2010-003-FA_Chirp424_500shot.shp - Shot point navigation at 500 shot intervals for EdgeTech SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center offshore of the Elizabeth Islands, MA, 2010 (ESRI point shapefile)

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Frequently-anticipated questions:

What does this data set describe?

Title:
2010-003-FA_Chirp424_500shot.shp - Shot point navigation at 500 shot intervals for EdgeTech SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center offshore of the Elizabeth Islands, MA, 2010 (ESRI point shapefile)
Abstract:
These data were collected under a cooperative agreement between the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center (WHCMSC). 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 seafloor 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 coastal Massachusetts, primarily in water depths of 2-30 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>). The data collected in this study area located around the western extent of the Elizabeth Islands includes high resolution bathymetry, acoustic-backscatter intensity, seismic-reflection, and navigation data. These data were collected during a nearshore cruise in September 2010 onboard the R/V Rafael using the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, an Edgetech 424 chirp subbottom profiling system, and 4 GPS antennae. More information about the cruise conducted as part of the project: Geologic Mapping of the Seafloor Offshore of Massachusetts can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage: <http://quashnet.er.usgs.gov/data/2010/10003/>
  1. How should this data set be cited?

    U.S. Geological Survey, 2012, 2010-003-FA_Chirp424_500shot.shp - Shot point navigation at 500 shot intervals for EdgeTech SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center offshore of the Elizabeth Islands, MA, 2010 (ESRI point shapefile): Open-File Report 2011-1184, 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.

    Pendleton, Elizabeth A. , Twichell, David C. , Foster, David S. , Worley, Charles R. , Irwin, Barry J. , and Danforth, William W. , 2012, High-Resolution Geophysical Data From the Sea Floor Surrounding the Western Elizabeth Islands, Massachusetts: Open-File Report 2011-1184, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.992374
    East_Bounding_Coordinate: -70.849060
    North_Bounding_Coordinate: 41.460852
    South_Bounding_Coordinate: 41.388525

  3. What does it look like?

    <https://pubs.usgs.gov/of/2011/1184/GIS_catalog/tracklines/shots.png> (PNG)
    Woods Hole Coastal and Marine Science Center EdgeTech SB-424 trackline navigation offshore of the Elizabeth Islands, MA

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

    Beginning_Date: 10-Sep-2010
    Ending_Date: 16-Sep-2010
    Currentness_Reference: Data were not collected on 20100915 due to weather conditions.

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

    Geospatial_Data_Presentation_Form: vector digital data

  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):

      • Entity point (1390)

    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 0.000001. Longitudes are given to the nearest 0.000001. 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.

  7. How does the data set describe geographic features?

    2010-003-FA_Chirp424_500shot
    Shot point navigation for seismic profiles at 500-shot interval (Source: U.S. Geological Survey)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    x
    Easting coordinate in UTM Zone 19 meters, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:333424.49
    Maximum:345485.62
    Units:meters
    Resolution:0.01

    y
    Northing coordinate in UTM Zone 19 meters, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:4583796.3
    Maximum:4591698.68
    Units:meters
    Resolution:0.01

    lon
    Longitude coordinate in decimal degrees, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:-70.9923759
    Maximum:-70.849061
    Units:decimal degrees
    Resolution:0.000001

    lat
    Latitude coordinate in decimal degrees, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:41.388525
    Maximum:41.46085
    Units:decimal degrees
    Resolution:0.000001

    line
    Name of seismic data file (Source: U.S. Geological Survey)

    Sequential line and file numbers used to distinguish tracklines

    shot
    shot number in the profile (Source: U.S. Geological Survey)

    Range of values
    Minimum:1
    Maximum:8967
    Units:shot number
    Resolution:1

    year
    Calendar year data were collected (Source: U.S. Geological Survey)

    ValueDefinition
    2010year

    JD
    Julian day data were collected (Julian day is the integer number representing the interval of time in days since January 1 of the year) (Source: U.S. Geological Survey)

    Range of values
    Minimum:253
    Maximum:259
    Units:day
    Resolution:1

    time
    Universal Coordinated Time of seismic shot (hh:mm:ss) (Source: U.S. Geological Survey)

    time

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?

    David C. Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2266 (voice)
    508-457-2310 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This dataset contains shot point navigation at even 500 shot intervals for approximately 253 km of EdgeTech SB-424 chirp seismic-reflection data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in 2010. The seismic-reflection data are used to define sub-surface stratigraphy offshore of the Elizabeth Islands in MA, and these navigation data can help spatially correlate the seismic-reflection profiles with other data in the GIS.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    U.S. Geological Survey.

    Type_of_Source_Media: disc
    Source_Contribution:
    Approximately 253 km of high-resolution chirp seismic-reflection profiles were collected using an EdgeTech 3100 portable sub-bottom system and SB-424 towfish (4-24 kHz) on the R/V Rafael of Woods Hole, MA. SonarWiz.MAP +SBP (version 4) acquisition software was used to control the Geo-Star topside unit and digitally log trace data in the Society of Exploration Geophysicists Y (SEG-Y), revision 1, standard format (Norris and Faichney, 2002). The SB-424 towfish was towed astern of the starboard side of the vessel. Navigation coordinates were obtained from a DGPS antenna mounted 3-m above the waterline on the interferometric sonar pole and logged to the SEG-Y trace headers. Data were acquired using a 4.0 to 24.0 kHz frequency sweep, a 10 millisecond pulse length, a 0.1667 second shot rate, a 23 microsecond sample interval, and a 130 millisecond record length. A total of 253 km of seismic data were collected.

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

    Date: 2010 (process 1 of 4)
    An executable C-shell script called on SIOSEIS (version 10.2.25) to: 1) read the raw SEG-Y data so that shot number begins at one and increments by one for each SEG-Y file; and, 2) write the shot renumbered data to new SEG-Y files.

    Person who carried out this activity:

    David S. Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: 2010 (process 2 of 4)
    An executable C-shell script called on Seismic Unix (version 4.1) to read the shot renumbered SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, including shot number, longitude, latitude, year, Julian day, and time of day (UTC) to ASCII text files for each survey line. The data were filtered using AWK (no version) to save records for the first and last shots, and shots at unique longitude/latitude positions in between (2010-003-FA_Chirp424_Uniquesht.csv). Geographic coordinates (WGS84) were converted to UTM zone 19 coordinates (WGS84) using Proj (version 4.6.0), and added to the text files in two new columns. Two lines (l12f1 and l13f1) did not have navigation recorded to the trace header due to generator malfunction on the R/V Rafael. Navigation for these two lines were created by extracting x,y values (CSI LGBX Pro acquired) from HYPACK and merging with shot point values based on time of day.

    Person who carried out this activity:

    David S. Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: Oct-2010 (process 3 of 4)
    An additional AWK filter was applied to each file containing all shot point records created in the previous step to extract trace header records containing the first shot, last shot, and shots evenly divisible by 500 for each survey line. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile portable network graphic (PNG) images, which are included in the 'GIS_catalog\seisimage\' directory. Lines l12f1,l13f1, l4f1, l5f1,l5f2, l5f2.001,l5f2.002, and l5f2.003 were processed seperately from the rest of the files, and therefore the navigation from these data were concatenated to the other navigation data. End shots had to be extracted individually and appended to the navigation text file.

    Person who carried out this activity:

    David S. Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: 2010 (process 4 of 4)
    Text files created in the previous step were concatenated into a comma-delimited text file, then imported into ArcMap (version 9.3) using 'Add XY data' and saved as points in the ESRI shapefile format. The shapefile was then projected from WGS84 UTM Zone 19N to Geographic WGS84.

    Person who carried out this activity:

    Elizabeth Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2259 (voice)
    508-457-2310 (FAX)
    ependleton@usgs.gov

  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:

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

    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?

    The SB-424 was towed from a starboard-side davit with 2-m of cable out on the R/V Rafael. The navigation for these data were acquired with an Communications Systems International (CSI), Inc. LGBX Pro Differential Global Positioning System (DGPS) receiver and an antenna mounted on the cabin of the R/V Rafael. Unless noted, all DGPS data are referenced to WGS84. The SonarWiz.MAP +SBP acquisition software logged the navigation coordinates (in arcseconds) to individual trace headers, but towfish layback and horizontal distance between the CSI antenna and the towfish was not accounted for. Based on horizontal offsets between the towfish and GPS receiver, and towfish motion behind the vessel, the resulting horizontal accuracy is assumed to be +/- 25 m.

  3. How accurate are the heights or depths?

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

    l8f3 and l26f1.001 had fewer than 50 shot points, so these lines were not included.

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

    Any spurious data points were removed during processing. File naming is generally lxfy. Where x is the survey line number and y is the file number along a given survey line. There are a few exceptions that resulted from autofile changing in SonarWiz.MAP +SBP. A few lines are named lxfy_, and a few others are lxfy_00z; where x and y are the same as above and z is the autofile change number.

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 originator of the dataset.

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

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@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. What hardware or software do I need in order to use the data set?

    This zip file contains data available in Environmental Systems Research Institute (ESRI) point shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: Oct-2010
Metadata author:
Elizabeth Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700x2259 (voice)
(508) 457-2310 (FAX)
ependleton@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 Fri Nov 18 14:47:51 2011