Tracklines of a multibeam survey of the sea floor of the Atlantic Beach 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 Atlantic Beach artificial reef (polyline shapefile, geographic, WGS 84)
Abstract:
The Atlantic Beach artificial reef, located on the sea floor 3 nautical miles south of Atlantic Beach, New York in about 20 meters water depth, was built to create habitat for marine life. The reef was originally created by placing heavy materials such as tires, automobile bodies and other vehicles, barges, and rock from a dredging project on the sea floor. 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 Atlantic Beach artificial reef. The data from this survey are bathymetry, backscatter intensity, and navigation trackline.
Supplemental_Information:
Other datasets from the 2000 survey of the Atlantic Beach 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?fan=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 Atlantic Beach artificial reef (polyline shapefile, geographic, WGS 84): data release DOI:10.5066/F7J38RFK, 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 Atlantic Beach artificial reef, offshore of New York: data release DOI:10.5066/F7J38RFK, 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 Atlantic Beach artificial reef, offshore of New York: U.S. Geological Survey data release, https://doi.org/10.5066/F7J38RFK.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.743362
    East_Bounding_Coordinate: -73.692773
    North_Bounding_Coordinate: 40.541817
    South_Bounding_Coordinate: 40.523638
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/599f2f05e4b0e5eb065ec7a4?name=abreef_nav_browsegraphic.jpg (JPEG)
    Browse graphic of the tracklines of a multibeam survey of the sea floor of the Atlantic Beach artificial reef.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 20-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 (34)
    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?
    abreef_nav
    Trackline number for multibeam survey (beginning with 2033) (Source: USGS)
    FID
    Internal feature number (Source: Esri) Coordinates defining the features.
    Shape
    Feature geometry (Source: Esri) Coordinates defining the features.
    LineNum
    Trackline number assigned by Canadian Hydrographic Service (Source: USGS)
    Range of values
    Minimum:2033
    Maximum:2066
    Lon
    Longitude in decimal degree (start of line) (Source: USGS)
    Range of values
    Minimum:-73.742457
    Maximum:-73.693155
    Lat
    Latitude in decimal degrees (start of line) (Source: USGS)
    Range of values
    Minimum:40.523887
    Maximum:40.541467
    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 (Source: USGS)
    Range of values
    Minimum:111
    Maximum:111
    Hour
    Hour of the start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:5
    Maximum:12
    Min
    Minute of start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:0
    Maximum:59.0
    Sec
    Second of start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:0.05
    Maximum:59.0
    Entity_and_Attribute_Overview:
    This polyline shapefile shows the tracklines for the multibeam survey of the sea floor of the Atlantic Beach 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 Atlantic Beach 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 east-west parallel to the local bathymetry.

How was the data set created?

  1. From what previous works were the data drawn?
    raw multibeam data (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 Atlantic Beach artificial reef area was surveyed in a Zamboni pattern (for efficient turns at high speed) with lines running east-west. The Zamboni pattern yields blocks of eastward-run lines adjacent to blocks of westward-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, and to produce images. 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 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 York State Department of Environmental Conservation, Unknown, Artificial reef locations.

    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 tracklines from the multibeam survey of the Atlantic Beach artificial reef are included in the navigation shapefile.
  5. How consistent are the relationships among the observations, including topology?
    All navigation data were processed in the same manner. The Atlantic Beach survey was assigned a block of line numbers by the Canadian Hydrographic Service beginning with 2033. Line 2061 is about 800 m short on the eastern end which results in a strip of no data between adjacent lines 2059 and 2063.

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? abreef_nav.zip: contains the shapefile of trackline navigation (abreef_nav.shp), other shapefile components, browse graphic (abreef_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 Atlantic Beach artificial reef survey is available in a zip file (abreef_nav.zip). To utilize these data, the user must have software capable of uncompressing the WinZip file.

Who wrote the metadata?

Dates:
Last modified: 14-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 x2212 (voice)
bbutman@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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