Cape Canaveral, Florida, seismic chirp collected in 2016 by Coastal Carolina University

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Frequently anticipated questions:


What does this data set describe?

Title:
Cape Canaveral, Florida, seismic chirp collected in 2016 by Coastal Carolina University
Abstract:
A geophysical survey was conducted offshore Cape Canaveral, Florida by Coastal Carolina University offshore of Cape Canaveral, Florida using high-resolution chirp sub-bottom, multibeam bathymetry and side scan sonar (SSS) systems on June 13, 14, 16, and 17 of 2016. This USGS data release includes the resulting processed elevation point data (xyz), an interpolated digital elevation model (DEM), with processed backscatter, side scan sonar, and seismic chirp data.
Supplemental_Information:
The naming convention used for each subbottom line is as follows: CC##, where '##' are the last two digits of the track line number. The seismic source utilized during the Coastal Carolina University survey consisted of an EdgeTech 512i chirp towfish running DiscoverSB v. 4.09 acquisition software and towed about 2 meters (m) below the surface, while being floated on poly balls approximately 20 m behind the vessel. The Global Positioning System (GPS) antenna was located approximately 5.5 m above the water surface and approximately 13 m fore of the stern of the vessel. The data were acquired using a frequency sweep of 2 to 12 kilohertz (kHz), a 46 kHz sample frequency, a 20 milliseconds (ms) sweep length, and an original record length time window of 0-0.15 seconds The survey speed ranged from 4.5 to 5 knots. The binary portion of the unprocessed seismic data is stored in the Society of Exploration Geophysicists SEG Y rev. 0 (Barry and others, 1975), IEEE floating format, which is a standard digital format that can be read and manipulated by most seismic processing software packages; the first 3,200 bytes of the file header are in in American Standard Code for Information Interchange (ASCII) format instead of Extended Binary Coded Decimal Interchange Code (EBCDIC) format. The SEG Y formatted trace files have a .sgy extension. The SEG Y files may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2010). Also provided are printable Joint Photographic Experts Group (JPG) images of each profile. Note, file CC38.jpg doesn't exist as it is a very small file (27 traces, in a 309 KB file). The line may have been terminated for acquisition issues.
  1. How might this data set be cited?
    Buster, Noreen A., Miselis, Jennifer L., Okano, Shinobu, Gayes, Paul T., and Hill, Jenna C., 20170717, Cape Canaveral, Florida, seismic chirp collected in 2016 by Coastal Carolina University: U.S. Geological Survey Data Release doi:10.5066/F7833Q8J.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -80.619468
    East_Bounding_Coordinate: -80.438027
    North_Bounding_Coordinate: 28.672442
    South_Bounding_Coordinate: 28.382548
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 13-Jun-2016
    Ending_Date: 17-Jun-2016
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: multimedia presentation
  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):
      • string (55)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 17
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -81.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000000002220024164500956
      Ordinates (y-coordinates) are specified to the nearest 0.000000002220024164500956
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum 1988
      Altitude_Resolution: 0.0001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method: Attribute values
  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)
    • Noreen A. Buster
    • Jennifer L. Miselis
    • Shinobu Okano
    • Paul T. Gayes
    • Jenna C. Hill
  2. Who also contributed to the data set?
    U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
  3. To whom should users address questions about the data?
    Noreen A. Buster
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL
    USA

    (727)502-8114 (voice)
    nbuster@usgs.gov

Why was the data set created?

The purpose of the survey was to collect geophysical data in the shallow water (2-20 meters [m] water depth) off of Cape Canaveral, Florida, to better understand the linkages between geologic variability and the evolution and resiliency of the coastal system. Data were collected during USGS field activity number (FAN) 2016-342-FA. Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, http://cmgds.marine.usgs.gov/fan_info.php?fan=2016-342-FA.

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: 19-Jul-2016 (process 1 of 3)
    The SEG Y data were acquired with an Edgetech 512i towfish running Edgetech DiscoverSB 4.09 acquisition software and towed 2 meters (m) below the surface floated on poly balls approximately 20 m behind the vessel. The data were acquired using a frequency sweep of 2 to 12 kilohertz (kHz), a 46 kHz sample frequency, a 20 ms sweep length, and an original record length time window of 0-0.15 seconds The survey speed ranged from 4.5 to 5 knots. Person who carried out this activity:
    Center for Marine and Wetland Studies
    Attn: Paul Gayes
    Director
    190 Allied Dr.
    Conway, SC
    US

    843-349-4015 (voice)
    ptgayes@coastal.edu
    Date: 19-Jul-2016 (process 2 of 3)
    The SEG Y data were processed with Seismic Unix release 44 and SIOSEIS version 2015.4.2. The data were heave corrected using a running average swell filter, muted to the seafloor and a time-varying gain was applied. Products include SEG Y files and .jpg images of the seismic data. Person who carried out this activity:
    Center for Marine and Wetland Studies
    Attn: Paul Gayes
    Director
    190 Allied Dr.
    Conway, SC
    US

    843-349-4015 (voice)
    ptgayes@coastal.edu
    Date: 19-Jul-2016 (process 3 of 3)
    A trackline file was created from the navigation associated with seismic acquisition. Person who carried out this activity:
    Center for Marine and Wetland Studies
    Attn: Paul Gayes
    Director
    190 Allied Dr.
    Conway, SC
    US

    843-349-4015 (voice)
    ptgayes@coastal.edu
    Data sources produced in this process:
    • Canaveral_CCU2016_Tracklines_NAD83.shp
  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 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?
    The trackline position data were recorded using HYPACK (2014) hydrographic acquisition and processing software.
  3. How accurate are the heights or depths?
    These data are not to be used for bathymetry. Two-way travel (TWT) times shown on the printable profile images are relative to the chirp towfish position, not to the sea surface.
  4. Where are the gaps in the data? What is missing?
    These data are collected along two-dimensional (2-D) tracklines and are therefore inherently incomplete.
  5. How consistent are the relationships among the observations, including topology?
    This dataset is from one field activity with consistent instrument calibrations.

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. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Noreen A. Buster
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL
    USA

    (727)502-8114 (voice)
    nbuster@usgs.gov
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product 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?

Who wrote the metadata?

Dates:
Last modified: 17-Jul-2017
Metadata author:
Noreen A. Buster
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Geologist
600 4th Street South
St. Petersburg, FL
USA

(727) 502-8000 (voice)
nbuster@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Canaveral_CCU2016_Chirp_metadata.faq.html>
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