Seismic shots at 100 shot intervals collected using an EdgeTech 424 chirp seismic-reflection data by the U.S. Geological Survey in the Barnegat Bay, NJ in 2011, 2012, and 2013 (Esri point shapefile, Geographic, WGS 84).

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Frequently anticipated questions:

What does this data set describe?

Title:
Seismic shots at 100 shot intervals collected using an EdgeTech 424 chirp seismic-reflection data by the U.S. Geological Survey in the Barnegat Bay, NJ in 2011, 2012, and 2013 (Esri point 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 at 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, Seismic shots at 100 shot intervals collected using an EdgeTech 424 chirp seismic-reflection data by the U.S. Geological Survey in the Barnegat Bay, NJ in 2011, 2012, and 2013 (Esri point 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: -74.318597
    East_Bounding_Coordinate: -74.049522
    North_Bounding_Coordinate: 40.090249
    South_Bounding_Coordinate: 39.468325
  3. What does it look like?
    BarnBaySeisShot100.jpg (JPEG)
    Thumbnail image of seismic shots 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):
      • Entity point (32211)
    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?
    BarnBaySeisShot100
    shot point navigation for seismic profiles at 100 shot intervals (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.
    east
    Easting coordinate in UTM Zone 18 meters, WGS 84 (Source: USGS)
    Range of values
    Minimum:558582.7
    Maximum:581071.63
    Units:meters
    Resolution:0.1
    north
    Northing coordinate in UTM Zone 18 meters, WGS 84 (Source: USGS)
    Range of values
    Minimum:4368982.23
    Maximum:4438190.83
    Units:meters
    Resolution:0.01
    lon
    Longitude coordinate in decimal degrees, WGS 84 (Source: USGS)
    Range of values
    Minimum:-74.318597
    Maximum:-74.049522
    Units:decimal degrees
    Resolution:0.000001
    lat
    Latitude coordinate in decimal degrees, WGS 84 (Source: USGS)
    Range of values
    Minimum:39.468325
    Maximum:40.090249
    Units:decimal degrees
    Resolution:0.000001
    line
    name of seismic line file. (Source: USGS) character set.
    shot
    shot number (first, last and every 100 interval between) (Source: USGS)
    Range of values
    Minimum:1
    Maximum:21740
    Units:shot number
    Resolution:1.0
    year_
    Calendar year data were collected (Source: USGS)
    Range of values
    Minimum:2011
    Maximum:2013
    Units:calendar year
    Resolution:1
    JD
    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
    sonar
    Type of seismic sonar used to collect data (Source: USGS) character set
    vessel
    Name of survey vessel (Source: USGS) character set
    time_utc
    Time of shot in Universal Coordinated Time (HH:MM:SS) (Source: USGS) character set
    SurveyID
    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

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 seismic shot point navigation for approximately 2092 kilometers of seismic profile lines collected using a EdgeTech 424 seismic reflection profiler. The purpose of this shapefile is to provide shot navigation at 100 shot intervals to correlate to shot spacings labeled in the hyperlink to the PNG image file 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 files (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, 512i 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). During the survey, data were acquired using a 250 ms shot rate with a 5 ms transit pulse length, logging 100 ms of data per trace. 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 7)
    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 7)
    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: Mar-2014 (process 3 of 7)
    Step 3: Convert 100 Shots to feature class. Shot point positions at 100 shot intervals for each Julian Day were concatenated and saved as a comma delimited file ("JDXXX"_100Shot.csv). An AWK script was used to add and populate attribute fields 'Survey', 'sonar', and 'vessel'. Text files containing 100 shot navigation for each Julian Day was converted to a file geodatabase feature class using the context menu within ArcCatalog (v. 9.3.1). Input file= JDXXX_100Shot.csv, output file= JDXXX100Sht. Next, the feature classes for each Julian Day of a survey were merged to create on feature class for each field activity number (survey). Input file= JDXXX_100Sht, output=SeismicShot100_"Survey". Finally the 100 shot feature classes from the four surveys were merged into one point feature class using the merge tool in ArcCatalog (v.9.3.1). Input files= SeismicShot100_2011-041, SeismicShot100_2012_003, SeismicShot100_2013_014, SesimicShot100_2013_030. Output featureclass= "BarnBaytSeisShot100" 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 7)
    Step 4 Convert feature class to shapefile. Before converting the file geodatabase feature class to a shapefile, a new string attribute "time" was added using the "add field" tool within ArcCatalog (v.9.3.1). The new "time" attribute was calculated using the "UTC" date/time attribute. The feature class was exported from the table of contents in ArcMap (v.9.3.1) to a shapefile (BarnBaySeisShot100.shp) using the coordinate system of the data frame (Geographic, WGS 84). Finally the "UTC" data/time field, and the "OBJECT_ID fields from the original feature class were deleted from the new 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
    Date: 20-Jul-2018 (process 5 of 7)
    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: 15-Nov-2019 (process 6 of 7)
    Crossref DOI link was added as the first link in the metadata. 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: 08-Sep-2020 (process 7 of 7)
    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?
    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 ± 3-5 meters (taking into account the navigation issues described in the Logical Consistency Report.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    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. Some of these offset shots included the 100 shot interval extracted for this shapefile. These shots were not removed from the "BarnBaySeisShot100.shp" The navigation for these two days were edited (prior to generating the trackline and after generating the "BarnBayShot100.shp") 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, however, they can still be used to identify distance along the line when viewing the seismic profile images.

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? BarnBaySeisShot100.zip: contains BarnBaySeisShot100.shp and the associated shapefile files, BarnBaySeisShot100.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 shapefile format. The user must have software capable of uncompressing the WinZip file and displaying the shapefile.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
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/data_series/DS-937/BarnBaySeisShot100.faq.html>
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