High-Resolution Seismic-Reflection Chirp Profiles in SEG-Y and JPEG Formats From Cruise RAFA08034 off Edgartown, Massachusetts (08034_KELPROFILES)

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Frequently anticipated questions:


What does this data set describe?

Title:
High-Resolution Seismic-Reflection Chirp Profiles in SEG-Y and JPEG Formats From Cruise RAFA08034 off Edgartown, Massachusetts (08034_KELPROFILES)
Abstract:
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Massachusetts Office of Coastal Zone Management (MA CZM), is producing detailed geologic maps of the coastal sea floor. Imagery, originally collected by NOAA for charting purposes, provides a fundamental framework for research and management activities along this part of the Massachusetts coastline, shows the composition and terrain of the seabed, and provides information on sediment transport and benthic habitat. Interpretive data layers were derived from multibeam echo-sounder and sidescan-sonar data collected in the vicinity of Edgartown Harbor, Massachusetts. During August 2008 seismic-reflection profiles (Boomer and Chirp) were acquired, and during September 2008 bottom photographs and surficial sediment data were acquired as part of two ground-truth reconnaissance surveys.
Supplemental_Information:
For more information on the seismic surveys see https://cmgds.marine.usgs.gov/fan_info.php?fan=2008-034-FA
These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.
  1. How might this data set be cited?
    Poppe, Larry, 2009, High-Resolution Seismic-Reflection Chirp Profiles in SEG-Y and JPEG Formats From Cruise RAFA08034 off Edgartown, Massachusetts (08034_KELPROFILES): Open-File Report 2009-1001, 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.

    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Moser, M.S., and Glomb, K.A., 2010, Geological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts: Open-File Report 2009-1001, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.550201
    East_Bounding_Coordinate: -70.432541
    North_Bounding_Coordinate: 41.444981
    South_Bounding_Coordinate: 41.385845
  3. What does it look like?
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0003_2008_232_0951_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0004_2008_232_1020_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0005_2008_232_1029_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0006_2008_232_1053_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0007_2008_232_1110_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0008_2008_232_1146_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0009_2008_232_1228_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0010_2008_232_1247_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0011_2008_232_1303_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0012_2008_232_1330_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0013_2008_232_1339_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0014_2008_232_1439_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0015_2008_232_1449_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0016_2008_233_0923_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0017_2008_233_0940_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    https://pubs.usgs.gov/of/2009/1001/data/seismic/kel/gif_files/0018_2008_233_0950_3.5kHz.gif (GIF)
    Browse graphic showing chirp high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 19-Aug-2008
    Ending_Date: 20-Aug-2008
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: SEG-Y and JPEG
  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.
    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 0.000003. Longitudes are given to the nearest 0.000003. 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.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.001
      Depth_Distance_Units: milliseconds
      Depth_Encoding_Method: Implicit coordinate
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    This data set includes 3.5-kHz Chirp seismic-reflection data in SEG-Y and JPEG formats collected along 17 lines in the vicinity of Edgartown, offshore Massachusetts. The seismic data were collected during USGS survey 08034, conducted August 18-20, 2008. Each profile is available as a binary file in Society of Exploration Geophysicists SEG-Y rev 1 format and JPEG image format. A SEG-Y file consists of 1) a 3200-byte file identification record of EBCDIC encoded general information; 2) a 400-byte binary record with information such as sample rate and record length specific to the data set; and 3) multiple records, one seismic reflection trace per record. Each trace record is preceded by a 240-byte "trace header" containing information such as trace number and acquisition day and time specific to each trace. The trace data are represented as a time series of unitless 32-bit IEEE real numbers proportional to the reflection coefficient. The SEG-Y file is useful only if you have access to specialized software designed to process and display seismic reflection data. **In the original metadata, the Geographic_Coordinate_Units were listed as seconds of arc, which violates the standard. The assumption is that seconds of arc refers to information in the SEG-Y header.
    Entity_and_Attribute_Detail_Citation: http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Larry Poppe
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@usgs.gov

Why was the data set created?

To release the Chirp seismic profiles collected to ground-truth acoustic data (single-beam and multibeam bathymetry and sidescan sonar imagery) collected during NOAA hydrographic survey H11346. The Chirp data were collected to interpret the shallower stratigraphy beneath Edgartown Harbor.

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: 20-Aug-2008 (process 1 of 8)
    High-resolution 3.5 kHz Chirp data were collected August 19-20 aboard the Research Vessel Rafael. The Chirp data were acquired digitally along 16 lines totaling approximately 56.1 km with a Knudsen Engineering Limited (KEL) Chirp 3200 shallow water system and KEL Sounder Suite software. The Chirp trace data recorded with a ping rate of 0.5 seconds for 66 ms with a sample rate of 0.048 ms in standard SEG-Y format. Person who carried out this activity:
    David Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov
    Date: 10-Dec-2008 (process 2 of 8)
    The raw SEG-Y data were read into Promax R2003 processing software. Heave compensation data from the Teledyne TSS sensor (mounted on the transducer sidemount pole) were extracted from the SEG-Y headers and were used to apply a static shift to the trace data. A topmute above the seas floor was digitized and applied. An AGC with a window length of 5 ms was applied. The processed data were written to a new SEG-Y file. Person who carried out this activity:
    David Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov
    Date: 10-Dec-2008 (process 3 of 8)
    A Unix shell script was run that used Seismic Unix v4.0 to read the SEG-Y files and plot the data as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm at a scale of 4.16 ms per inch and 100 traces per inch. The Postscript images were then converted to JPEG format with Imagemagick 5.5.6 Person who carried out this activity:
    David Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@noaa.gov
    Date: 07-Feb-2017 (process 4 of 8)
    Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Attempted to modify http to https where appropriate. Added an online linke for a cross-reference. The source information only contained a date, so was deleted. The geographic coordinate units were listed as seconds of arc, which violates the standard. The value was changed to decimal degrees. The assumption is that seconds of arc refers to information in the SEG-Y header. Added a digital form so that the JPEG and SEG-Y each had a section. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. 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: 03-Dec-2017 (process 5 of 8)
    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: 04-Dec-2017 (process 6 of 8)
    Supplemental information was added, as well as more information in the distribution to provide another source of where to get the SEG-Y data. 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: 18-Nov-2019 (process 7 of 8)
    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 8 of 8)
    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?
    O'Hara, C.J., and Oldale, R.N., 1987, Maps showing the geology, shallow structure, and bedform morphology of Nantucket Sound, Massachusetts: Miscellaneous Field Studies Map MF-1911, U.S. Geological Survey, Reston, VA.

    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?
    Horizontal_Positional_Accuracy_Report: Navigation was by DGPS; positional accuracy to less than 10 m. The 3.5 kHz transducer was mounted on a pole on the starboard side of the RV Rafael 0.6 m below the water surface.
  3. How accurate are the heights or depths?
    The vertical position was local sea level and there have been no corrections to a datum or for tidal variations.
  4. Where are the gaps in the data? What is missing?
    All available profile data along seismic acquisition lines collected during the RV Rafael cruise 08034 is included in this data set except for the first two files were omitted from the processing. These files only contain a few seconds of data.
  5. How consistent are the relationships among the observations, including topology?
    No additional checks for consistency were performed on this data.

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 (USGS) as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@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 the National Oceanic and Atmospheric Administration (NOAA), 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 or NOAA 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?
    Use of SEG-Y data requires specialized software capable of reading SEG-Y standard files. The user must have software capable of viewing standard JPEG files.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
David Foster
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA
USA

508-548-8700 x2271 (voice)
508-457-2310 (FAX)
dfoster@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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