    Minimum:0
    Maximum:59
    Units:minutes
    Sec
    Second at start of line (Source: USGS)
    Range of values
    Minimum:0.7
    Maximum:59.7
    Units:seconds
    Entity_and_Attribute_Overview:
    The navigation polyline shapefile shows the track followed by the Canadian Coast Guard ship Frederick G. Creed in the 1998 survey of the Hudson Shelf Valley. The attributes are the Canadian Hydrographic Service assigned line number and the latitude, longitude, and time (year, Julian day, hour, minute, second) at start of line. The valley was surveyed in sections. Blocks of line numbers, in increments of 100, were assigned for each section.
    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 polyline shapefile shows the track followed by the Canadian Coast Guard ship Frederick G. Creed in the 1998 survey of the Hudson Shelf Valley. The shapefile can be used to identify line spacing, trackline orientation, and the location of data collection. The attributes record the latitude, longitude, date, and time at the start of each line. The tracklines run approximately parallel to the axis of the valley.

How was the data set created?

  1. From what previous works were the data drawn?
    none (source 1 of 1)
    Service, Canadian Hydrographic, Danforth, William W., and John E. Hughes Clarke, Unpublished Material, raw navigation data.

    Type_of_Source_Media: disc
    Source_Contribution:
    The multibeam data were collected with a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The valley was surveyed with lines running approximately parallel to the valley axis; in some areas the lines were run in a Zamboni pattern for efficiency. The piecemeal survey pattern was a result of the limited endurance of the Creed, about 2 days, and weather. The frequency of the sonar is 95 kHz. Navigation was by means of differential GPS. Operation of the Simrad EM1000 was carried out by hydrographers of the Canadian Hydrographic Service. The data were collected on Woods Hole Coastal and Marine Science Center field activity 1998-015-FA (https://cmgds.marine.usgs.gov/fan_info.php?fa=1998-015-FA).
  2. How were the data generated, processed, and modified?
    Date: 1998 (process 1 of 4)
    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 the multibeam and navigation 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 in link for larger work citation). Person who carried out this activity:
    U.S. Geological Survey
    Attn: William W. Danforth
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2274 (voice)
    bdanforth@usgs.gov
    Date: 2010 (process 2 of 4)
    1. Reformat ASCII navigation data collected by the DGPS receiver into a CSV (comma separated value) formatted ASCII file using the UNIX awk utility. Spacing between points in the trackline is defined by time (10-second intervals).
    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 W. Danforth
    Woods Hole Coastal and Marine Science Center
    Woods Hole, MA
    USA

    508-548-8700 x2274 (voice)
    bdanforth@usgs.gov
    Date: 20-Jul-2018 (process 3 of 4)
    USGS Thesaurus keywords added to the keyword section. 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: 10-Aug-2020 (process 4 of 4)
    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?
    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:

    Thieler, E.R., Butman, Bradford, Schwab, W.C., Allison, M.A., Driscoll, N.W., Donnelly, J.P., and Uchupi, Elazar, 2007, A catastrophic meltwater flood event and the formation of the Hudson Shelf Valley: Palaeogeography, Palaeoclimatology, Palaeoecology 246 (2007), 120-136; DOI: 10.1016/j.palaeo.2006.10.030, Elsevier Ltd., Amsterdam.

    Online Links:

    Butman, Bradford, Danforth, W.W., Schwab, W.C., and ten Brink, M.B., 1998, Multibeam bathymetric and backscatter maps of the upper Hudson Shelf Valley and adjacent shelf, offshore of New York: Open-File Report 98-616, U.S. Geological Survey, Reston, VA.

    Online Links:

    Butman, Bradford, Danforth, W.W., Knowles, S.C., May, Brian, and Serrett, Laurie, 2002, Sea floor topography and backscatter intensity of the Historic Area Remediation Site (HARS), offshore of New York, based on multibeam surveys conducted in 1996, 1998, and 2000: Open-File Report 00-503, U.S. Geological Survey, Reston, VA.

    Online Links:

    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:

    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 Historic Area Remediation Site in 1996, 1998, and 2000: data release DOI:10.5066/F74B2ZGX, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    This publication contains edition 2.0 of the bathymetry and derivative datasets that were originally released as part of Open-File Report 00-503. Edition 2.0 was created using revised processing software to correct a projection error in edition 1.0. The stretch for the images in edition 2.0 was also changed so that 255 is no data.

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?
    These data were navigated with a Differential Global Positioning System (DGPS) which is typically accurate to +/- 3 meters, horizontally. Repeated surveys of the Historic Area Remediation Site (HARS) (Butman and others, 2017), made on the same cruises and using the same instrumentation as the surveys of the Hudson Shelf Valley, were used to qualitatively assess the horizontal accuracy of the 1996, 1998, and 2000 surveys. The difference in location of sea floor features in the HARS identified in the 1996 and 1998 surveys were typically 5 m or less, as expected when navigating with DGPS. The difference in location of same features in the 1998 and 2000 survey were typically 10-20 m and in the along-track direction of the survey. This analysis suggests that the data collected in 1996 and 1998 surveys of the Hudson Shelf Valley are accurate to +/- 3 m horizontally, and the data collected in the 2000 survey accurate to 10-20 m horizontally.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Shapefile includes all tracklines in the Hudson Shelf Valley surveyed in 1998. Other datasets from the survey of the Hudson Shelf Valley 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. The valley was surveyed in sections. Blocks of line numbers, in increments of 100, were assigned for each section.

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? hsv_1998_nav.zip: contains hsv_1998_nav.shp (and other files associated with a shapefile), hsv_1998_nav_browsegraphic.jpg browse graphic, and CSDGM FGDC-compliant metadata in XML, HTML, and TXT formats.
  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 the U.S. Army Corps of Engineers, 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 1998 Hudson Shelf Valley survey is compressed into a zip file (hsv_1998_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: 19-Mar-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_F7C53J1Z/hsv_1998_nav.shp_meta.faq.html>
Generated by mp version 2.9.51 on Wed Jun 26 15:25:02 2024