Archive of Digital Boomer Seismic Reflection Data Collected During USGS Field Activity 04SGI01 in the Withlacoochee River of West-Central Florida, March 2004

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Frequently anticipated questions:

What does this data set describe?

Title:
Archive of Digital Boomer Seismic Reflection Data Collected During USGS Field Activity 04SGI01 in the Withlacoochee River of West-Central Florida, March 2004
Abstract:
In March of 2004, the U.S. Geological Survey conducted a geophysical survey in the Withlacoochee River of west-central Florida. This report serves as an archive of unprocessed digital boomer seismic reflection data, trackline maps, navigation files, GIS information, Field Activity Collection System (FACS) logs, observer's logbook, and FGDC metadata. Filtered and gained digital images of the seismic profiles are also provided.
The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG-Y format (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU). Example SU processing scripts and USGS software for viewing the SEG-Y files (Zihlman, 1992) are also provided.
For more information on the seismic surveys see http://walrus.wr.usgs.gov/infobank/w/w104fl/html/w-1-04-fl.meta.html
These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.
Supplemental_Information:
The USGS Florida Integrated Science Center (FISC) - St. Petersburg assigns a unique identifier to each cruise or field activity. For example, 04SGI01 tells us the data were collected in 2004 for the Surface Groundwater Interactions (SGI) Project and 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 is the last two digits of the year in which the data were collected, e is a 1-letter abbreviation for the equipment type (i.e., b for boomer and c for chirp), ## 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 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 at the water surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water and sediment column. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), detected by the receiver, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (e.g., 0.25 s) and recorded for specific intervals of time (e.g., 100 ms). In this way, a two-dimensional vertical image of the shallow geologic structure beneath the ship track is produced. A C-Products C-Boom power supply provided 100 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 ten hydrophones evenly spaced about every 30.5 cm (every 12 inches). The sample frequency of the data is 24 kHz. Record length for all tracklines is 100 ms, and the shot rate was every 0.25 s. Shot spacing varied and should be calculated for each line of interest. Coherent noise was detected on most of the profiles. Attempts to mitigate the noise had varying degrees of success and included frequent changes in the acquisition geometry and grounding of the power supply. The source of the noise remains uncertain, but a new generator or the engine propeller might be the origin. Figure 1 included with this archive (Data Series 119) displays acquisition geometries for this field activity. For more information about the acquisition geometry, refer to the science logbook and handwritten FACS logs also included with this archive. The unprocessed seismic data are stored in SEG-Y, integer, Motorola format, which is a standard digital format that can be read and manipulated by most seismic processing software packages (Barry and others, 1975). 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 only needed to process or display the data with TEI Delph Seismic software. Also provided are example Seismic Unix 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 filtered and gained GIF image of each profile. The printable profiles provided here are GIF images that were filtered and gained using Seismic Unix software. The processed SEG-Y data were then exported to Chesapeake Technology, Inc. (CTI) SonarWeb software to produce an interactive version of the profile that allows the user to obtain a geographic location and depth from the profile for a curser position. This information is displayed in the status bar of the browser. Warning! The only supported web browsers that properly display all features of the interactive profiles are Internet Explorer 6 for Windows and Firefox 1.5 for all platforms. For all browsers, the status bar and JavaScript must be enabled. Firefox also requires "Change status bar text" to be checked under Advanced JavaScript Options. Cautionother browsers may result in spurious or no information given in the status window. Firefox may be downloaded at http://www.mozilla.org/products/firefox.
  1. How might this data set be cited?
    Calderon, Karynna, Dadisman, Shawn V., Yobbi, Dann K., McBride, W. Scott, Flocks, James G., and Wiese, Dana S., 2005, Archive of Digital Boomer Seismic Reflection Data Collected During USGS Field Activity 04SGI01 in the Withlacoochee River of West-Central Florida, March 2004: U.S. Geological Survey Data Series 119, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -82.457496
    East_Bounding_Coordinate: -82.168435
    North_Bounding_Coordinate: 29.043365
    South_Bounding_Coordinate: 28.519395
  3. What does it look like?
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/all.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected during USGS Field Activity 04SGI01. This map was created at a scale of 1:275,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_a.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area A (refer to Area A of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_b.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area B (refer to Area B of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_c.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area C (refer to Area C of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_d.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area D (refer to Area D of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_e.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area E (refer to Area E of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_f.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area F (refer to Area F of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_g.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area G (refer to Area G of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. Refer to the Lineage section below for the trackline map creation process.
    http://pubs.usgs.gov/ds/2007/119/maps/cruisenav/area_h.jpg (JPEG)
    Trackline map of digital boomer seismic reflection data collected in Area H (refer to Area H of the full survey area map) during USGS Field Activity 04SGI01. This map was created at a scale of 1:50,000. 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: 01-Mar-2004
    Ending_Date: 05-Mar-2004
    Currentness_Reference:
    Data collection interval
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section
  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 UTMs) for each shot are provided as ASCII text files, along with the date and time (UTC) 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 0.000009. Longitudes are given to the nearest 0.000009. 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.
      The flattening of the ellipsoid used is 1/298.257.
  7. How does the data set describe geographic features?
    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 range in size from 1.6 KB to 98.4 MB.
    Entity_and_Attribute_Overview:
    Graphic image file: Printable profiles are GIF images that range in size from 96 KB to 2.6 MB. Interactive profiles are HTML pages that range in size from 15 to 364 KB. Accompanying JPEG images range in size from 160 KB to 10.9 MB. Line navigation maps are JPEG images that range in size from 60 to 219 KB. Trackline maps, which range in size from 88 to 137 KB, are JPEG images that contain links to the seismic profiles and line navigation maps.
    Entity_and_Attribute_Overview:
    Navigation file: Navigation files are available as ASCII text files. Raw navigation files measure 4-254 KB. Edited navigation files measure 2.2-3.9 MB, and edited 500-shot-interval location files measure 14.2-33.7 KB.
    Entity_and_Attribute_Overview:
    GIS file: The GIS project used to create the trackline maps is provided as a zip file composed of map documents, shapefiles, and metadata. The map documents range in size from 506 to 901 KB, and the shapefiles range in size from 2.31 KB to 54.8 MB.
    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, n. 2, p. 344-352. Also available online at: <http://www.seg.org/publications/tech-stand>.
    Entity_and_Attribute_Detail_Citation:
    Zihlman, F.N., 1992, DUMPSEGY V1.0: A program to examine the contents of SEG-Y disk-image seismic data: U.S. Geological Survey Open-File Report 92-590, 28 p.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karynna Calderon
    • Shawn V. Dadisman
    • Dann K. Yobbi
    • W. Scott McBride
    • James G. Flocks
    • Dana S. Wiese
  2. Who also contributed to the data set?
    Funding for this study was provided by the Federal-State Cooperative Water Program and the USGS Coastal and Marine Geology Program. This document was improved by the reviews of T.J. Smith and E.A. Shinn of the USGS in St. Petersburg, Florida.
  3. To whom should users address questions about the data?
    Dann K. Yobbi
    U.S. Geological Survey
    Hydrologist
    10500 University Center Dr., Suite 205
    Tampa, FL
    USA

    (813) 975-8620, ext. 164 (voice)
    dyobbi@usgs.gov

Why was the data set created?

The data archived here were collected as part of a study to evaluate the connection between the Upper Floridan aquifer and the Withlacoochee River. This study is part of the USGS Surface Groundwater Interactions (SGI) Project. For further information about the study, please contact Dann Yobbi at dyobbi@usgs.gov.

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: The original trace files for lines 04b04, 04b10, 04b16, 04b20, and 04b27 were divided into two trace files each (e.g., 04b04 became 04b04a and 04b04b) because the original total number of traces exceeded the maximum allowed by the processing software. The SEG-Y data for all lines were then processed with Seismic Unix software to produce GIF images of the seismic profiles included in this report. A representative boomer processing sequence consisted of: 1) Bandpass filter: 300-500-2500-3000 Hz, 2) Automatic gain control, 3) Postscript display, and 4) Conversion of Postscript image to a GIF image. The processed SEG-Y data were then exported to CTI SonarWeb software to produce an interactive version of each profile that allows the user to obtain a geographic location and depth from the profile for a cursor position. Refer to the Supplemental Information section above for details on how to use the interactive profiles.
    Date: 2004 (process 2 of 6)
    Navigation processing: Shotpoint navigation files and 500-shot-interval location files were extracted from the trace headers of each line using Seismic Unix software and edited to remove or correct spurious data points and fix incorrectly recorded dates. The navigation files were then processed with PROJ.4 software (<http://www.remotesensing.org/proj>) to generate latitude and longitude from UTMs and reformatted for use with Environmental Systems Research Institute (ESRI) ArcView GIS software. Refer to the Attribute Accuracy Report above for information about UTM zones recorded for this field activity.
    Date: 2004 (process 3 of 6)
    Trackline map creation: The trackline maps provided in this archive were created using ESRI ArcView 3.3 and ArcGIS 8.3 software, exported to Adobe Illustrator for further editing, and saved in JPEG format. The maps are in geographic coordinates, NAD83 (unprojected). The cities layer is an ESRI data set. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The hydrography layers are Southwest Florida Water Management District data sets. The USGS is the originator of all other layers. A map of trackline navigation for each seismic profile was also produced with CTI SonarWeb software.
    Date: 2004 (process 4 of 6)
    Archive preparation: In addition to the process steps described above, the following steps were taken to produce this archive: the handwritten FACS logs and observer's logbook 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 seismic reflection 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. All data were collected in UTM Zone 17; however, equipment was incorrectly set to UTM Zone 18 for lines 04b01-04b19 during data collection. Each data set was processed with respect to the UTM reference zone it was created in.
  2. How accurate are the geographic locations?
    As the seismic reflection data were acquired, the position of the vessel was continuously determined by a CSI Wireless DGPS Max DGPS receiver, which is accurate within 1 m if WAAS is available, or 3-5 m otherwise. Positions were recorded and written to the trace headers in UTMs about every 1 s. The navigation files, trackline maps, line navigation maps, and interactive profiles have not been corrected to reflect the varying (approximately 1-15 m) offset between the boomer midpoint and GPS antenna. For this measurement, see the acquisition geometry descriptions recorded in figure 1, the science logbook, and the handwritten FACS logs included with this archive (Data Series 119). Refer to the Attribute Accuracy Report above for information about UTM zones recorded for this field activity.
  3. How accurate are the heights or depths?
    Boomer data are relative to water 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 digital data were collected for line 04b29. Navigation is missing for shots 15,896-16,014 of line 04b11, the first 159 shots of line 04b16a, and the first 838 shots of line 04b22. 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.
  5. How consistent are the relationships among the observations, including topology?
    This data set is from one field activity with consistent instrument calibrations. However, acquisition geometry changed throughout this field activity. For more information about the acquisition geometry, refer to figure 1, the science logbook, and the handwritten FACS logs included with this archive (Data Series 119). Refer to the Attribute Accuracy Report above for details about UTM zones recorded for this field activity.

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 U.S. Geological Survey requests to be acknowledged as the originator of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Shawn Dadisman
    U.S. Geological Survey
    Geologist
    600 4th St. S.
    St. Petersburg, FL
    USA

    (727) 803-8747, ext. 3029 (voice)
    sdadisman@usgs.gov
    Contact_Instructions:
    Data may be available on-line only by special arrangement with the distributor above.
  2. What's the catalog number I need to order this data set? U.S. Geological Survey Data Series 119
  3. What legal disclaimers am I supposed to read?
    This DVD publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein 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. Although all data and software published on this DVD have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.
  4. How can I download or order the data?
    • Availability in digital form:
      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 Size: 1730
      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 ArcGIS 8.3 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>). in format map document, shapefile, metadata Size: 46.3
      Network links: https://pubs.usgs.gov/ds/2007/119/software/arc/arc.zip
      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 SEGY data download Size: 1730
      Network links: https://cmgds.marine.usgs.gov/data/04sgi01/boomer/
    • Cost to order the data: Prices vary.

    • 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:
Karynna Calderon
CSC, contracted to USGS
Geographer
600 4th St. South
St. Petersburg, FL
USA

(727) 803-8747, ext. 3143 (voice)
kcalderon@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-119metadata.faq.html>
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