Tracklines of a multibeam survey of the sea floor of the Sandy Hook artificial reef (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 Sandy Hook artificial reef (polyline shapefile, geographic, WGS 84)
Abstract:
The Sandy Hook artificial reef, located on the sea floor offshore of Sandy Hook, New Jersey was built to create habitat for marine life. The reef was created by the placement of heavy materials on the sea floor; ninety-five percent of the material in the Sandy Hook reef is rock. In 2000, the U.S. Geological Survey surveyed the area using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard (CCG) ship Frederick G. Creed. The purpose of this multibeam survey, done in cooperation with the U.S. Army Corps of Engineers when the Creed was in the New York region in April 2000, was to map the bathymetry and backscatter intensity of the sea floor in the area of the Sandy Hook artificial reef. The collected data from this cruise are bathymetry, backscatter intensity, and navigation trackline.
Supplemental_Information:
Other datasets from the 2000 survey of the Sandy Hook artificial reef may be found in Butman and others (2017) (see larger work citation). For more information on the field activity that collected these data, see the field activity page https://cmgds.marine.usgs.gov/fan_info.php?fa=2000-015-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, and U.S. Army corps of Engineers, 2017, Tracklines of a multibeam survey of the sea floor of the Sandy Hook artificial reef (polyline shapefile, geographic, WGS 84): data release DOI:10.5066/F74F1PNH, 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 Sandy Hook artificial reef, offshore of New Jersey: data release DOI:10.5066/F74F1PNH, 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 Sandy Hook artificial reef, offshore of New Jersey: U.S. Geological Survey data release, https://doi.org/10.5066/F74F1PNH.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.949567
    East_Bounding_Coordinate: -73.928245
    North_Bounding_Coordinate: 40.398272
    South_Bounding_Coordinate: 40.338320
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/59b2b9ebe4b020cdf7dc1421?name=shreef_nav_browsegraphic.jpg (JPEG)
    Browse graphic of the tracklines of a multibeam survey of the sea floor Sandy Hook artificial reef.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 23-Apr-2000
    Ending_Date: 24-Apr-2000
    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 (48)
    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?
    shreef_nav
    Tracklines for multibeam survey of Sandy Hook artificial reef (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.
    Id
    Identification number automatically generated by the software that created the shapefile (Source: Esri)
    Range of values
    Minimum:0
    Maximum:0
    LineNum
    Trackline number assigned by the Canadian Hydrographic Service (Source: USGS)
    Range of values
    Minimum:2115
    Maximum:2162
    Lon
    Longitude in decimal degrees (start of line) (Source: USGS)
    Range of values
    Minimum:-73.949355
    Maximum:-73.928323
    Lat
    Latitude in decimal degrees (start of line) (Source: USGS)
    Range of values
    Minimum:40.338337
    Maximum:40.398272
    Year
    Year of data acquisition (Source: USGS)
    Range of values
    Minimum:2000
    Maximum:2000
    JulianDay
    Julian Day, the integer number representing the interval of time in days since January 1 of the year of collection for the start of the line (Source: USGS)
    Range of values
    Minimum:114
    Maximum:115
    Hour
    Hour of start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:0
    Maximum:23
    Min
    Minute of start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:0
    Maximum:56
    Sec
    Second at start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:2.86
    Maximum:59.9
    Entity_and_Attribute_Overview:
    This polyline shapefile shows the tracklines for the multibeam survey of the sea floor of the Sandy Hook artificial reef.
    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
    • U.S. Army corps of Engineers
  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
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x 2212 (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 2000 survey of the Sandy Hook artificial reef. 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 north-south parallel to the local bathymetry.

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 multibeam 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 Sandy Hook artificial reef area was surveyed in a Zamboni pattern (for efficient turns at high speed) with lines running north-south. The Zamboni pattern yields blocks of northward-run lines adjacent to blocks of southward-run lines. 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 2000-015-FA (https://cmgds.marine.usgs.gov/fan_info.php?fa=2000-015-FA).
  2. How were the data generated, processed, and modified?
    Date: 2000 (process 1 of 2)
    A suite of processing software, called SwathEd, developed by the Ocean Mapping Group at the University of New Brunswick, Canada, was used to process and grid 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 in 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: 2009 (process 2 of 2)
    1. Reformat ASCII navigation data collected by the DGPS receiver into an Excel csv formatted ASCII file using the UNIX awk utility. Spacing between points in the trackline is defined by time (1-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 bringing over the first occurrence of line number, longitude, latitude, year, Julian day, hour, minute, and second. 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
  3. What similar or related data should the user be aware of?
    New Jersey Division of Fish and Wildlife, Unknown, Sandy Hook Reef.

    Online Links:

    New Jersey Department of Environmental Protection, Division of Fish and Wildlife, 2017, Artificial Reef Program.

    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?
    These are the Differential Global Positioning System (DGPS) navigation points for the DGPS receiver; they are accurate to +/- 3 meters, horizontally.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All navigation data from the multibeam survey of the Sandy Hook artificial reef are included.
  5. How consistent are the relationships among the observations, including topology?
    All navigation data were processed in the same manner. The Sandy Hook survey was assigned a block of line numbers by the Canadian Hydrographic Service beginning with 2115.

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
    Federal Center
    Denver, CO

    1-888-275-8747 (voice)
  2. What's the catalog number I need to order this data set? shreef_nav.zip: contains the shapefile of trackline navigation (shreef_nav.shp), other shapefile components, browse graphic (shreef_nav_browsegraphic.jpg), and associated 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 U.S. Geological Survey 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 polyline shapefile from the Sandy Hook artificial reef survey is available in a zip file (shreef_nav.zip). To use these data, the user must have software capable of uncompressing the zip file.

Who wrote the metadata?

Dates:
Last modified: 27-Sep-2017
Metadata author:
U.S. Geological Survey
Attn: Bradford Butman
Woods Hole Coastal and Marine Science Center
Woods Hole, MA
USA

508-548-8700 (voice)
bbutman@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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