Archive of Digital Boomer Subbottom Profile Data Collected in the Atlantic Ocean Offshore Northeast Florida During USGS Cruises 03FGS01 and 03FGS02 in September and October of 2003

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Frequently anticipated questions:

What does this data set describe?

Title:
Archive of Digital Boomer Subbottom Profile Data Collected in the Atlantic Ocean Offshore Northeast Florida During USGS Cruises 03FGS01 and 03FGS02 in September and October of 2003
Abstract:
In September and October of 2003, the U.S. Geological Survey (USGS), in cooperation with the Florida Geological Survey, conducted geophysical surveys of the Atlantic Ocean offshore northeast Florida from St. Augustine, Florida, to the Florida-Georgia border. This report serves as an archive of unprocessed digital boomer subbottom profile data, trackline maps, navigation files, Geographic Information System (GIS) files, Field Activity Collection System (FACS) logs, and formal Federal Geographic Data Committee (FGDC) metadata. Filtered and gained (a relative increase in signal amplitude) digital images of the seismic profiles are also provided.
Supplemental_Information:
The USGS St. Petersburg Coastal and Marine Science Center (SPCMSC) in Florida assigns a unique identifier to each cruise or field activity. For example, 03FGS01 tells us the data were collected in 2003 as part of cooperative work with the Florida Geological Survey (FGS) and that the data were collected during the first field activity for that project in that calendar year. Refer to http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html for a detailed description of the method used to assign the field activity ID. The naming convention used for each seismic line is as follows: yye##a, where 'yy' are the last two digits of the year in which the data were collected, 'e' is a 1-letter abbreviation for the equipment type (for example, b for boomer), '##' is a 2-digit number representing a specific track, and 'a' is a letter representing the section of a line if recording was prematurely terminated or rerun for quality or acquisition problems. The boomer plate is an acoustic energy source that consists of capacitors charged to a high voltage and discharged through a transducer in the water. The transducer is towed on a sled floating on the water surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water, sediment column, or rock beneath. The acoustic energy is reflected at density boundaries (such as the seafloor, sediment, or rock layers beneath the seafloor), detected by the hydrophones, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (for example, 0.5 seconds) and recorded for specific intervals of time (for example, 100 milliseconds). In this way, a two-dimensional (2-D) vertical profile of the shallow geologic structure beneath the ship track is produced. For both cruises, a C-Products C-Boom power supply provided 100 -110 joules per shot. Reflected energy was received by a Benthos MESH streamer and recorded by Triton Elics International, Inc. (TEI) Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced every 12 inches. Refer to the handwritten FACS operation log included with this archive for diagrams and descriptions of acquisition geometry, which varied throughout the cruises. The sample frequency of the data is 20-24 kilohertz, the record length is 100 milliseconds, and the shot rate was every 0.5 seconds. Shot spacing was approximately every 1 meter. The binary portion of the unprocessed seismic data are stored in SEG Y (rev. 0), integer, Motorola format, which is a standard digital format that can be read and manipulated by all seismic processing software packages (Barry and others, 1975), with the exception of the first 3,200 bytes of the card image header, which are stored in ASCII format instead of the standard EBCDIC format. The SEG Y formatted trace files have a .tra extension. Additional recording parameters for each trace file can also be found in the .par file associated with each .tra file. However, the .par and .pln files included here are needed only to process or display the data with TEI Delph Seismic software. The SEG Y files may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2005). Also provided are example SU scripts that allow the user to strip off navigation fixes from the SEG Y headers, along with a fix for every 500 shots, and produce a printable, gained GIF image of each profile. The printable profiles provided here are GIF images that were filtered and gained using SU software. Refer to the Software page for links to example SU processing scripts and USGS software for viewing the SEGY files (Zihlman, 1992). The SEG Y files are available on the DVD version of this report or on the Web, downloadable via the USGS Coastal and Marine Geoscience Data System (http://cmgds.marine.usgs.gov). The data is also available for viewing using GeoMapApp (http://www.geomapapp.org) and Virtual Ocean (http://www.virtualocean.org) multi-platform open source software.
  1. How might this data set be cited?
    Calderon, Karynna, Forde, Arnell S., Dadisman, Shawn V., Wiese, Dana S., Phelps, Daniel C., U.S. Geological Survey, and Survey, Florida Geological, 2012, Archive of Digital Boomer Subbottom Profile Data Collected in the Atlantic Ocean Offshore Northeast Florida During USGS Cruises 03FGS01 and 03FGS02 in September and October of 2003: U.S. Geological Survey Data Series 670, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -81.382166
    East_Bounding_Coordinate: -81.116332
    North_Bounding_Coordinate: 30.709674
    South_Bounding_Coordinate: 29.883766
  3. What does it look like?
    http://pubs.usgs.gov/ds/670/all.jpg (JPEG)
    Trackline map of digital boomer subbottom profile data collected during USGS cruises 03FGS01 and 03FGS02. This map was created at a scale of 1:750,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/670/maps/area_a.jpg (JPEG)
    Trackline map of digital boomer subbottom profile data collected in Area A (refer to the full survey area map) during USGS cruises 03FGS01 and 03FGS02. This map was created at a scale of 1:200,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/670/maps/area_b.jpg (JPEG)
    Trackline map of digital boomer subbottom profile data collected in Area B (refer to the full survey area map) during USGS cruises 03FGS01 and 03FGS02. This map was created at a scale of 1:200,000. Refer to the Lineage section below for the trackline map creation process.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 22-Sep-2003
    Ending_Date: 22-Oct-2003
    Currentness_Reference:
    Data collection interval
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Tabular, vector, and raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Horizontal X and Y locations (latitude and longitude and UTM coordinates) for each shot are provided in ASCII position files, along with the date and time (Greenwich Mean Time) the shot was recorded.
    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 0.0000027. Longitudes are given to the nearest 0.0000027. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222101000020000.
  7. How does the data set describe geographic features?
    03fgs01.txt, 03fgs02.txt, s03fgs01.txt, and s03fgs02.txt
    Shotpoint navigation files (Source: Society of Exploration Geophysicists (SEG) Y headers (http://www.seg.org/resources/publications/misc/technical-standards).)
    FID*
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape*
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    Lon
    Longitude (decimal degrees) (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:-81.382166
    Maximum:-81.116332
    Lat
    Latitude (decimal degrees) (Source: World Geodetic System 1984 Geographic Coordinate System)
    Range of values
    Minimum:30.709674
    Maximum:29.883766
    Line
    Trackline number (Source: U.S. Geological Survey) Individual line names: test1 - t1.
    Shot
    Shotpoint number (Source: U.S. Geological Survey)
    Range of values
    Minimum:1
    Maximum:20000
    UTMX
    UTM-X coordinate (Zone 17N) (Source: Universal Transverse Mercator Geographic Coordinate System)
    Range of values
    Minimum:463383
    Maximum:488780
    UTMY
    UTM-Y coordinate (Zone 17N) (Source: Universal Transverse Mercator Geographic Coordinate System)
    Range of values
    Minimum:3305925
    Maximum:3397467
    YEAR
    Year (in YYYY format) (Source: U.S. Geological Survey)
    Range of values
    Minimum:2003
    Maximum:2003
    DOY:HR:MIN:SEC
    Day of year and Time (GMT) (Source: Coordinated Universal Time) Date and time in GMT format (day of year:hour:minute:second)
    Entity_and_Attribute_Overview:
    Binary data file: Trace data are available as binary files in SEG Y format. These files have a .tra extension and measure 1.3 to 96.1 megabytes. To access these files please go to http://pubs.usgs.gov/ds/670/segy/.
    Entity_and_Attribute_Overview:
    Graphic image file: Printable profiles are available as GIF images. The trackline maps are JPEG images. The trackline maps contain links to the printable seismic profile GIF images. To access these files please go to http://pubs.usgs.gov/ds/670/profiles/printable.
    Entity_and_Attribute_Overview:
    Navigation file: Navigation files are available as comma delimited ASCII text files; to access these files please go to http://pubs.usgs.gov/ds/670/nav. Provided are raw (unprocessed) shotpoint navigation files, processed shotpoint navigation files, and processed 500-shot-interval location files. Fields/Attributes [FID, Shape] marked above with an asterisk (*) were created by ESRI ArcGIS software and are used exclusively by the shapefiles created from the aforementioned text files; these fields are not included in the original navigation files. All remaining attributes listed in the above section that do not have an accompanying asterisk are found in 03fgs01.txt, 03fgs02.txt, s03fgs01.txt, and s03fgs02.txt.
    Entity_and_Attribute_Overview:
    GIS file: The GIS project used to create the trackline maps is provided as a zip file composed of ESRI map documents, shapefiles, and metadata. To access these files please go to http://pubs.usgs.gov/ds/670/software/arc
    Entity_and_Attribute_Detail_Citation:
    Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for digital tape formats: Geophysics, v. 40, no. 2, p. 344-352. Available online at http://www.seg.org/resources/publications/misc/technical-standards.
    Entity_and_Attribute_Detail_Citation:
    Cohen, J.K., and Stockwell, J.W., Jr., 2005, CWP/SU: Seismic Unix Release 39: A free package for seismic research and processing: Golden, Colo, Center for Wave Phenomena, Colorado School of Mines. Available online at http://www.cwp.mines.edu/cwpcodes/index.html.
    Entity_and_Attribute_Detail_Citation:
    Zihlman, F.N., 1992, DUMPSEGY v.1.0: A program to examine the contents of SEG Y disk-image seismic data: U.S. Geological Survey Open-File Report 92-590, 28 p. Available online at http://pubs.usgs.gov/of/1992/0590/report.pdf.
    Entity_and_Attribute_Detail_Citation:
    Disc Image Credit: Descloitres, J., MODIS Land Rapid Response Team at the NASA Goddard Space flight Center, 2003, Florida. A2003044.jpg. Available online at http://visibleearth.nasa.gov.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karynna Calderon
    • Arnell S. Forde
    • Shawn V. Dadisman
    • Dana S. Wiese
    • Daniel C. Phelps
    • U.S. Geological Survey
    • Florida Geological Survey
  2. Who also contributed to the data set?
    Funding and (or) support for this study was provided by the USGS CMGP and the Florida Geological Survey (FGS). We thank R/V Geoquest captain Wade Stringer of the FGS for his assistance in data collection and Janice A. Subino (contracted with Jacobs Technology, Inc., at the SPCMSC) for her assistance in the preparation of this document. This document was also improved by the reviews of Jack Kindinger (SPCMSC) and Barbara Poore (SPCMSC).
  3. To whom should users address questions about the data?
    Arnell Forde
    U.S. Geological Survey
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8111 (voice)
    aforde@usgs.gov

Why was the data set created?

To archive all digital boomer subbottom profile data collected during cruises 03FGS01 and 03FGS02 and associated files.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2004 (process 1 of 6)
    Boomer processing: 03FGS01 line t4 and 03FGS02 line sj51 were divided into two lines each (for example, t4 became t4a and t4b) because the original total number of traces exceeded the maximum allowed by the processing system. The SEG Y data were processed with Seismic Unix software to produce the GIF seismic profile images included in this report. A representative boomer processing sequence consisted of (1) running a bandpass filter of 300-500-2,500-3,000 hertz, (2) applying automatic gain control, (3) displaying PostScript, and (4) converting of PostScript image to a GIF image. Person who carried out this activity:
    Arnell Forde
    U.S. Geological Survey
    Geologist
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8111 (voice)
    aforde@usgs.gov
    Data sources used in this process:
    • SEG Y
    Data sources produced in this process:
    • printable/SEG Y.gif
    • geospatial/SEG Y.jpg
    Date: 2004 (process 2 of 6)
    Navigation processing: Navigation files were extracted from the trace headers of each line using Seismic Unix software and edited to remove spurious data points and fix incorrectly recorded dates. They were then processed with PROJ.4 software (http://trac.osgeo.org/proj) to generate Zone 17 UTMs from latitude and longitude and reformatted for use with Environmental Systems Research Institute (ESRI) GIS software. Person who carried out this activity:
    Arnell Forde
    U.S. Geological Survey
    Geologist
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8111 (voice)
    aforde@usgs.gov
    Data sources used in this process:
    • 03fgs01.txt, s03fgs01.txt, 03fgs01_s.txt; 03fgs02.txt, s03fgs02.txt, 03fgs02_s.txt
    Data sources produced in this process:
    • 01trkln.shp, 01sht.shp, 01sol.shp
    • 02trkln.shp, 02sht.shp, 02sol.shp
    Date: 2004 (process 3 of 6)
    Trackline map creation: The trackline maps provided in this archive were created using ESRI ArcGIS 8.3 and 10 GIS software, exported to Adobe Illustrator for further editing, and saved in JPEG format. The cities and states layers are St. Johns River Water Management District (SJRWMD) data sets. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The USGS is the originator of all other layers. Person who carried out this activity:
    Arnell Forde
    U.S. Geological Survey
    Geologist
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8111 (voice)
    aforde@usgs.gov
    Data sources used in this process:
    • SJRWMD and ESRI
    Data sources produced in this process:
    • all.mxd, area_a.mxd, and area_b.mxd
    • all.jpg, area_a.jpg, and area_b.jpg
    Date: 2004 (process 4 of 6)
    Data Series preparation: In addition to the process steps above, the following steps were taken to produce this Data Series: the handwritten logs were scanned and saved as PDF files, digital FACS logs were created using the handwritten logs and personal accounts of the crew members and saved as PDF files, and an HTML-based format was used to present the various parts of this archive.
    Date: 24-Jan-2017 (process 5 of 6)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 13-Oct-2020 (process 6 of 6)
    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?

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

  1. How well have the observations been checked?
    The validity or accuracy of marine subbottom profile profiles is highly qualitative and depends on equipment and operating condition variables. Visual inspection of the images rendered from the data did not show any major anomalies.
  2. How accurate are the geographic locations?
    As the subbottom profile data were acquired, the position of the vessel was continuously determined by a CSI Wireless DGPS receiver, which is accurate to 3 meters. Positions were recorded and written to the trace headers in latitude and longitude about every 1 to 15 seconds. The navigation data have not been corrected to reflect the unknown offset between the shotpoint and GPS antenna.
  3. How accurate are the heights or depths?
    Boomer data are relative to sea level. However, varying recorded static shifts of the data have been known to occur. Therefore, these data are not to be used for bathymetry.
  4. Where are the gaps in the data? What is missing?
    These data are collected along tracklines (2-D) and are therefore inherently incomplete. Geologic details between lines must be inferred. No data were collected for 03FGS01 line test2 or 03FGS02 line sj5. Navigation is intermittent for 03FGS01 lines sj17 and sj15. On the trackline maps, the location of missing navigation data within a line is inferred by linear interpolation of the first and last known data points, and large gaps are represented by a dashed yellow line.
  5. How consistent are the relationships among the observations, including topology?
    These data sets are from two different field activities. Differences occur in navigation, acquisition equipment, and acquisition geometery between vessels and field activities.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The USGS and FGS request to be acknowledged as originators of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Arnell Forde
    U.S. Geological Survey
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8111 (voice)
    aforde@usgs.gov
    Contact_Instructions:
    All of this report is available online. The SEG Y files are downloadable only from the Coastal and Marine Geoscience Data System (http://cmgds.marine.usgs.gov).
  2. What's the catalog number I need to order this data set? U.S. Geological Survey Data Series 670
  3. What legal disclaimers am I supposed to read?
    This DVD publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The SEG Y files on this disc conform to the SEG Y standard format (Barry and others, 1975), with the exception of the 3,600-byte reel identification header that is in ASCII format. Standard SEG Y uses an EBCDIC 3,600-byte reel identification header. in format SEG Y Size: 1600
      Media you can order: DVD (format ISO 9660)
      Note: UNIX, Linux, DOS, Macintosh
      Data format: The GIS project used to create the trackline maps is composed of map documents, shapefiles, and metadata. Map documents were created using ESRI ArcView 3.3 and ArcGIS 8.3 and 10 GIS software. The shapefiles provided may also be viewed using other versions of ArcView, ArcGIS, or public-domain software ArcExplorer (http://www.ESRI.com/software/arcexplorer/index.html) or GeoMapApp (http://www.geomapapp.org), which are compatible with all platforms. in format map document, shapefile, metadata Size: 55.7
      Network links: http://pubs.usgs.gov/ds/670/software/arc/
      Data format: The SEG-Y standard format (Barry and others, 1975) consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an ASCII header block followed by a 400-byte binary header block, both of which include information specific to line and reel number; a trace data block that follows the reel identification header, with the first 240 bytes of each trace block consisting of the binary trace identification header; and seismic data samples that follow the trace identification header. in format SEG-Y Data download
      Network links: http://cmgds.marine.usgs.gov/data/03FGS01/boomer/
      http://cmgds.marine.usgs.gov/data/03FGS02/boomer/
    • Cost to order the data: None, if obtained online.

    • Special instructions:
      Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov).
  5. What hardware or software do I need in order to use the data set?
    Use of SEG Y data requires specialized seismic processing software, such as public domain software Seismic Unix (http://www.cwp.mines.edu/cwpcodes/index.html).

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
Arnell Forde
U.S. Geological Survey
Geologist
U.S. Geological Survey, 600 4th Street South
St. Petersburg, FL
USA

(727) 502-8111 (voice)
aforde@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/DS-670.faq.html>
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