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Range of values | |
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Minimum: | 1 |
Maximum: | 1 |
Units: | shot |
Resolution: | 1 |
Range of values | |
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Minimum: | 2014 |
Maximum: | 2014 |
Units: | year |
Resolution: | 1 |
Range of values | |
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Minimum: | 1147 |
Maximum: | 18543 |
Units: | shot |
Resolution: | 1 |
Range of values | |
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Minimum: | 1.402069 |
Maximum: | 21.554634 |
Units: | kilometers |
Resolution: | 0.000001 |
This dataset contains trackline navigation for approximately 745 km of chirp seismic-reflection data collected by the U.S. Geological Survey during cruise 2014-009-FA offshore of Fire Island, NY. This information can help spatially correlate the subbottom data with other data in the GIS.
1. SIOSEIS (version 2013.1.1) was used to read SEG-Y files, renumber shots starting from one, extract the envelope-detected trace, and write out new SEG-Y files. The original shot numbers, which were assigned by SonarWiz sequentially over the duration of an acquisition session despite SEG-Y file changes, are preserved in the raw SEG-Y data.
2. The SIOSEIS script Sio_medianstk applied a two-trace median stack (trim 50 percent of the values furthest from the median amplitude) to improve subsequent water bottom picking.
3. The script Read512i_mstk was used to read renumbered and two-trace median filter stacked 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). Header information from each SEG-Y file was saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 100, 500, and shots with unique navigation coordinates. Geographic coordinates (WGS 84) were converted to UTM zone 18 N coordinates (WGS 84) using Proj (version 4.6.0). End shots and shots at multiples of 100 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images.
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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.
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.
Data format: | The WinZip (version 14.0) file contains a shapefile of chirp seismic-reflection tracklines collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center offshore of Fire Island, NY in 2014 and the associated metadata. in format Shapefile Shapefile Size: 3.1 |
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Network links: |
https://cmgds.marine.usgs.gov/data/field-activity-data/2014-009-FA/data/seismics/2014-009-FA_512i_Tracklines.zip https://doi.org/10.5066/F7FF3QTQ https://cmgds.marine.usgs.gov/data/field-activity-data/2014-009-FA/ |
This zip file contains data available in shapefile format. The user must have software capable of reading shapefile format to use these data.