Tracklines of multichannel boomer seismic reflection data collected by the U.S. Geological Survey in Vineyard Sound, MA, 2011 (Esri polyline shapefile, Geographic WGS 84, 2010-100-FA_Boomer_tracklines.shp)

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set 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?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   U.S. Geological Survey, 2014, Tracklines of multichannel boomer seismic reflection data collected by the U.S. Geological Survey in Vineyard Sound, MA, 2011 (Esri polyline shapefile, Geographic WGS 84, 2010-100-FA_Boomer_tracklines.shp): Open-File Report 2013-1020, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

   Online Links:

   • https://doi.org/10.3133/ofr20131020
   • https://pubs.usgs.gov/of/2013/1020/GIS_catalog/tracklines/2010-100-FA_Boomertracks.zip

   This is part of the following larger work.
   Pendleton, Elizabeth A., Andrews, Brian D., Danforth, William W., and Foster, David S., 2013, High-resolution geophysical data collected aboard the U.S. Geological Survey research vessel Rafael to supplement existing datasets from Buzzards Bay and Vineyard Sound, Massachusetts: Open-File Report 2013-1020, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.3133/ofr20131020
   • https://pubs.usgs.gov/of/2013/1020/

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -70.801656
   East_Bounding_Coordinate: -70.598799
   North_Bounding_Coordinate: 41.495079
   South_Bounding_Coordinate: 41.392488
   

3. What does it look like?

   https://pubs.usgs.gov/of/2013/1020/GIS_catalog/tracklines/2010-100-FA_Boomer_tracklines.png (PNG)

   PNG of multichannel boomer seismic reflection navigation lines

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

   Calendar_Date: 06-Jan-2011

   Currentness_Reference:

   ground condition

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 (8751)
   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?

   2010-100-FA_Boomer_tracklines

   Tracklines for seismic profiles (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.

   Line

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

   Image

   Name of seismic profile PNG image used as hyperlink (Source: U.S. Geological Survey) string

   Year

   Year seismic data were collected (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2011
   Maximum:	2011
   Units:	year
   Resolution:	1

   Day

   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:	6
   Maximum:	6
   Units:	day
   Resolution:	1

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • U.S. Geological Survey
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   David S. 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

Why was the data set created?

How was the data set created?

1. From what previous works were the data drawn?

   USGS (source 1 of 1)

   Information unavailable from original metadata - assumed USGS, unknown, Information unavailable from original metadata.

   Type_of_Source_Media: disc
   Source_Contribution:

   Approximately 21 km of high-resolution multichannel boomer seismic-reflection profiles were collected. The Applied Acoustics boomer source was towed on the starboard side of the RV Rafael, 10 meters aft of the GPS antenna, and was fired at a power level of 100 joules at 1-second intervals with trace lengths of 250 milliseconds and 1000 samples per trace. The Geometrics GeoEel, eight-channel liquid filled digital streamer was towed from the port side of the vessel, and the center of the first channel of the active section was 22 meters aft of the boomer source. The streamer had a group interval of 3.125 meters connected to Geometrics Streamer Power Supply Unit (SPSU). Data acquired in Geometrics SEG-D format on Windows PC controller system using Geometrics CNT-1 software. The sample interval was 0.25 ms.

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

   Date: 20-Jan-2011 (process 1 of 8)

   A SIOSEIS seismic processing software script was used as follows: The raw SEG-D shot files were read with the process SEGDDIN specifying geometrics format; for lines L1 and L2, the process HEADER was used to correct time of day because of random incorrect values of time and position recorded in the header (correct time in the header was needed for the next process); the process GEOM was used to describe the shot and streamer geometries and to calculate the reflection point (CDP) numbers used to gather (sort traces by CDP) the seismic line. Process GEOM was used to set the shot-receiver distance into the trace header of every trace. For lines L1 and L2, GEOM type 6 was specified, which computes a distance from last shot (DFLS) for each shot based on the corrected shot time in the header and the navigation from an ASCII file containing time and position. The ASCII shot navigation file was derived from the HYPACK navigation data. Geom type 9 was specified for line L3, which calculates DFLS based on position in the SEG-D header that was verified to be correct; a normal move out (NMO) applied a travel time correction to each trace based on offset and a velocity of 1500 m/s; process GATHER was used to sort the shot order traces in to traces sorted by the CDP numbers computed by the process GEOM; lastly, the CDP trace gathers were written with the process in SEG-Y rev. 1, IEEE floating point format. Person who carried out this activity:
   

   David S. Foster

   U.S. Geological Suvrvey

   Geologist

   384 Woods Hole Road

   Woods Hole, MA
   

   USA

   508-548-8700 x2271 (voice)

   508-457-2271 (FAX)

   dfoster@usgs.gov

   Date: 20-Jan-2011 (process 2 of 8)

   A SIOSEIS script was used to stack the CDP gathers, apply a bandpass filter and automatic gain control. The process DISKIN read the CDP sorted SEG-Y file and renumbered CDP starting at one and incremented CDP number by one. The process STACK was used to sum traces, compute the average amplitude for each trace sample, and write the computed samples to one trace. The trace header values of the first trace in the gather were used for the stacked trace. The process FILTER applied a zero-phase bandpass frequency domain filter between 600 and 2000 Hz with a slope of 48 decibel per octave slope. The process AGC applied an automatic gain control (AGC) with a window length of 5 ms. The computed multiplier for each AGC window was reduced by fifty percent. Lastly, the processed stacked traces were written to disk with the process DISKOX in SEG-Y rev. 1, IEEE floating point format. Person who carried out this activity:
   

   David S. 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: 24-Jan-2011 (process 3 of 8)

   A Seismic Unix script was used to read the trace headers of the stacked SEG-Y files and write CDP, source X and Y, year, day, hour minute, seconds only where the original channel number was equal to one (the channel closest to the source). Some CDP gathers did not contain a trace with channel one in the header and were eliminated. The coordinates represent the position of the GPS antenna, which has a constant offset of 10 meters to the source. The source to receiver offset was 22 meters. Half the distance between source and receiver represents the location of the common reflection point. A layback correction of 21 meters was applied to the navigation using an AWK script written by Wayne Baldwin, USGS. An AWK script was used to format the trace navigation with corrected layback positions in a comma-delimited file. Person who carried out this activity:
   

   David S. 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: 09-Apr-2013 (process 4 of 8)

   Text files created in the previous step were concatenated into a comma-delimited text file, then imported into ArcMap (version 9.3) using 'Create Feature Class from XY Table' and saved as points (UTM Zone 19, WGS84) in the Esri shapefile format. Person who carried out this activity:
   

   David S. 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: 09-Apr-2013 (process 5 of 8)

   The shapefile created in the previous step was converted from points to polylines using VAC Extras Points to Line v2. The 'Line' field was used to define which points were used to generate each polyline feature. Finally, ArcToolbox (9.3) was used to reproject from UTM projection to Geographic coordinate system. Person who carried out this activity:
   

   David S. 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: 05-Oct-2017 (process 6 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.). Added the DOI link in the Identification section - both as the first link and as part of the Larger Work citation. Fixed the publication date and also the Larger Work citation title to match what is available online. Updated the link to the project page in the abstract as well as the field activity links. The source information was incomplete and had to be modified to meet the standard. Fixed a link in the distribution 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: 20-Jul-2018 (process 7 of 8)

   USGS Thesaurus keywords added to the keyword section. 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?
   Henkart, Paul, 2007, SIOSEIS: Scripps Institution of Oceanography, University of California - San Diego, LaJolla, CA.

   Online Links:

   • http://sioseis.ucsd.edu/index.html

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

   Online Links:

   • http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf

   Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Digital Field Tape Format Standards -- SEG-D: Society of Exploration Geophysicists, Tulsa, OK.

   Online Links:

   • http://www.seg.org/documents/10161/77915/seg_d_rev0.pdf

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

   Online Links:

   • http://www.cwp.mines.edu/cwpcodes/index.html

   Andrews, B.D., Ackerman, S.D., Baldwin, W.E., Foster, D.S., and Schwab, W.C., 2013, High-Resolution Geophysical Data From the Inner Continental Shelf at Vineyard Sound, Massachusetts: Open-File Report 2012-1006, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://pubs.usgs.gov/of/2012/1006/

   Ackerman, S.D., Andrews, B.D., Foster, D.S., Baldwin, W.E., and Schwab, W.C., 2013, High-Resolution Geophysical Data from the Inner Continental Shelf: Buzzards Bay, Massachusetts: Open-File Report 2012-1002, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://pubs.usgs.gov/of/2012/1002/

   Pendleton, E.A., Twichell, D.C., Foster, D.S., Worley, C.R., Irwin, B.J., and Danforth, W.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, Reston, VA.

   Online Links:

   • https://pubs.usgs.gov/of/2011/1184/

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 navigation for these data were acquired with a 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. All DGPS data are referenced to WGS84. The Geometrics CNT-1 acquisition software logged the navigation coordinates (in arcseconds) to individual trace headers. Layback distance between the CSI antenna and the source and receiver were calculated in postprocessing. The resulting horizontal accuracy is assumed to be +/- 2 m; however, inaccuracies likely exceed this value due to uncertainty of azimuths calculated in the layback correction.
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   Information unavailable from original metadata.
5. How consistent are the relationships among the observations, including topology?
   Processed seismic CDP navigation data were processed for display in a GIS. Quality control was conducted during processing. File naming is Lx.png, where x is the survey line number.

How can someone get a copy of the data set?

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

   U.S. Geological Survey

   Geologist

   384 Woods Hole Road

   Woods Hole, MA
   

   USA

   508-548-8700 x2259 (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?
   • Availability in digital form:

     Data format:	This WinZip (v 14.5) file contains a shapefile of seismic tracklines as well as associated metadata. in format Shapefile (version ArcGIS 9.3) Shapefile Size: 1
     Network links:	https://pubs.usgs.gov/of/2013/1020/GIS_catalog/tracklines/2010-100-FA_Boomertracks.zip https://pubs.usgs.gov/of/2013/1020/html/ofr2013-1020_GIS_catalog.html

   • Cost to order the data: none

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) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the shapefile. 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: 18-Mar-2024

Metadata author:

David S. Foster

U.S. Geological Survey

Geologist

384 Woods Hole Road

Woods Hole, MA

USA

508-548-8700 x2271 (voice)

508-457-2310 (FAX)

whsc_data_contact@usgs.gov

Contact_Instructions:

The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)