JPEG formatted images of EdgeTech SB-512i, EdgeTech SB-424, and Knudsen 3200 chirp seismic-reflection profiles collected by the U.S. Geological Survey offshore of Massachusetts within northern Cape Cod Bay.

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Frequently-anticipated questions:

What does this data set describe?

Title:
JPEG formatted images of EdgeTech SB-512i, EdgeTech SB-424, and Knudsen 3200 chirp seismic-reflection profiles collected by the U.S. Geological Survey offshore of Massachusetts within northern Cape Cod Bay.
Abstract:
These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Science Center (WHSC). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of sea-floor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters of Massachusetts, primarily in depths between 3 and 30 meters. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>). This spatial dataset is from the study area located in northern Cape Cod Bay, and consists of high-resolution geophysics (bathymetry, backscatter intensity, and seismic reflection) and ground validation (sediment samples, video tracklines, and bottom photographs). The data were collected during five separate surveys conducted between 2003 and 2008 (USGS-WHSC surveys 06012 in 2006; 07001, 07002, and 07003 in 2007; and 08002 in 2008) and cover more than 480 square kilometers of the inner continental shelf. More information about the individual USGS surveys that are were conducted as part of the northern Cape Cod Bay project can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage: 06012: <http://quashnet.er.usgs.gov/data/2006/06012/> 07001: <http://quashnet.er.usgs.gov/data/2007/07001/> 07003: <http://quashnet.er.usgs.gov/data/2007/07003/> 07002: <http://quashnet.er.usgs.gov/data/2007/07002/> 08002: <http://quashnet.er.usgs.gov/data/2008/08002/>
  1. How should this data set be cited?

    U.S. Geological Survey, 2009, JPEG formatted images of EdgeTech SB-512i, EdgeTech SB-424, and Knudsen 3200 chirp seismic-reflection profiles collected by the U.S. Geological Survey offshore of Massachusetts within northern Cape Cod Bay.: USGS Open-File Report 2010-1006, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Barnhardt, Walter A. , 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Northern Cape Cod Bay, Massachusetts.: Open-File Report 2010-1006, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.643310
    East_Bounding_Coordinate: -70.112825
    North_Bounding_Coordinate: 42.093903
    South_Bounding_Coordinate: 41.929198

  3. What does it look like?

    <https://pubs.usgs.gov/of/2010/1006/GIS/browse_jpg/CCB_Seismic_JPEG.jpg> (JPEG)
    JPEG image of a chirp seismic-reflection profile

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 16-Aug-2006; 20070429; 20070725; 20080501
    Ending_Date: 23-Aug-2006; 20070503; 20070807; 20080507
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: raster digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions, type pixel

    2. What coordinate system is used to represent geographic features?

  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Wayne Baldwin
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

Why was the data set created?

JPEG images of each seismic profile were generated in order to incorporate images of the seismic profiles into Geographic Information System (GIS) projects and data archives utilizing HTML. The JPEG images represent approximately 3270 km of EdgeTech SB-512i, EdgeTech SB-424, and Knudsen 3200 chirp seismic-reflection profiles collected within northern Cape Cod Bay. Each profile image is hotlinked to its corresponding trackline navigation contained within the ESRI polyline shapefile 'CCBay_SeismicTrackline.shp'. Even 500 shot index markers along the top of the JPEG images correlate to the positions of 500 shot intervals within the ESRI point shapefile 'CCBay_SeismicShot_500.shp'.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    Source_Contribution:
    Seismic-reflection data acquisition 06012: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz), which was mounted on a catamaran and towed astern of the R/V Megan T. Miller of Port Jefferson, NY. Edgetech J-Star seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the EdgeTech JSF format, and record GPS navigation coordinates to the JSF trace headers. Data were acquired using a 0.27-s shot rate, a 9-ms pulse length, and a 0.5 to 6 kHz frequency sweep. Recorded trace lengths were approximately 266 ms. Northwest-southeast oriented tracklines were spaced between 100 and 200 m apart.

    Seismic-reflection data acquisition 07001: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-424 towfish (4-24 kHz), which was mounted on a rigid pole on the starboard side of the R/V Rafael of Woods Hole, MA. Edgetech J-Star and Triton Imaging Inc. SB-Logger seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in EdgeTech JSF and SEG-Y Rev. 1 formats, respectively, and record GPS navigation coordinates to the JSF or SEG-Y trace headers. Data were acquired using a 0.25-s shot rate, a 10-ms pulse length, and a 4 to 16 kHz frequency sweep. Recorded trace lengths were approximately 250 ms. Northwest-southeast oriented tracklines were spaced between 75 and 100 m apart.

    Seismic-reflection data acquisition 07002: Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz), which was mounted on a catamaran and towed astern of the R/V Megan T. Miller of Port Jefferson, NY. Edgetech J-Star seismic acquisition software was used to control the Geo-Star topside unit, digitally log trace data in the EdgeTech JSF format, and record GPS navigation coordinates to the JSF trace headers. Data were acquired using a 0.25-s shot rate, a 5-ms pulse length, and a 0.5 to 8 kHz frequency sweep. Recorded trace lengths were approximately 250 ms. Northwest-southeast oriented tracklines were spaced between 100 m and 1 km apart, while northwest-southeast oriented tracklines were spaced between 1 and 3.5 km apart.

    Seismic-reflection data acquisition 08002: Chirp seismic data were collected using a dual frequency (3.5 and 200 kHz) Knudsen Engineering Limited Chirp 3200 system with transducers mounted on a rigid pole on the starboard side of the R/V Rafael of Woods Hole, MA. Knudsen SounderSuite seismic acquisition software was used to control the Chirp 3200 system, digitally log trace data in the SEG-Y Rev. 1 format, and record GPS navigation coordinates to the SEG-Y trace headers. Data were acquired using a 0.25 or 0.5-s shot rate, a 1 or 2-ms pulse length, and a peak frequency of 3.5 kHz. Recorded trace lengths were approximately 67 and 135 ms. Northwest-southeast oriented tracklines were spaced between 60 and 150 m apart.

  2. How were the data generated, processed, and modified?

    Date: Oct-2008 (process 1 of 3)
    A script was run that used SIOSEIS (version 2007.8) to predict and remove sea surface heave, and mute water column portions of SB-512i, SB-424, and Knudsen 3200 seismic traces by: 1)automatically picking the sea floor by identifying peak amplitudes within a vertical window; 2)smoothing sea floor picks using an along track filter approximating the period of sea surface heave (the filter window was set to use 46 traces); 3)creating a series of difference values between the raw and smoothed seafloor picks for each trace; 4)shifting traces up or down according to the difference values; and 5) muting each trace between time zero and the time of the smoothed sea floor pick, thus removing noise within the water column. Changes to the traces within each profile were saved to new "heave corrected" SEG-Y files, which were used for creation of JPEG browse images and digital interpretation.

    Person who carried out this activity:

    Wayne Baldwin
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

    Date: Oct-2008 (process 2 of 3)
    An AWK (no version) script was run that used Seismic Unix (version 4.1) to read the SEG-Y files and plot the data as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm. All images were created with a horizontal scale of 200 traces per inch. The profiles contain 80 milliseconds of Two-Way Travel Time within an 8-inch vertical window, yielding 10 milliseconds per inch. Postscript images were converted to JPEG format using ImageMagick (version 5.5.6).

    Person who carried out this activity:

    Wayne Baldwin
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

    Date: Oct-2008 (process 3 of 3)
    JPEG images were resized to enable quicker and easier downloading for online users of the Open-File Report using IrfanView (v4.23). The original JPEG images (found in the folders by survey ID in GIS\hyperlink_images\seisimage\) were resized to 75 percent the original pixel size and downsampled with a save quality of 80 percent. These downsampled and resized images are included in the zipped file CCBay_SeismicProfiles.zip (<https://pubs.usgs.gov/of/2010/1006/html/appendix1.html>).

    Person who carried out this activity:

    Wayne Baldwin
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

    Data sources used in this process:
    • Full sized JPEG images

    Data sources produced in this process:

    • Downsampled and resized JPEG images (same filenames)

  3. What similar or related data should the user be aware of?

    Stockwell, John, 2008, CWP/SU: Seismic Uni*x: Center for Wave Phenomena - Colorado School of Mines, Golden, CO.

    Online Links:

    Henkart, Paul, 2007, SIOSEIS: Scripps Institution of Oceanography, University of California - San Diego, LaJolla, CA.

    Online Links:

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

    Online Links:

    Barnhardt, Walter A. , Andrews, Brian D. , and Butman, Bradford, 2006, High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts: Open-File Report 2005-1293, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Ackerman, Seth D. , Butman, Bradford, Barnhardt, Walter A. , Danforth, William W. , and Crocker, James M. , 2006, High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Barnhardt, Walter A. , Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Hein, Christopher J. , 2009, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    Barnhardt, Walter A. , Ackerman, Seth D. , Andrews, Brian D. , and Baldwin, Wayne E. , 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.: Open-File Report 2009-1072, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    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?

    Field activities 06012 and 07002: The SB-0512i was mounted on a catamaran sled and towed at the sea surface approximately 30 - 40 m astern of the R/V Megan T. Miller. Position data were provided by a Global Positioning System (GPS) navigation receiver mounted on the catamaran, and data were transmitted to the acquisition computer on the vessel via a 2.4 GHz radio link. During some portions of field activity 06012, technical difficulties caused the GPS system mounted on the catamaran to malfunction. In these instances Real Time Kinematic (RTK) GPS navigation was obtained from a receiver mounted above the interferometric sonar head (This applies to files l99f2000 through l224f1000 acquired during Julian days 233 through 235). Layback positions, which account for the linear distance between the shipboard RTK-GPS receiver and the towed catamaran vehicle, were calculated trigonometrically during post-processing (see processing step 3 in the metadata for CCB_SeismicTrackline.shp included in this publication). While the vehicle mounted GPS antenna was operational, positional accuracy is assumed to be ± 10 m. While the vehicle mounted GPS was not operational, positional accuracy is assumed to be ± 20 m; increased uncertainty arises because layback calculations do not account for fish motion behind the vessel, which is caused by sea state and vessel speed induced changes in the angle and scope of the tow cable.

    Field activities 07001 and 08002: The SB-424 towfish (07001) and Chirp 3200 transducers (08002) were mounted on a rigid pole, approximately 1 and 0.5 m, respectively, below the sea surface on the starboard side of the R/V Rafael. Position data were provided by a RTK-GPS navigation receiver located directly above the interferometric sonar head that was mounted from the bow of the R/V Rafael. Athough the horizontal offsets between the seismic-reflection sources and the RTK-GPS navigation receiver were not corrected in the sonar setup, this distance was less than 3 m, and the resulting positional accuracy during each field activity is assumed to be ± 10 m.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Only the subsets of seismic-reflection data collected during field activities 06012 and 07001 that are within the northern Cape Cod Bay study area have been included in this raster dataset. Approximately 1920 km of additional seismic-reflection profiles collected north of Brant Rock, Massachusetts during these field activities were published in USGS Open-File Report 2009-1072 Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts (<https://pubs.usgs.gov/of/2009/1072/>).

  5. How consistent are the relationships among the observations, including topology?

    Processed seismic data were converted to JPEG format for ease of seismic trace display. Quality control was conducted during processing.

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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the source of this information.

  1. Who distributes the data set? (Distributor 1 of 1)

    Wayne Baldwin
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543
    USA

    508-548-8700 x2226 (voice)
    wbaldwin@usgs.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  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. Is there some other way to get the data?

    Digital copies of these chirp seismic data may also be obtained in the SEG-Y Rev. 1 standard format upon request. The data would be packaged on DVD, and contain the chirp-processed, envelope traces.

  6. What hardware or software do I need in order to use the data set?

    These data can be viewed with any JPEG image viewing software.

Who wrote the metadata?

Dates:
Last modified: 19-Aug-2010
Last Reviewed: 2009
Metadata author:
Wayne Baldwin
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

508-548-8700 x2226 (voice)
508-457-2310 (FAX)
wbaldwin@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.25 on Thu Sep 30 11:33:22 2010