Survey lines along which EdgeTech 424 chirp seismic-reflection data were collected by the U.S. Geological Survey in the Barnegat Bay, NJ 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 lines along which EdgeTech 424 chirp seismic-reflection data were collected by the U.S. Geological Survey in the Barnegat Bay, NJ 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, data were collected 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. More information about the individual USGS surveys conducted as part of this study can be found on Woods Hole Coastal and Marine Science Center Field Activity webpages: 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 lines along which EdgeTech 424 chirp seismic-reflection data were collected by the U.S. Geological Survey in the Barnegat Bay, NJ 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: -74.318611
    East_Bounding_Coordinate: -74.049497
    North_Bounding_Coordinate: 40.090249
    South_Bounding_Coordinate: 39.468325
  3. What does it look like?
    BarnBaySeisTrks.jpg (JPEG)
    Thumbnail image of seismic tracklines collected within Barnegat Bay, NJ. 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 (1039)
    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?
    BarnBaySeisTrks
    polyline shapefile of seismic profile tracklines collected in Barnegat Bay, New Jersey. (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.
    line
    Name of data file (Source: USGS) Character set.
    survey
    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) Character set.
    sonar
    Sonar device used to collect seismic-reflection data (Source: USGS)
    Formal codeset
    Codeset Name:EdgeTech 424
    Codeset Source:USGS
    vessel
    Name of survey vessel (Source: USGS)
    Formal codeset
    Codeset Name:R/V Rafael
    Codeset Source:USGS
    Shape_Leng
    Length of each feature in meters calculated using the UTM Zone 18 (WGS 84) coordinate system (Source: USGS)
    Range of values
    Minimum:124.86
    Maximum:7745.5
    Units:meters
    hyperlink
    pathway to the linked seismic-profile image for viewing in ArcMap map document (*.mxd). (Source: USGS) Character set.
    image
    name of the PNG file for each line. (Source: USGS) Character set.
    year
    The year the data were collected. (Source: USGS)
    Range of values
    Minimum:2011
    Maximum:2013
    Units:Calendar year
    Resolution:1
    JulDay
    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:99
    Maximum:254
    Resolution:1
    ShotStart
    First shot number in seismic profile (Source: USGS) Character set.
    ShotEnd
    Last shot number in seismic profile (Source: USGS) Character set.
    Entity_and_Attribute_Overview:
    The attribute "hyperlink" can be used to link the seismic trackline feature with the corresponding seismic image profile (PNG) for use with the hyperlink tool. This tool depends on existing folder structure to work properly. The user will need to have the following local folder structure to work as described in the "Data Catalog" Section of the report. The user will need to save an ArcMap (*.mxd) document under the main folder and set the "Hyperlink base" to "hyperlink_images\" .Then set the display properties of BarnBaySeisTrks.shp by selecting"Hyperlinks:Support Hyperlinks using field:" and select the "hyperlink" attribute.
    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?
    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?

This dataset contains trackline navigation for approximately 2092 km of seismic profile lines collected using a EdgeTech 424 seismic reflection profiler. The purpose of this shapefile is to manage the 1039 features and provide a hyperlink to the PNG image of the seismic-reflection profile.

How was the data set created?

  1. From what previous works were the data drawn?
    SEG-Y and JSF 512i data (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, Seismic navigation.

    Type_of_Source_Media: disc
    Source_Contribution:
    Seismic profile data were collected along approximately 2092 kilometers of survey lines using an EdgeTech 424 subbottom profiling system (frequency modulation swept frequency 4-24 kHz) which was towed from the starboard side of the R/V Rafael. SonarWiz seismic-acquisition software was used to control the EdgeTech 3100 portable topside unit, digitally log trace data in SEG-Y rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arcseconds of latitude and longitude, multiplied by a scalar of 100). Data were acquired using a 250 ms shot rate with a 5 ms transit pulse length, logging 100 ms of data per trace during the first day (Julian day 305) of survey 2011-014-FA. The shot rate was changed on Julian day 306 to a 500 ms but maintained a record length of 100 ms. This shot rate was maintained for the remainder of survey 2011-014-FA. A shot rate of 250 ms was used for all three remaining surveys. A swept frequency spectrum of 4-24 kHz was used for the entire survey, selectable via SonarWiz communicating with the EdgeTech 3100 topside controller. DGPS navigation was supplied by a Hemisphere receiver with the antenna located on the port side aft cabin. Cable layback is 4 meters, depth below water line 0.5 meters. GPS offset from sheave: x = 2.38, y = .62, z = 0. Entered these values into SonarWiz starting with line 1. Seismic-reflection data were processed using SIOSEIS (2011) and Seismic Unix (Stockwell and Cohen, 2008). All navigation data were extracted from trace headers, edited, and saved as ASCII text files.
  2. How were the data generated, processed, and modified?
    Date: 2013 (process 1 of 6)
    Step 1: SIOSEIS (version 2010.2.25) was used to read SEG-Y files, renumber shots starting from one, and write out new SEG-Y files. The original shot numbers, which were assigned by SonarWiz sequentially over the duration of an acquisition session despite SEG-Y file changes, are preserved in the raw SEG-Y data. 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: 2013 (process 2 of 6)
    Step 2: Seismic Unix (version 4.2) was used to read renumbered SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, longitude, latitude, year, Julian day, and time of day (UTC). Geographic coordinates (WGS84) were converted to UTM zone 18 coordinates (WGS 84) using Proj (version 4.6.0). Header information from each SEG-Y file was saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 100, and shots with unique navigation coordinates. End shots and shots at multiples of 100 may not have unique navigation coordinates. A 100 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile PNG images. 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: 2014 (process 3 of 6)
    Step 3: Convert Unique Shots to Point Feature Class: Text files containing unique shot point positions for seismic lines from each Julian Day (JDXXX_UniqueShot.csv) were concatenated and saved as a comma delimited file ("SurveyName"_UniqueShot.csv) for each of the four surveys. These four csv files were then converted to a point feature class ("SurveyName"UniqueShot) using the Create Feature Class from XY Table context menu within ArcCatalog (v. 9.3.1). The Lon and Lat fields were used as the coordinates for the output feature class. 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: 2014 (process 4 of 6)
    Step 4 Convert points to lines. The point feature class containing unique shot point positions, created in the previous step, was converted to a polyline shapefile (BarnBaySeisTrks.shp) using "points to lines v2" a script distributed in "VACExtras" (version 2.1), a VB collection of tools developed by VeeAnn Cross (U.S. Geological Survey), which converts point data to a new polyline shapefile based on record order. The "Line" attribute was used as the line value and the first occurrence of the following fields were transferred from the points to lines: 'Image', 'Shot', 'Year', 'JulDay', 'Survey', 'Sonar', 'Vessel'. The last occurrence of 'Shot' was also carried over so that the first and last shot of each line were recorded in the 'ShotStart' and 'ShotEnd' attributes. 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: Sep-2014 (process 5 of 6)
    Step 5: Add final attributes and merge into one polyline feature class. Merged the four individual polyline shapefiles ('SurveyName'SeisTrks.shp) into one shapefile (BarnBaySeisTrks.shp) using the "Merge" feature within ArcToolbox Data Management Tools (v. 9.3.1). Two new text attributes 'Survey' and "hyperlink' were added to the final BarnBaySeisTrks.shp using the options context menu with in ArcCatalog (v. 9.3.1) . The SurveyID attribute was then populated using the 'Field Calculator" context menu in ArcMap (v. 9.3.1) to convert the integer format used in the navigation scripts to the Woods Hole Coastal and Marine Science Center Field Activity Number format. For example the integer value ?' was converted the string -041-FA'. Finally the old integer 'Survey' attribute was deleted and the new 'SurveyID' field was renamed 'Survey'. The 'hyperlink' field is used by the hyperlink tool in ArcMap (v. 9.x) to set the pathway to the individual seismic profile image for each seismic trackline. The pathway produced using the 'Field Calculator' context menu within ArcMap (v. 9.3.1) by adding 'seismic_profiles\"surveyname"\ to the 'image' attribute. The pathway to the image is based on file structure explained in the downloads Section of this report http://pubs.usgs.gov/ds/0937/ so that the user can save an ArcMap document (mxd) at the top level of folder structure and utilize the hyperlink attribute in the seismic tracks to view the profile images 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 6 of 6)
    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?
    Stockwell, John, 2011, CWP/SU: Seismic Unix: Center for Wave Phenomena - Colorado School of Mines, Golden, CO.

    Online Links:

    Henkart, Paul, 2011, SIOSEIS: Scripps Institution of Oceanography, University of California - San Diego, LaJolla, CA.

    Online Links:

    Norris, Michael W., and Faichney, Alan K., 2002, SEGY Rev.1 Data Exchange Format1: Society of Exploration Geophysicists, Tulsa, OK.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    All attributes were checked for consistency between the four surveys.
  2. How accurate are the geographic locations?
    The EdgeTech 424 subbottom profiling systems was towed from a davit mounted on the starboard side of the R/V Rafael. Cable layback was 4 meters, depth below the water line was 0.5 meters. GPS offset from sheave: x = 2.38, y = .62, z = 0. All offset values were entered into SonarWiz (ver. 5.03 ) starting with line 1. The actual position of the towfish in relation to the DGPS receiver was calculated during post processing based on the layback and offset values entered in the SonarWiz acquisition software. Horizontal position accuracy is assumed to be ± 2 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Seismic lines that were shorter than 100 shots and did not record usable data were not included. Gaps in sequential line numbers may exist.
  5. How consistent are the relationships among the observations, including topology?
    During Julian day 309 and 310 of survey 2011-041-FA the depths from the Garmin fathometer was logged directly to the SEGY header for heave corrections. Although the depths were recorded to the SEGY, the x,y coordinates of the navigation were occasionally recorded ~ 10m offset from the trackline. The navigation for these two days were edited (prior to generating the trackline) to remove these erroneous points produced from recording the depth to the SEGY header. As a result, some of the 100 shot intervals in the "BarnBaySeisShot100" point shapefile, do not fall directly on this "BarnBaySeisTrks.shp" polyline shapefile. For each seismic trackline there is one seismic-profile image that is hyperlinked by the field 'Image'. No duplicates exist.

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? BarnBaySeisTrks.zip: contains BarnBaySeisTrks.shp and the associated shapefile files, BarnBaySeisTrks.jpg browse graphic, and the associated FGDC metadata. The zip file also contains four comma delimited files (2011_041_UniqueShot.csv, 2012_003_UniqueShot.csv, 2013_014_UniqueShot.csv, and 2013_030_UniqueShot.csv)of the unique shot files for each of the four surveys used to produce the polyline shapefile.
  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 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)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/eastcoast/midatl/barnegat_bay/BarnBaySeisTrks.faq.html>
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