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Data Series 829

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Archive of Digital Chirp Subbottom Profile Data Collected During USGS Cruise 13GFP01, Brownlee Dam and Hells Canyon Reservoir, Idaho and Oregon, 2013

By Arnell S. Forde, Shawn V. Dadisman, James G. Flocks, Ryan Fosness, Chris Welcker, and Kyle W. Kelso

FGDC Metadata

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Identification_Information:
Citation:
Citation_Information:
Originator: Arnell S. Forde
Originator: Shawn V. Dadisman
Originator: James G. Flocks
Originator: Ryan Fosness
Originator: Chris Welcker
Originator: Kyle W. Kelso
Publication_Date: 2014
Title:
Archive of Digital Chirp Subbottom Profile Data Collected During USGS Cruise 13GFP01, Brownlee Dam and Hells Canyon Reservoir, Idaho and Oregon, 2013
Geospatial_Data_Presentation_Form: Tabular, vector, and raster digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Series
Issue_Identification: 829

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

Online_Linkage: <https://pubs.usgs.gov/ds/0829/>

Description:
Abstract:
From March 16 to 31, 2013, the U.S. Geological Survey conducted a geophysical survey to investigate sediment deposits and long-term sediment transport within the Snake River from Brownlee Dam to Hells Canyon Reservoir, along the Idaho and Oregon border; this effort will help the USGS to better understand geologic processes. This report serves as an archive of unprocessed digital chirp subbottom data, trackline maps, navigation files, GIS information, and formal FGDC metadata. Gained digital images of the seismic profiles are also 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). Example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992) are also provided.
These data are also 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 cruise 13GFP01.
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, 13GFP01 tells us the data were collected in 2013 during the first 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: yyGFP01_##a, where 'yy' are the last two digits of the year in which the data were collected, 'GFP01' represents the Geological Framework Processes project and activity number for which the data were collected, '##' is a 2-digit number representing a specific track, and 'a' is a letter representing the section of a 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 50-ms) profile images of sub-surface stratrigraphy. The towfish contains a transducer that transmits and receives acoustic energy and is typically towed 1 - 2 m below the water surface. As transmitted acoustic energy intersects density boundaries, such as the river bottom or sub-surface sediment layers, some energy is reflected back toward the transducer, received, and recorded by a PC-based seismic acquisition system. This process is repeated at regular time intervals (for example, 0.125 s) and returned energy is recorded for a specific duration (for example, 75 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 13GFP01 consisted of an EdgeTech SB-424 towfish running DISCOVER v. 3.51 acquisition software and towed approximately 2 - 5 m behind the GPS antenna. The data were acquired using a frequency sweep that varied between 4 to 24 kHz, a 43-kHz sample frequency, and approximately 130-ms record length. Based on survey speeds of 3.5 knots, the shot spacing was about 0.450 m.

The binary portion of the unprocessed seismic data are 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 ASCII format instead of 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 example SU scripts that allow the user to strip off navigation fixes from the SEG Y headers, along with a fix for every 1,000 shots, and produce a printable, gained GIF image of each profile. The printable profiles provided here are GIF images that were 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: 20130316
Ending_Date: 20130331

Currentness_Reference: Data collection interval

Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -117.244106
East_Bounding_Coordinate: -116.700558
North_Bounding_Coordinate: 45.242786
South_Bounding_Coordinate: 44.363828

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

Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Geology
Theme_Keyword: River
Theme_Keyword: Subbottom profile
Theme_Keyword: Seismic reflection
Theme_Keyword: Chirp
Theme_Keyword: Society of Exploration Geophysicists
Theme_Keyword: SEG Y
Theme_Keyword: Geological Framework Processes
Theme_Keyword: 13GFP01

Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Content
Place_Keyword: United States of America
Place_Keyword: Idaho
Place_Keyword: Oregon
Place_Keyword: Snake River
Place_Keyword: Brownlee Dam
Place_Keyword: Hells Canyon Reservoir

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/0829/maps/13gfp01_location.jpg>
Browse_Graphic_File_Description:
Figure 3. Location map of all digital chirp subbottom data collected during USGS Field Activity 13GFP01. This map was created at a scale of 1:604,660.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0829/maps/13gfp01_area1.jpg>
Browse_Graphic_File_Description:
Figure 4. Area 1 detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13GFP01. This map was created at a scale of 1:177,130.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0829/maps/13gfp01_area1a.jpg>
Browse_Graphic_File_Description:
Figure 5. Area 1a detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13GFP01. This map was created at a scale of 1:106,900.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0829/maps/13gfp01_area2.jpg>
Browse_Graphic_File_Description:
Figure 6. Area 2 detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13GFP01. This map was created at a scale of 1:113,600.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0829/maps/13gfp01_area3.jpg>
Browse_Graphic_File_Description:
Figure 7. Area 3 detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13GFP01. This map was created at a scale of 1:20,830.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0829/maps/13gfp01_area3a.jpg>
Browse_Graphic_File_Description:
Figure 8. Area 3a detailed trackline map of digital chirp subbottom data collected during USGS Field Activity 13GFP01. This map was created at a scale of 1:5,850.
Browse_Graphic_File_Type: JPEG

Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/0829/profiles/printable/>
Browse_Graphic_File_Description:
Directory containing printable images of all subbottom profiles.
Browse_Graphic_File_Type: GIF

Data_Set_Credit:
Funding and (or) support for this study was provided by the USGS Coastal and Marine Geology Program and Idaho Water Science Center (IWSC). This document was improved by the reviews of Lisa Robbins and Nancy DeWitt of the USGS - St. Petersburg, Fla. Disc Image Credit: Image was captured by NASA's Landsat-7 (<http://landsat.gsfc.nasa.gov/>) satellite on September 19, 2002 and created by Jesse Allen, using Landsat data provided by the USGS. Available on-line at <http://eoimages.gsfc.nasa.gov/images/imagerecords/37000/37320/hellscanyon_l7_2002262_lrg.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 depends on equipment and operating condition variables. Visual inspection of the images rendered from the data did not show any major anomalies.

Logical_Consistency_Report:
This dataset is from one field activity with consistent instrument calibrations.
Completeness_Report:
These data are collected along tracklines (2-D) and are therefore inherently incomplete. Geologic details between lines must be inferred. No data were collected for lines 13GFP01_10, 13GFP01_27, 13GFP01_30, 13GFP01_45, 13GFP01_50 and 13GFP01_70. Line 13GFP01_01 lost navigation data after shot 15837 and there is an unexplained jump in the DOY from 72 to 76 at shot 10494. Line 13GFP01_31 does not have navgation data until shot 16277; line 13GFP01_39 only has navigation until shot 5344 (please see the operation log for additional information).
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
As the subbottom data were acquired, the position of the vessel was continuously determined by a CodaOctopus F190 DGPS and subsequently sent to Hypack 2010 navigation software to ensure a consistent grid spacing during data collection. Positions were recorded and written to the trace headers in latitude and longitude coordinates about every 1 s using navigation from the CodaOctopus F190 receiver with OmniSTAR High Performance (HP) correction (accurate to within 20 cm). The approximately 2- to 5-m offset between the chirp shot and ship's GPS was not accounted for during acquisition nor have the ASCII navigation files and 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 acquisition system was set to only record up to 200 MB of data for each file. Any line exceeding this limitation was divided into two trace files or more (for example, 13GFP01_26 and 13GFP01_26a). The SEG Y data were processed with Seismic Unix to produce gained GIF images of the subbottom profiles included in this report. A representative chirp data processing sequence consisted of (1) stripping off navigation data for each shot and converting 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/0829/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/>) to generate UTM coordinates (WGS84, Zone 11, meters) from latitude and longitude coordinates. Text files for each seismic line were concatenated into comma-delimited text files (for use with ESRI software); one containing unique shotpoint positions (13gfp01.txt), another containing the 1,000-shot-interval locations (s13gfp01.txt) and the last containing start of line locations (13gfp01_s), which can be viewed within the nav folder.
Source_Used_Citation_Abbreviation: 13GFP01_**.txt
Process_Date: 2013
Source_Produced_Citation_Abbreviation: 13gfp01.txt
Source_Produced_Citation_Abbreviation: s13gfp01.txt
Source_Produced_Citation_Abbreviation: 13gfp01_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 concatenated, comma-delimited text files were imported into ArcGIS and saved as either a point or polyline file in the ESRI shapefile format. Trackline map creation: The trackline maps were created using ESRI ArcGIS 10.1 software. The processed navigation file, 13gfp01.txt, was imported into ArcMap 10.1 and processed using the Points to Lines ArcScript to create a line shapefile of the cruise tracklines (13gfp01_trkln). The 1,000-shot-interval file, s13gfp01.txt, and the start of line file, 13gfp01_s.txt, were imported into ArcMap and exported as point shapefiles 13gfp01_shots and 13gfp01_sol. Please refer to the shapefile metadata included in the ArcGIS map document located under the Software section of this archive for additional details. All maps were exported to Adobe Illustrator v. 14 for further editing then later converted into JPEG format by Adobe Dreamweaver v. 10 Build 4117. 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: 13gfp01.txt
Source_Used_Citation_Abbreviation: s13gfp01.txt
Source_Used_Citation_Abbreviation: 13gfp01_s.txt
Process_Date: 2013
Source_Produced_Citation_Abbreviation: 13gfp01_shots.shp
Source_Produced_Citation_Abbreviation: 13gfp01_trkln.shp
Source_Produced_Citation_Abbreviation: 13gfp01_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 A. Forde using the cruise logs and personal accounts of the crew members and saved as PDF files, and an HTML-based format was used to present the various parts of this archive.
Process_Date: 2013

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 and Zone 11 UTM coordinates) for each shot are provided as ASCII text files, along with the date and time (UTC) the shot was recorded.

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0197271584
Longitude_Resolution: 0.0276569562
Geographic_Coordinate_Units: Decimal Degrees

Geodetic_Model:
Horizontal_Datum_Name: D WGS 1984
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: 13gfp01.txt, s13gfp01.txt, and 13gfp01_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 11)
Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 495994
Range_Domain_Maximum: 496507
Attribute_Units_of_Measure: meters

Attribute:
Attribute_Label: UTMY
Attribute_Definition: UTM-Y coordinate (Zone 11)
Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4954322
Range_Domain_Maximum: 4954709
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: yyGFP01_##a, where 'yy' are the last two digits of the year in which the data were collected, 'GFP01' represents the Geological Framework Processes project and activity number for which the data were collected, '##' is a 2-digit number representing a sprecific track, and 'a' is a letter representing the section of a 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: 11354

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: -117.050725
Range_Domain_Maximum: -117.044122
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: 44.742278
Range_Domain_Maximum: 44.745758
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 8.8 to 922 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/0829/profiles/printable/>.
Entity_and_Attribute_Overview:
Navigation file: Navigation files are available as ASCII text files. Provided are raw (unprocessed) shotpoint navigation files (13gfp01_**.txt), processed shotpoint navigation (13gfp01.txt), processed 1,000-shot-interval location (s13gfp01.txt), and a start of line file (13gfp01_s.txt). Fields/Attributes [FID, Shape] marked above with an asterisk (*) were created by ESRI ArcGIS and are used exclusively by the shapefiles created from the three aforementioned .txt files; these fields are not included in the original navigation files. All remaining attributes listed above in the "Entity_and_Attribute_Information:" section that do not have an accompanying asterisk are found in 13gfp01.txt, s13gfp01.txt, and13gfp01_s.txt. Raw and processed navigation data files can be found by going to <https://pubs.usgs.gov/ds/0829/nav/>.
Entity_and_Attribute_Overview:
GIS file: The GIS data used to create the trackline maps are provided in 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 829
Distribution_Liability:
This DVD publication was prepared by an agency of the United States Government. Although these data have been 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: 24.25 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 project used to create the trackline maps is composed of map documents, shapefiles, and metadata. Map documents were created with ESRI ArcGIS 10.1 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: 61 MB

Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/ds/0829/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: 20140303
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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