Metadata: Identification_Information: Citation: Citation_Information: Originator: Arnell S. Forde Originator: Shawn V. Dadisman Originator: Jennifer L. Miselis Originator: James G. Flocks Originator: Dana S. Wiese Publication_Date: 2013 Title: Archive of Digital Chirp Subbottom Profile Data Collected During USGS Cruise 11BIM01 Offshore of the Chandeleur Islands, Louisiana, June 2011 Geospatial_Data_Presentation_Form: Archive for Subbottom Profile Data Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 772 Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/772/ Online_Linkage: http://cmgds.marine.usgs.gov/data/11BIM01/ Online_Linkage: http://pubs.usgs.gov/ds/772/software/arc/ Description: Abstract: In June of 2011, the U.S. Geological Survey conducted a geophysical survey offshore of the Chandeleur Islands, LA to investigate the geologic controls on barrier island framework. 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 11BIM01. Supplemental_Information: The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, FL, assigns a unique identifier to each cruise or field activity. For example, 11BIM01 tells us the data were collected in 2011 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: 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 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-seafloor stratrigraphy. The towfish contains a transducer that transmits and receives acoustic energy and is typically towed 1 - 2 m below the sea surface. As transmitted acoustic energy intersects density boundaries, such as the seafloor 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, 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 11BIM01 consisted of an EdgeTech SB-424 towfish running DISCOVER v. 3.51 acquisition software and towed about 2 m behind the GPS antenna. The data were acquired using a frequency sweep that varied between 4 - 24 kHz; 4 - 20 kHz and 4 - 16 kHz, a 43 kHz sample frequency, and approximately 75 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 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: 20110603 Ending_Date: 20110613 Currentness_Reference: Data collection interval Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.920242 East_Bounding_Coordinate: -88.788672 North_Bounding_Coordinate: 30.101264 South_Bounding_Coordinate: 29.871811 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:83ab2ec2-1f09-4180-aa32-94cbc84cf0b0 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificinformation Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: General 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: 11BIM01 Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: distributions Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: seismic reflection Theme_Keyword: marine geophysics Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: seismic reflection methods Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geophysics 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) 803-8747 ext. 3111 Contact_Electronic_Mail_Address: aforde@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_location.jpg Browse_Graphic_File_Description: Location map (fig. 1) of all digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:157,950. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_area1.jpg Browse_Graphic_File_Description: Detailed trackline map (fig.3) of digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:27,950. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_area2.jpg Browse_Graphic_File_Description: Detailed trackline map (fig.4) of digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:24,000. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_area3.jpg Browse_Graphic_File_Description: Detailed trackline map (fig.5) of digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:30,000. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_area4.jpg Browse_Graphic_File_Description: Detailed trackline map (fig.6) of digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:30,000. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_area5.jpg Browse_Graphic_File_Description: Detailed trackline map (fig.7) of digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:29,500. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/maps/11bim01_area6.jpg Browse_Graphic_File_Description: Detailed trackline map (fig.8) of digital chirp subbottom data collected during USGS Field Activity 11BIM01. This map was created at a scale of 1:79,500. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/ds/772/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. We thank R/V Survey Cat captain Nancy DeWitt (SPCMSC) for her assistance in data collection and Will Pfeiffer and Noreen Buster for their assistance with swath data processing. This document was improved by the reviews Paul Knorr and Kyle Kelso of the USGS - St. Petersburg, FL.Disc Image Credit: Schmaltz, Jeff, MODIS Rapid Response Team at the NASA 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/index.html 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 11c49, 11c74, 11c75, 11c76, and 11c131. While attempting to collect data for line 11c49, it was determined that the chirp cable was malfunctioning. A temporary splint was placed on the cable for line 11c50; however, a generator failure also occurred at this time resulting in the system being restarted for the subsequent line. Line 11c51 lost navigation data between shots 3032-3510, which was probably due to the loss of power mentioned previously. No navigation fixes were recoreded for line 11c128_b from shots 3281-3523, this too was most likely caused by a temporary loss of power (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-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. Any elevation change of the towfish is recorded in the logbooks and identifiable on the subbottom profiles by steep, abrupt shifts in the seafloor return. Lineage: Process_Step: Process_Description: Chirp processing: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 http://pubs.usgs.gov/ds/772/software/su/readme.txt. Source_Used_Citation_Abbreviation: SEG Y Process_Date: 2012 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) 803-8747, ext. 3111 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 16, meters) from latitude and longitude coordinates. Text files for each seismic line were concatenated into two comma-delimited text files (for use with ESRI software), one containing unique shotpoint positions (11bim01.txt) and another containing the 1,000-shot-interval locations (s11bim01.txt); both can be viewed within the nav folder. Source_Used_Citation_Abbreviation: 11c**.txt Process_Date: 2012 Source_Produced_Citation_Abbreviation: 11bim01.txt Source_Produced_Citation_Abbreviation: s11bim01.txt Source_Produced_Citation_Abbreviation: 11bim01_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) 803-8747, ext. 3111 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 was created using ESRI ArcGIS 10 software. The processed navigation file, 11bim01.txt, was imported into ArcMap 10 and processed using the Points to Lines ArcScript (D. Rathert, http://arcscripts.esri.com/details.asp?dbid=12702) to create a line shapefile of the cruise tracklines (11bim01_trkln). The 1,000-shot-interval file s11bim01.txt and the start of line file 11bim01_s.txt were imported into ArcMap as point shapefiles 11bim01_shots and 11bim01_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 was 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. Please see the ArcGIS readme file for detailed information about the GIS files used in this report. Source_Used_Citation_Abbreviation: 11bim01.txt Source_Used_Citation_Abbreviation: s11bim01.txt Source_Used_Citation_Abbreviation: 11bim01_s.txt Process_Date: 2012 Source_Produced_Citation_Abbreviation: 11bim01_shots.shp Source_Produced_Citation_Abbreviation: 11bim01_trkln.shp Source_Produced_Citation_Abbreviation: 11bim01_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) 803-8747, ext. 3111 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: 2012 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) 803-8747, ext. 3111 Contact_Electronic_Mail_Address: aforde@usgs.gov Process_Step: Process_Description: Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Process_Date: 20170124 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Alan O. Allwardt Contact_Position: Contractor -- Information Specialist Contact_Address: Address_Type: mailing and physical address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7551 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: aallwardt@usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20201013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Horizontal X and Y locations (latitude and longitude and Zone 16 UTM coordinates) for each shot are provided as ASCII text files, along with the date and time (UTC) the shot was recorded. Direct_Spatial_Reference_Method: Point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: WGS84 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.25722210100002 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 11bim01.txt, s11bim01.txt, and 11bim01_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: 315130 Range_Domain_Maximum: 326898 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: 3308709 Range_Domain_Maximum: 3331466 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 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: -88.917917 Range_Domain_Maximum: -88.793833 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: 29.896167 Range_Domain_Maximum: 30.101153 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: 2011 Range_Domain_Maximum: 2011 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 6.1 to 200.3 MB. These data can be found by going to http://pubs.usgs.gov/772/647/segy. 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 or by going to http://pubs.usgs.gov/ds/772/profiles/printable/. Entity_and_Attribute_Overview: Navigation file: Navigation files are available as ASCII text files. Provided are raw (unprocessed) shotpoint navigation files (11c**.txt), processed shotpoint navigation (11bim01.txt), processed 1,000-shot-interval location (s11bim01.txt), and a start of line file (11bim01_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 11bim01.txt, s11bim01.txt, and11bim01_s.txt. Raw and processed navigation data files can be found by going to http://pubs.usgs.gov/ds/772/nav/. Entity_and_Attribute_Overview: GIS file: The GIS project used to create the trackline maps 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) 803-8747, ext. 3111 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 772 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: 29410 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://cmgds.marine.usgs.gov/data/11BIM01/ 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 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/index.html). File_Decompression_Technique: unzip Transfer_Size: 149 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/772/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/index.html). Metadata_Reference_Information: Metadata_Date: 20201013 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) 803-8747, ext. 3111 Contact_Electronic_Mail_Address: aforde@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998