Survey tracklines along which backscatter data were collected with a Klein 3000, EdgeTech 4200 sidescan sonar and a SEA Ltd., SWATHplus-H interferometric sonar with in Barnegat Bay, New Jersey by the U.S. Geological Survey in 2011, 2012, and 2013 (Esri polyline shapefile, Geographic, WGS 84).

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Frequently anticipated questions:


What does this data set describe?

Title:
Survey tracklines along which backscatter data were collected with a Klein 3000, EdgeTech 4200 sidescan sonar and a SEA Ltd., SWATHplus-H interferometric sonar with in Barnegat Bay, New Jersey by the U.S. Geological Survey in 2011, 2012, and 2013 (Esri polyline shapefile, Geographic, WGS 84).
Abstract:
Water quality in the Barnegat Bay-Little Egg Harbor estuary along the New Jersey coast is the focus of a multidisciplinary research project begun in 2011 by the U.S. Geological Survey (USGS) in partnership with the New Jersey Department of Environmental Protection. This narrow estuary is the drainage for the Barnegat Watershed and flushed by just three inlets connecting it to the Atlantic Ocean, is experiencing degraded water quality, algal blooms, loss of seagrass, and increases in oxygen -depletion events, seaweed, stinging nettles, and brown tide. The scale of the estuary and the scope of the problems within it necessitate a multidisciplinary approach that includes characterizing its physical characteristics (for example, depth, magnitude and direction of tidal currents, distribution of seafloor and subseafloor sediment) and modeling how the physical characteristics interact to affect the estuary's water quality. Scientists from USGS Coastal and Marine Geology Program offices in Woods Hole, Massachusetts, and St. Petersburg, Florida, began mapping the seafloor of the Barnegat Bay-Little Egg Harbor estuary in November 2011 and completed in September 2013. With funding from the New Jersey Department of Environmental Protection and logistical support from the USGS New Jersey Water Science Center, they collected data with a suite of geophysical tools, including swath bathymetric sonar for measuring seafloor depth, a sidescan sonar for collecting acoustic-backscatter data (which provides information about seafloor texture and sediment type), and a subbottom profiler for imaging sediment layers beneath the floor of the estuary. 2011-041-FA: http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2011-041-FA 2012-003-FA: http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2012-003-FA 2013-014-FA: http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2013-014-FA 2013-030-FA: http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2013-030-FA
  1. How might this data set be cited?
    U.S. Geological Survey, 2015, Survey tracklines along which backscatter data were collected with a Klein 3000, EdgeTech 4200 sidescan sonar and a SEA Ltd., SWATHplus-H interferometric sonar with in Barnegat Bay, New Jersey by the U.S. Geological Survey in 2011, 2012, and 2013 (Esri polyline shapefile, Geographic, WGS 84).: Data Series 937, 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.

    Andrews, Brian D., Miselis, Jennifer L., Danforth, William W., Irwin, Barry J., Worley, Charles R., Bergeron, Emile M., and Blackwood, Dann S., 2015, Marine geophysical data collected in a shallow back-barrier estuary: Barnegat Bay, New Jersey: Data Series 937, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -74.318604
    East_Bounding_Coordinate: -74.049683
    North_Bounding_Coordinate: 40.060978
    South_Bounding_Coordinate: 39.468328
  3. What does it look like?
    BarnBayBSTrks.jpg (JPEG)
    Image of tracklines along which backscatter data were collected within Barnegat Bay, NJ. The file is located in the compressed zip file.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Nov-2011
    Ending_Date: 16-Sep-2013
    Currentness_Reference:
    ground condition of individual surveys during bathymetry collection: 20111101-20111107; 20120321-20120408; 20130313-20130326; 20130911-20130916.
  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 (892)
    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?
    BarnBayBSTrks
    polyline shapefile of backscatter tracklines collected in Barnegat Bay, New Jersey by the USGS. (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.
    LineName
    Name of the survey line and corresponding raw data file that was collected along that line. For example, "L123F2" is survey line (L) 123, File2 (F2) (Source: USGS) unrepresentable domain
    JulDay
    The Julian day the data were collected where Julian day is the integer number representing the interval of time in days since January 1 of the year of collection. (Source: USGS)
    Range of values
    Minimum:72
    Maximum:311
    Units:day
    Resolution:1
    Survey
    The name of the survey during which the line was collected using the Woods Hole Coastal and Marine Science Center Field Activity number.Where the first 4 characters are the year of the survey (2011), followed by the sequential number of the survey (041), followed by "FA" for field activity. (Source: USGS) unrepresentable domain
    Shape_Leng
    The length of each feature in meters calculated using the UTM Zone 18 (WGS 84) coordinate system (Source: USGS)
    Range of values
    Minimum:153.23
    Maximum:7200.92
    Units:meters
    Resolution:0.01
    Sonar
    Type of sonar used to collect backscatter data (Source: USGS) Character set.

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?
    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  3. To whom should users address questions about the data?
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

Why was the data set created?

The purpose of these data are to record and identify the 2,010 kilometers of line files collected by the USGS in Barnegat Bay, New Jersey used to generate the three backscatter mosaics published in this report DS937: BarnBayBS_1m.tif, LittleEggInletBS1m.tif, and BarnBayInletsBS_1m.tif.

How was the data set created?

  1. From what previous works were the data drawn?
    raw xtf and sxr files (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, Raw sidescan backscatter files in xtf, and SWATHplus backscatter files in SXR formats.

    Type_of_Source_Media: disc
    Source_Contribution:
    SONAR CONFIGURATION: TOWED SIDESCAN BACKSCATTER During USGS Survey 2011-041-FA a Klein 3000 sidescan sonar operating at a frequency of 132 and 445 kHz was used. During the remaining two surveys (2012-003-FA, 2013-014-FA), backscatter data were collected using an EdgeTech 4200 operating on a frequency of 100 and 400 kHz. The Klein and EdgeTech sonars were towed from the port side of the R/V Rafael approximately 1.5 m astern. SWATHPLUS BACKSCATTER backscatter data were acquired using Systems Engineering and Assessment Ltd (SEA) SWATHplus-H interferometric sonar operating at a frequency of 468 kHz. The sonar transducers were mounted on a rigid pole installed on the bow of the R/V Rafael.
  2. How were the data generated, processed, and modified?
    Date: Oct-2013 (process 1 of 5)
    Step 1: Towed Sidescan Navigation. Navigation for the Klein 3000 and EdgeTech 4200 sidescan sonars were extracted from the raw files at 30 second intervals and converted to text files for each line using XSonar (v. 2.0) (Danforth 1997). The line files for each Julian day were concatenated together into one comma delimited file (*.csv) with the columns: Lon, Lat, JulianDay, LineName. Navigation was processed during each survey in 2011, 2012, and 2013. Person who carried out this activity:
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Date: Oct-2013 (process 2 of 5)
    Step 2: Convert sidescan navigation points to lines. The navigation file ("JulianDay".csv) for each Julian day was converted to an Esri point shapefile ("JulianDay".shp) using the context menu in ArcCatalog (v. 9.3.1) "Create Feature Class from XY Table". The point shapefile for each Julian day was then converted to a polyline shapefile using "Points to Line v.2" with "VAC Extras" toolbar created by VeeAnn Cross (USGS) During this conversion "LineName" and "JulianDay" attributes were carried over so that the each line in the polyline shapefile (JulianDayTrks.shp) has both the line name and Julian day of collection. Each polyline shapefile was then appended into the master feature class within a file geodatabase (SurveyNameBSTrks). Tracklines were created during each survey in 2011, 2012, and 2013. Person who carried out this activity:
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Date: 24-Mar-2014 (process 3 of 5)
    Step 3: Create SWATHplus-H backscatter tracklines for data collected in Barnegat and Little Egg Inlets. The backscatter navigation for lines collected using the SWATHplus-H were converted to a polyline shapefile using the methods described in "BarnBayBathTrks.shp" published in this report (http://pubs.usgs.gov/ds/0937/downloads/shapefile/BarnBayBathTrks.zip) because the SWATHplus-H sonar collects bathymetry and backscatter concurrently for all lines. Using the BarnBayBathTrks.shp as a source, each trackline in the Barnegat and Little Egg Inlets were manually selected in ArcMap (v. 9.3.1) and exported to a separate shapefile using the context menu with in ArcMap (v.9.3.1). The "Grid" attribute for the bathymetry tracklines was deleted after exporting to a shapefile. Person who carried out this activity:
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Data sources used in this process:
    • BarnBayBathTrks.shp
    Date: 24-Mar-2014 (process 4 of 5)
    Step 4: Merge the towed backscatter tracklines with the SWATHplus tracklines. The feature class containing towed backscatter (Klein3000 and EdgeTech 4200) tracklines for each of the four surveys (SurveyNameBSTrks) was merged with the tracklines (SPInletTrks.shp) from Barnegat and Little Egg Inlets using the SWATHplus sonar to create the final polyline shapefile (BarnBayBathTrks.shp) containing all the line files that were used to produce the three backscatter mosaics in this publication. Person who carried out this activity:
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Date: 20-Jul-2018 (process 5 of 5)
    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
  3. What similar or related data should the user be aware of?
    Danforth, William W., 1997, XSonar/ShowImage: A complete system for rapid sidescan-sonar processing and display.: Open-File Report 97-686, 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?
    KLEIN 3000 and EDGETECH 4200 Navigation for these data were recorded using a Hemisphere DPGS receiver located on top of the cabin house of the R/V Rafael. Offsets between the antenna and sidescan towfish were measured, recorded, and accounted for in the Klein SonarPro acquisition software (v. 10.0) and SonarWiz (v. 7.02).The DGPS is accurate to within 1-2 meters. SWATHPLUS-H Real Time Kinematic (RTK) navigation was used to determine the horizontal position (x, and y coordinates) of the GPS antenna mounted above the SWATHplus-H transducers with sub-meter accuracy. A RTK-enabled motion reference unit (Coda Octopus F190) was mounted directly above the sonar transducers and continuously measured vertical displacement (heave) and attitude (pitch and roll) of the vessel during data acquisition. Horizontal offsets between navigation and attitude antennas and the SWATHplus-H transducers were applied during acquisition in the configuration files for the SWATHplus-H and Coda Octopus F190 software.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This data set includes only those lines that were used to generate the three backscatter mosaics published in this report.
  5. How consistent are the relationships among the observations, including topology?
    Navigation was checked for consistency and any erroneous points were removed during processing. Duplicate names may exist for the "LineName" attribute; however a further query of the data by the "Survey" attribute will produce unique tracklines for each record in this spatial dataset.

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)
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    bandrews@usgs.gov
  2. What's the catalog number I need to order this data set? BarnBayBSTrks.zip: contains BarnBayBSTrks.shp and the associated shapefile files, BarnBayBSTrks.jpg browse graphic, and the associated FGDC metadata.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, 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?
    This zip file contains data available in shapefile format. The user must have software capable of uncompressing the WinZip file and displaying the shapefile.

Who wrote the metadata?

Dates:
Last modified: 20-Jul-2018
Metadata author:
Brian Andrews
U.S. Geological Survey
Geographer
384 Woods Hole Rd.
Woods Hole, MA
USA

508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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