Tracklines of a multibeam survey of the sea floor in the Historic Area Remediation Site in 2000 (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 in the Historic Area Remediation Site in 2000 (polyline shapefile, geographic, WGS 84)
Abstract:
Surveys of the bathymetry and backscatter intensity of the sea floor of the Historic Area Remediation Site (HARS), offshore of New York and New Jersey, were carried out in 1996, 1998, and 2000 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The objective of the multiple echosounder surveys was to map the bathymetry and surficial sediments over time as dredged material was placed in the HARS to remediate contaminated sediments. Maps derived from the multibeam surveys show sea-floor bathymetry, shaded-relief bathymetry, and backscatter intensity (a measure of sea-floor texture and roughness) at a spatial resolution of 3 meters. The area was mapped by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers and with support from the Canadian Hydrographic Service and the University of New Brunswick.
Supplemental_Information:
These tracklines were not included with the original release of the HARS data. Maps and interpretations of these data are available in Butman and others (2002), Butman (2002), and Butman and others (2003) (citations in cross references). Other datasets from the 1996 HARS survey, as well as datasets from surveys of the HARS in 1998 and 2000, may be found in Butman and others (2017) (see larger work citation).
  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 in the Historic Area Remediation Site in 2000 (polyline shapefile, geographic, WGS 84): data release DOI:10.5066/F74B2ZGX, 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 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:
    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 Historic Area Remediation Site in 1996, 1998, and 2000: U.S. Geological Survey data release, https://doi.org/10.5066/F74B2ZGX.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.900110
    East_Bounding_Coordinate: -73.813757
    North_Bounding_Coordinate: 40.438980
    South_Bounding_Coordinate: 40.346093
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58826307e4b0dc04318b6dee/?name=Hars2000Nav_browse.jpg (JPEG)
    Browse graphic of the tracklines of the multibeam survey.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 06-Apr-2000
    Ending_Date: 30-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 (97)
    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?
    Hars2000Nav
    shapefile of tracklines for 2000 multibeam survey of the Historic Area Remediation Site (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
    Trackline number assigned by USGS (Source: USGS)
    Range of values
    Minimum:2000
    Maximum:2183
    Units:line number
    Lon
    Longitude at start of line (Source: USGS)
    Range of values
    Minimum:-73.90005
    Maximum:-73.813912
    Units:decimal degrees
    Lat
    Latitude at start of line (Source: USGS)
    Range of values
    Minimum:40.346093
    Maximum:40.43898
    Units:decimal degrees
    Year
    Year at start of line (Source: USGS)
    Range of values
    Minimum:2000
    Maximum:2000
    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:97
    Maximum:212
    Units:Julian day
    Hour
    Hour at the start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:0
    Maximum:23
    Units:hour
    Min
    Minute at the start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:0
    Maximum:58
    Units:minute
    Sec
    Second at the start of line (in GMT) (Source: USGS)
    Range of values
    Minimum:1.08
    Maximum:56
    Units:second
    Entity_and_Attribute_Overview:
    The navigation polyline shapefile records the trackline followed by the Canadian Coast Guard ship Frederick G. Creed in the 2000 survey of the Historic Area Remediation Site. The attributes are the USGS assigned line number and the latitude, longitude, and time (year, Julian day, hour, minute, second) at start of line. The 2000 HARS survey was assigned a block of line numbers beginning with 2000.
    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
    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 records the trackline followed by the Canadian Coast Guard ship Frederick G. Creed in the 2000 survey of the Historic Area Remediation Site. The tracklines can be used to identify line spacing, trackline orientation, and the location of data collection. The 2000 survey was carried out along tracklines running north-south and spaced about 100 m apart. The attributes record the latitude, longitude, date, and time at the start of each line.

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 multibeam system utilizes 60 electronically-aimed receive beams spaced at intervals of 2.5 degrees that insonify a strip of sea floor up to 7.5 times the water depth. The horizontal resolution of the beam on the sea floor is approximately 10 % of the water depth. Vertical resolution is approximately 1 % of the water depth. Data were collected along tracklines spaced 5-7 times the water depth apart at a speed of 10-14 knots. The HARS was surveyed in a Zamboni pattern (for efficient turns at high speed) with lines running north-south. The Zamboni pattern yields blocks of southward-run lines adjacent to blocks of northward-run lines. The frequency of the sonar was 95 kHz. Sound velocity profiles were obtained and input into the Simrad processing system to correct for refraction. 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 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 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. ASCII navigation data collected by the DGPS receiver was reformatted to CSV (comma separated value) format using the UNIX awk utility. Point spacing along-track is defined by time. Navigation fixes are recorded at a 1-second interval for this trackline file.
    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: 07-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, Danforth, W.W., Knowles, S.C., May, Brian, and Serrett, Laurie, 2002, Seafloor 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, 2002, Mapping the sea floor of the Historic Area Remediation Site (HARS) offshore of New York City: Fact Sheet FS-001-02, 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:

    Butman, Bradford, Alexander, P. Soupy, Harris, C.K., Traykovski, P.A., ten Brink, M.B., Lightsom, F.S., and Martini, M.A., 2003, Oceanographic observations in the Hudson Shelf Valley, December 1999 - April 2000: Data Report: Open-File Report 02-217, 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:


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. To qualitatively assess the horizontal accuracy of the three HARS surveys, the locations of 23 distinct features on the sea floor identified in the 1996, 1998, and 2000 shaded-relief images were compared. Offsets of features in the 1996 survey compared to the 1998 survey were typically 5 m or less, as expected when navigating with DGPS. Offsets of features in the 2000 survey compared to the 1998 survey were 10-20 m and to the north or south, the along-track direction of the survey. For 18 of the 23 features in the 2000 survey, offsets were to the north compared to the 1998 survey when the track in 2000 was to the south, and offsets were to the south compared to the 1998 survey when the track in 2000 was to the north. The offsets of the remaining 5 features, all surveyed on Julian Day 115, were in the direction of the survey track in 2000. The HARS surveys were run in a Zamboni pattern which resulted in blocks of adjacent survey lines running in the same direction; thus consistent offsets appear to shift these blocks north or south depending on the direction the lines were run. The cause of the offsets in the 2000 survey is unknown and no correction has been made for them.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This shapefile contains edited tracklines for the 2000 multibeam survey of the Historic Area Remediation Site. Other datasets from the 2000 HARS survey 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? Hars2000Nav.zip: contains Hars2000Nav.shp and other files associated with a shapefile, browse graphic, and the 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 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 shapefile of navigation is compressed into a zip file (Hars2000Nav.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: 07-Aug-2020
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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