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Data Series 897

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Identification_Information:
Citation:
Citation_Information:
Originator: Arnell S. Forde
Originator: Jennifer L. Miselis
Originator: James G. Flocks
Originator: Julie C. Bernier
Originator: Dana S. Wiese
Publication_Date: 2014
Title:
Archive of Digital Chirp Subbottom Profile Data Collected During USGS Cruises 13BIM02 and 13BIM07 Offshore of the Chandeleur Islands, Louisiana, 2013
Geospatial_Data_Presentation_Form: Tabular, vector, and raster digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Series
Issue_Identification: 897

Publication_Information:
Publication_Place: St. Petersburg, Fla.
Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/ds/0897/>

Description:
Abstract:
On July 5–19 (13BIM02) and August 22–September 1 (13BIM07) of 2013, the U.S. Geological Survey (USGS) conducted geophysical surveys to investigate the geologic controls on barrier island evolution and medium-term and interannual sediment transport along the oil spill mitigation sand berm constructed at the north end and offshore of the Chandeleur Islands, La. This investigation is part of a broader USGS study, which seeks to understand barrier island evolution better over medium time scales (months to years). This report serves as an archive of unprocessed, digital chirp subbottom data, trackline maps, navigation files, Geographic Information System (GIS) information, and formal Federal Geographic Data Committee (FGDC) metadata. Gained digital images of the seismic profiles are provided. The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG Y revision 0 format (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU). Examples of SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992) are provided.
These data are available for viewing using GeoMapApp (<http://www.geomapapp.org/>) and Virtual Ocean (<http://www.virtualocean.org/>) multi-platform open source software. In addition, the SEG Y files can also be downloaded from the USGS Coastal and Marine Geoscience Data System (<http://cmgds.marine.usgs.gov>).
Purpose:
To archive all digital chirp subbottom profile data and associated files collected during cruises 13BIM02 and 13BIM07.
Supplemental_Information:
The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, Fla., assigns a unique identifier to each cruise or field activity. For example, 13BIM02 indicates the data were collected in 2013 during the second field activity for that project in that calendar year. Refer to <http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html> for a detailed description of the method used to assign the cruise ID. The naming convention used for each subbottom line is as follows: yye##a, where 'yy' are the last two digits of the year in which the data were collected, 'e' is a 1-letter abbreviation for the equipment type (for example, c for 424 chirp), '##' is a 2-digit number representing a specific track, and 'a' is a letter representing a section of the line if recording was prematurely terminated or rerun for quality or acquisition problems.

All Chirp systems use a signal of continuously varying frequency; the system used during this survey produces high-resolution, shallow-penetration (typically less than 75-milliseconds (ms)) profile images of sub-seafloor stratigraphy. The towfish contains a transducer that transmits and receives acoustic energy and is typically towed 1–2 meters (m) below the sea's surface. As transmitted acoustic energy intersects density boundaries, such as the seafloor or sub-surface sediment layers, energy is reflected back toward the transducer, received, and recorded by a PC-based seismic acquisition system. This process is repeated at regular intervals (for example, 0.125 seconds (s)) and returned energy is recorded for a specific duration (for example, 50 ms). In this way, a two-dimensional (2-D) vertical image of the shallow geologic structure beneath the towfish is produced.

The seismic source utilized during 13BIM02 and 13BIM07 consisted of an EdgeTech SB-424 towfish running Discover v. 3.51 acquisition software and towed 2 m behind the Global Positioning System (GPS) antenna. The data were acquired using a frequency sweep of 4–20 kilohertz (kHz), a 43 kHz sample frequency, and a recording length of approximately 65 ms. Based on survey speeds of 3.5 knots, the shot spacing was about 0.450 m.

The binary portion of the unprocessed seismic data is stored in SEG Y rev. 0 (Barry and others, 1975), IBM float 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 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 examples of SU scripts that allow users to remove navigation fixes from the SEG Y headers, along with the fix provided for every 1,000 shots, and produce a printable Graphics Interface Format (GIF) image of each profile. The printable profiles provided are GIF images gained using SU software. Refer to the Software page of this report for links to example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20130705
Ending_Date: 20130901

Currentness_Reference: Data collection interval

Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.911767
East_Bounding_Coordinate: -88.832483
North_Bounding_Coordinate: 30.085831
South_Bounding_Coordinate: 30.017011

Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificinformation
Theme_Keyword: oceans

Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Geology
Theme_Keyword: Coastal information
Theme_Keyword: Marine
Theme_Keyword: Subbottom profile
Theme_Keyword: Seismic reflection
Theme_Keyword: Chirp
Theme_Keyword: Society of Exploration Geophysicists
Theme_Keyword: SEG Y
Theme_Keyword: Barrier Island Mapping
Theme_Keyword: 13BIM02
Theme_Keyword: 13BIM07

Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Content
Place_Keyword: United States of America
Place_Keyword: Louisiana
Place_Keyword: Gulf of Mexico
Place_Keyword: Chandeleur Islands

Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The U.S. Geological Survey requests to be acknowledged as originator of the data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: Saint Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0897/maps/13bim02_07_studyarea.jpg>
Browse_Graphic_File_Description:
Figure 1. Location map of all digital chirp subbottom data collected during USGS Field Activities 13BIM02 and 13BIM07. This map was created at a scale of 1:100,000.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0897/maps/13bim02_location.jpg>
Browse_Graphic_File_Description:
Figure 3. Detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13BIM02. This map was created at a scale of 1:50,000.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0897/maps/13bim07_location.jpg>
Browse_Graphic_File_Description:
Figure 4. Detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13BIM07. This map was created at a scale of 1:50,000.
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Funding and (or) support for this study was provided by the USGS Coastal and Marine Geology Program. We thank Research Vessel (R/V) Sallenger captains Patrick Dickhudt of the USGS Woods Hole Coastal and Marine Science Center (WHCMSC) and B.J. Reynolds (SPCMSC) for their assistance in data collection and Will Pfeiffer for his assistance with bathymetry data processing. This document was improved by reviews from Mark Hansen and Stanley Locker of the USGS - St. Petersburg, Fla. Disc Image Credit: Schmaltz, Jeff, MODIS Rapid Response Team at the National Aeronautics and Space Administration Goddard Space Flight Center, 2004, UnitedStates.A2004106.1855.500m.jpg. Also available on-line at <http://eoimages.gsfc.nasa.gov/ve/6886/UnitedStates.A2004106.1855.500m.jpg>
Cross_Reference:
Citation_Information:
Originator: Cohen, J.K., and Stockwell, J.W., Jr., CWP/SU
Publication_Date: 2010
Title:
Seismic Unix Release 41: A free package for seismic research and processing, Center for Wave Phenomena, Colorado School of Mines
Online_Linkage: <http://www.cwp.mines.edu/cwpcodes/>

Cross_Reference:
Citation_Information:
Originator: Zihlman, F.N., USGS
Publication_Date: 1992
Title:
DUMPSEGY V1.0: A program to examine the contents of SEG Y disk-image seismic data
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 92-590

Other_Citation_Details: 28 pages
Online_Linkage: <http://pubs.er.usgs.gov/usgspubs/ofr/ofr92590>

Cross_Reference:
Citation_Information:
Originator: Barry, K.M., Cavers, D.A., and Kneale, C.W.
Publication_Date: 1975
Title: Recommended standards for digital tape formats
Series_Information:
Series_Name: Geophysics
Issue_Identification: v. 40, no. 2

Other_Citation_Details: pages 344–352
Online_Linkage: <http://www.seg.org/publications/tech-stand/>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The validity or accuracy of marine subbottom profiles is highly qualitative and dependent on equipment and operating condition variables. Visual inspection of the images rendered from the data did not show major anomalies.

Logical_Consistency_Report:
These datasets are from two field activities with consistent instrument calibrations.
Completeness_Report:
These data are collected along tracklines (2-D) and are therefore inherently incomplete.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
As the subbottom data were acquired, the position of the vessel was continuously calculated by a CodaOctopus F190 DGPS [Digital Global Positioning System] and subsequently sent to Hypack 2010 navigation software to ensure consistent grid spacing during data collection. Positions were recorded and written to trace headers in latitude and longitude coordinates every 1 s using navigation from the CodaOctopus F190 receiver with OmniSTAR High Performance (HP) correction (accurate to within 20 centimeters (cm)). The approximate 5-m offset between the chirp shot and ship's GPS was not accounted for during acquisition, nor have the ASCII navigation files and or trackline maps been corrected to reflect the offset.

Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
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.

Lineage:
Process_Step:
Process_Description:
Chirp processing: The SEG Y data were processed with Seismic Unix software to produce gained GIF images of the subbottom profiles included in this report. A representative chirp data processing sequence consisted of (1) removing navigation data for each shot and converting it to SU format, (2) applying automatic gain control, (3) generating a PostScript image of the traces, and (4) converting the PostScript image to a GIF image. For additional SU processing and script details, please refer to <https://pubs.usgs.gov/ds/0897/software/su/readme.txt>.
Source_Used_Citation_Abbreviation: SEG Y
Process_Date: 2013
Source_Produced_Citation_Abbreviation: printable/SEG Y.gif
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov

Process_Step:
Process_Description:
Navigation processing: Shotpoint navigation, start of line, and 1,000-shot-interval location files were extracted using Seismic Unix software and output as ASCII text files; they were then processed with PROJ.4.7.0 (<http://trac.osgeo.org/proj/>) software to generate Universal Transverse Mercator (UTM) coordinates (WGS84, Zone 16, meters) from latitude and longitude coordinates. Text files for each seismic line were concatenated into comma-delimited text files (for use with Esri (Environmental Systems Research Institute) software); one containing unique shotpoint positions (13bim02.txt), another containing the 1,000-shot-interval locations (s13bim02.txt), and the last containing start-of-line locations (13bim02_s); which can be viewed within the nav folder. This process was repeated for 13BIM07 navigation data.
Source_Used_Citation_Abbreviation: 13c**.txt
Process_Date: 2013
Source_Produced_Citation_Abbreviation: 13bim02.txt and 13bim07.txt
Source_Produced_Citation_Abbreviation: s13bim02.txt and s13bim07.txt
Source_Produced_Citation_Abbreviation: 13bim02_s.txt and 13bim07_s.txt
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov

Process_Step:
Process_Description:
All 6 concatenated, comma-delimited text files were imported into ArcGIS and saved as either a point or polyline file (in Esri's shapefile format) and used in the maps presented in this archive. Trackline map creation: the trackline maps were created using Esri ArcGIS 10.2.1 software. The processed navigation files, 13bim02.txt and 13bim07.txt, were imported into ArcMap 10.2.1 and processed using the ArcScript "Points to Lines" to create a line shapefile of the cruise tracklines (13bim02_trkln and 13bim07_trkln). The 1,000-shot-interval files, s13bim02.txt and s13bim07.txt, and the start-of-line files, 13bim02_s.txt and 13bim07_s.txt, were imported into ArcMap and saved as point shapefiles 13bim02_shots, 13bim07_shots, 13bim02_sol and 13bim07_sol. Please refer to the shapefile metadata included in the ArcGIS map document in the Software section of this archive for additional details. All maps were exported to Adobe Illustrator v. 14 for further editing and converted into JPEG format with Adobe Dreamweaver v. 12 Build 5861. The maps are unprojected (geographic coordinates, WGS84). The USGS is the originator of all layers used. Please see the ArcGIS readme file for detailed information about the GIS files used in this report.
Source_Used_Citation_Abbreviation: 13bim02.txt and 13bim07.txt
Source_Used_Citation_Abbreviation: s13bim02.txt and s13bim07.txt
Source_Used_Citation_Abbreviation: 13bim02_s.txt and 13bim07_s.txt
Process_Date: 2013
Source_Produced_Citation_Abbreviation: 13bim02_trkln.shp and 13bim07_trkln.shp
Source_Produced_Citation_Abbreviation: 13bim02_shots.shp and 13bim07_shots.shp
Source_Produced_Citation_Abbreviation: 13bim02_sol.shp and 13bim07_sol.shp

Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov

Process_Step:
Process_Description:
Data Series preparation: In addition to the process steps described above, the following steps were taken to produce this Data Series report: the handwritten cruise logs were scanned and saved as a PDF file, digital logs were created by J. Bernier using the cruise logs and the personal accounts of crew members and saved as PDF files, and an HTML-based format was used to present the various parts of this archive.
Process_Date: 2014

Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell S. Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Horizontal X and Y locations (latitude and longitude in Zone 16 UTM coordinates) for each shot are provided as ASCII text files, along with the date and time (Universal Coordinated Time (UTC)) the shot was recorded.

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0197885540
Longitude_Resolution: 0.0227288676
Geographic_Coordinate_Units: Decimal Degrees

Geodetic_Model:
Horizontal_Datum_Name: D WGS 84
Ellipsoid_Name: WGS 1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 13bim02.txt, 13bim07.txt, s13bim02.txt, s13bim07.txt, 13bim02_s.txt and 13bim07_s.txt
Entity_Type_Definition: Shotpoint navigation files
Entity_Type_Definition_Source: SEG Y headers (<http://www.seg.org/publications/tech-stand>).

Attribute:
Attribute_Label: FID*
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape*
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: UTMX
Attribute_Definition: UTM-X coordinate (Zone 16)
Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 322674
Range_Domain_Maximum: 323285
Attribute_Units_of_Measure: meters

Attribute:
Attribute_Label: UTMY
Attribute_Definition: UTM-Y coordinate (Zone 16)
Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3322649
Range_Domain_Maximum: 3323733
Attribute_Units_of_Measure: meters

Attribute:
Attribute_Label: Line
Attribute_Definition: Trackline number
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain:
The naming convention used for each subbottom line is as follows: yye##a, where 'yy' are the last two digits of the year in which the data were collected, 'e' is a 1-letter abbreviation for the equipment type (for example, c for Chirp), '##' is a 2-digit number representing a specific track, and 'a' is a letter representing a section of the line if recording was prematurely terminated or rerun for quality or acquisition problems.
Attribute:
Attribute_Label: Shot
Attribute_Definition: Shotpoint number
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 11000

Attribute:
Attribute_Label: Lon
Attribute_Definition: Longitude (decimal degrees)
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -88.839000
Range_Domain_Maximum: -88.832483
Attribute_Units_of_Measure: decimal degrees

Attribute:
Attribute_Label: Lat
Attribute_Definition: Latitude (decimal degrees)
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 30.022103
Range_Domain_Maximum: 30.031792
Attribute_Units_of_Measure: decimal degrees

Attribute:
Attribute_Label: YEAR
Attribute_Definition: Year
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2013
Range_Domain_Maximum: 2013

Attribute:
Attribute_Label: DOY:HR:MIN:SEC
Attribute_Definition: Day of year:hour:minute:second
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Day of year, hour, minute and second of data acquisition
Overview_Description:
Entity_and_Attribute_Overview:
Binary data file: Trace data are available as binary files in SEG Y format. These files have a .sgy extension and range in size from 2.5 to 123 MB. These data can be found by going to <http://cmgds.marine.usgs.gov>.
Entity_and_Attribute_Overview:
Graphic image file: Printable versions of the subbottom profiles are available as GIF images; links to these images can be found on the Profiles page of this report or by going to <https://pubs.usgs.gov/ds/0897/profiles/printable/>.
Entity_and_Attribute_Overview:
Navigation file: Navigation files are available as ASCII text files. Provided are raw (unprocessed) shotpoint navigation files (13c**.txt), processed shotpoint navigation (13bim02.txt and 13bim07.txt), processed 1,000-shot-interval locations (s13bim02.txt and s13bim07.txt), and start of line files (13bim02_s.txt and 13bim07_s.txt). Attributes [FID, Shape] marked above with an asterisk (*) were created by Esri ArcGIS and are used exclusively by the shapefiles created with ArcMap; these attributes are not included in the original navigation files. All remaining attributes listed above, under the Detailed_Description section, that do not have an accompanying asterisk are found in the processed navigation files. Raw and processed navigation data files can be found by going to <https://pubs.usgs.gov/ds/0897/nav/>.
Entity_and_Attribute_Overview:
GIS file: The GIS data is provided as a .zip file composed of Esri map documents, shapefiles, and metadata.
Entity_and_Attribute_Detail_Citation: Information is derived from SEG Y headers.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov
Contact_Instructions:
All of this report is available online. The SEG Y files are downloadable from the Coastal and Marine Geoscience Data System (<http://cmgds.marine.usgs.gov>).

Resource_Description: U.S. Geological Survey Data Series 897
Distribution_Liability:
This DVD publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SEG Y rev. 0
Format_Information_Content:
The SEG Y rev. 0 format (Barry and others, 1975) presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an ASCII header block followed by a 400-byte binary header block, both of which include information specific to line and reel number; a trace data block that follows the reel identification header, with the first 240 bytes of each trace block consisting of the binary trace identification header; and seismic data samples that follow the trace identification header.
File_Decompression_Technique: None
Transfer_Size: 3.598 GB

Digital_Transfer_Option:
Offline_Option:
Offline_Media: DVD
Recording_Format: ISO 9660
Compatibility_Information: Unix, Linux, DOS, Macintosh

Digital_Form:
Digital_Transfer_Information:
Format_Name: map document, shapefile, metadata
Format_Information_Content:
The GIS data is composed of map documents, shapefiles, and metadata. Map documents were created with Esri ArcGIS 10.2.1 software. The shapefiles provided may also be viewed using other versions of Esri desktop software including their free software or ArcGIS Explorer (<http://www.esri.com/software/arcgis/explorer/>).
File_Decompression_Technique: unzip
Transfer_Size: 33 MB

Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/ds/0897/software/arc/arc.zip>

Fees: None, if obtained online; otherwise, prices vary.
Ordering_Instructions:
Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov).

Technical_Prerequisites:
Use of SEG Y data requires specialized seismic processing software, such as public domain software Seismic Unix (<http://www.cwp.mines.edu/cwpcodes/>).

Metadata_Reference_Information:
Metadata_Date: 20140325
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Arnell Forde
Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: (727) 502-8000
Contact_Electronic_Mail_Address: aforde@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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