Metadata: Identification_Information: Citation: Citation_Information: Originator: Stephen T. Bosse Originator: James G. Flocks Originator: Arnell S. Forde Publication_Date: 20170622 Title: Archive of digitized analog boomer seismic reflection data collected during U.S. Geological Survey cruise Acadiana 87-2 in the northern Gulf of Mexico, June 1987 Geospatial_Data_Presentation_Form: Multimedia presentation Series_Information: Series_Name: U.S. Geological Survey Data Release Issue_Identification: doi:10.5066/F7F47MC2 Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F7F47MC2 Description: Abstract: The U.S. Geological Survey (USGS) Coastal and Marine Geology Program has actively collected geophysical and sedimentological data in the northern Gulf of Mexico for several decades, including shallow subsurface data in the form of high-resolution seismic-reflection profiles (HRSP). Prior to the mid-1990s most HRSP data were collected in analog format as paper rolls of continuous profiles up to 25 meters long. A large portion of this data resides in a single repository with minimal metadata. As part of the National Geological and Geophysical Data Preservation Program, scientists at the USGS St. Petersburg Coastal and Marine Science Center are converting the analog paper records to digital format using a large-format continuous scanner. This data release serves as an archive of seismic profiles with headers, converted Society of Exploration Geophysicists Y format (SEG-Y) files, navigation data, and geographic information system (GIS) data files for digitized boomer seismic-reflection data collected from the Research Vessel (R/V) Acadiana. The Acadiana 87-2 geophysical cruise included seismic data collected in the northern Gulf of Mexico, Chandeleur Sound, and Mississippi Sound from June 15 to June 26, 1987. Purpose: To archive all digitized analog boomer seismic profile data and associated files collected along the northern Gulf of Mexico, during the Acadiana geophysical cruise. Supplemental_Information: The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) currently holds 13 major geophysical surveys from the northern Gulf of Mexico in its paper repository. A conservative estimate of 2,000 line-kilometers (km) of data is available. Paper copies of data are difficult and expensive to duplicate and share with other facilities, and cannot be analyzed using standard GIS and interpretative software. Conversion of this data into a usable digital format is necessary to archive the geologic information that otherwise might be lost, requiring additional redundant and very expensive marine geophysical surveys. The USGS National Geological and Geophysical Data Preservation Program (NGGDPP, http://datapreservation.usgs.gov) addresses the need to preserve, catalog, and provide access to geological and geophysical data for scientific research and economic development. In addition to the current efforts under the NGGDPP, four geophysical investigations from the 1980s and 1990s were previously archived through a preservation project in collaboration with the Bureau of Ocean Energy Management (Harrison and others, 2007; Sanford and others, 2009a, b, c). The USGS-SPCMSC scans its analog HRSP holdings using a large-format continuous scanner. The analog to digital conversion process used for this dataset is similar to the processes used previously in Harrison and others, (2007) and Sanford and others, (2009a, b, c). The digital files were converted into Tagged Image File Format (TIFF) for standard accessibility by raster image processors. The TIFF images of the seismic profiles were also converted into SEG-Y format. This standard non-proprietary format is the accepted industry standard for seismic data, and can be accessed by all major seismic data processing and interpretation systems. To accompany the HRSP, navigation and metadata files are generated for use in GIS, database and Internet Message Access Protocol (IMAP) services, and included in USGS data archives. The northern Gulf of Mexico is a passive continental margin, where minimal structural change to the shallow stratigraphy has occurred during the last few thousand years (Anderson and others, 2004). Therefore, subsurface data collected from this environment for the purposes of geologic assessment can be considered useful in perpetuity. The geologic information collected by the USGS in the northern Gulf of Mexico remains a valuable resource for sea floor and stratigraphic investigations, and is continuously revisited by researchers interested in Holocene and recent earth processes. For example, decades-old geologic data is commonly used in sediment resource studies in coastal Louisiana (for example, Kindinger and others, 2001; Kulp and others, 2002; Rogers and others, 2009) and previously collected datasets across the Mississippi-Alabama shelf have been used in recent geologic-framework assessments (Roberts and others, 2004; Greene and others, 2007; Flocks and others, 2011). This publication describes data collection and processing methods for seismic profiles created from analog boomer seismic-reflection data collected during the Acadiana 87-2 survey in June of 1987. The seismic data were collected using a single-channel Huntec boomer/benthos hydrophone system with Ocean Research Equipment (ORE) Geopulse power supply. The system consists of an electromagnetic sound source mounted on a catamaran sled towed behind the vessel at the water surface. The signal emitted from the sound source is received by a 5 m-long hydrophone streamer towed alongside the sled. The received signal is processed into response amplitudes via a topside computer running the acquisition software; the settings varied by cruise. The seismic data were printed onto paper rolls as two-dimensional profiles representing track length and depth (time). Geographic positioning of the system was collected using a long range navigation (LORAN) system and annotated onto the paper copies. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19870615 Ending_Date: 19870626 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89.324 East_Bounding_Coordinate: -88.116 North_Bounding_Coordinate: 30.2467 South_Bounding_Coordinate: 29.1042 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:9c757d71-5fc2-4ca4-b72c-536bc7a40990 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 Theme_Keyword: Marine Theme_Keyword: Seismic reflection Theme_Keyword: Society of Exploration Geophysicists Theme_Keyword: SEG-Y Theme_Keyword: BIM (Barrier Island Mapping) Theme_Keyword: R/V Acadiana Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine geology Theme_Keyword: sediment transport Theme_Keyword: ocean processes Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Content Place_Keyword: United States of America Place_Keyword: Gulf of Mexico Place_Keyword: Louisiana Place_Keyword: Mississippi Place_Keyword: Alabama Place_Keyword: Cat Island Place_Keyword: Mississippi Sound Place_Keyword: Chandeleur Sound Access_Constraints: None. These data are held in the public domain. Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@usgs.gov Cross_Reference: Citation_Information: Originator: Anderson, J.B., Rodriguez, A., Abdulah, K.C., Fillon, R.H., Banfield, L.A., McKeown, H.A., and Wellner, J.S. Publication_Date: 2004 Title: Late Quaternary stratigraphic evolution of the northern Gulf of Mexico margins—A synthesis, in Anderson, J., and Fillon, R., eds., Late Quaternary stratigraphic evolution of the Northern Gulf of Mexico Series_Information: Series_Name: Society for Sedimentary Geology Issue_Identification: 79 Other_Citation_Details: pages 1-24 Online_Linkage: https://mr.crossref.org/iPage?doi=10.2110%2Fpec.04.79.0001 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://library.seg.org/doi/pdf/10.1190/1.1440530 Cross_Reference: Citation_Information: Originator: Bosse, S.T., Flocks, J.G., Forde, A.S. Publication_Date: 20170421 Title: Digitized analog boomer seismic-reflection data collected during U.S. Geological Survey cruises Erda 90-1_HC, Erda 90-1_PBP, and Erda 91-3 in Mississippi Sound, June 1990 and September 1991 Geospatial_Data_Presentation_Form: Multimedia presentation Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 1047 Publication_Information: Publication_Place: St. Petersburg, FL Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ds1047 Cross_Reference: Citation_Information: Originator: Flocks, J.G., Ferina, N.F., and Kindinger, J.L. Publication_Date: 2011 Title: Recent geologic framework and geomorphology of the Mississippi-Alabama shelf, northern Gulf of Mexico, in, Buster, N.A., and Holmes, C.W., eds., Gulf of Mexico origin, waters, and biota—Volume 3, geology Series_Information: Series_Name: College Station, Texas, Texas A&M University Press Issue_Identification: 3 Other_Citation_Details: pages 157-173 Online_Linkage: https://muse.jhu.edu/book/1783 Cross_Reference: Citation_Information: Originator: Greene, D.L., Jr., Rodriquez, A.B., and Anderson, J.B. Publication_Date: 2007 Title: Seaward-branching coastal-plain and piedmont incised-valley systems through multiple sea-level cycles—Late Quaternary examples from Mobile Bay and Mississippi Sound, U.S.A Series_Information: Series_Name: Journal of Sedimentary Research Issue_Identification: 77 Other_Citation_Details: pages 139-158 Online_Linkage: http://jsedres.geoscienceworld.org/content/77/2/139 Cross_Reference: Citation_Information: Originator: Harrison, A.S., Dadisman, S.V., Kindinger, J.L., Morton, R.A., Blum, M.D., Wiese, D.S., and Subino, J.A. Publication_Date: 2007 Title: Archive of digitized analog boomer seismic reflection data collected during USGS cruise 96CCT02 in Copano, Corpus Christi, and Nueces Bays and Corpus Christi Bayou, Texas, July 1996 Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 296 Online_Linkage: https://pubs.usgs.gov/ds/296/ Cross_Reference: Citation_Information: Originator: Kindinger, J.L., Flocks, J.G., Kulp, M.A., Penland, S., and Britsch, L.D. Publication_Date: 2001 Title: Sand resources, regional geology, and coastal processes for the restoration of the Barataria barrier shoreline Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2001-384 Other_Citation_Details: 69 pages Online_Linkage: https://pubs.er.usgs.gov/publication/ofr01384 Cross_Reference: Citation_Information: Originator: Kulp, M.A., Howell, P.D., Adiau, S., Penland, S., Kindinger, J.L., and Williams, S.J. Publication_Date: 2002 Title: Latest Quaternary stratigraphic framework of the Mississippi River delta region Series_Information: Series_Name: Gulf Coast Association of Geological Society Transactions Issue_Identification: 52 Other_Citation_Details: pages 573-582 Online_Linkage: http://archives.datapages.com/data/gcags/data/052/052001/0573.htm#a1 Cross_Reference: Citation_Information: Originator: Roberts, H.H., Fillon, R.H., Kohl, B., Robalin, J.M., and Sydow, J.C. Publication_Date: 2004 Title: Depositional architecture of the Lagniappe Delta:Sediment characteristics, timing of depositional events, and temporal relationship with adjacent shelf-edge deltas, in Anderson, J.B., and Fillon, R., eds., Late Quaternary stratigraphic evolution of the northern Gulf of Mexico Series_Information: Series_Name: Society for Sedimentary Geology Issue_Identification: 79 Other_Citation_Details: pages 142-189 Online_Linkage: http://archives.datapages.com/data/sepm_sp/SP79/Depositional_Architecture_of_the_Lagniappe_Delta.pdf Cross_Reference: Citation_Information: Originator: Rogers, B.E., Kulp, M.A., and Miner, M.D. Publication_Date: 2009 Title: Late Holocene chronology, origin, and evolution of the St. Bernard shoals, northern Gulf of Mexico, USA Series_Information: Series_Name: Geo-Marine Letters Issue_Identification: 29 Other_Citation_Details: pages 379-394 Online_Linkage: http://link.springer.com/article/10.1007/s00367-009-0162-6 Cross_Reference: Citation_Information: Originator: Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G. Publication_Date: 2009 Title: Archive of digitized analog boomer seismic reflection data collected from the Mississippi-Alabama-Florida shelf during cruises onboard the R/V Kit Jones, June 1990 and July 1991 Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 429 Other_Citation_Details: 2009a Online_Linkage: https://pubs.usgs.gov/ds/429/ Cross_Reference: Citation_Information: Originator: Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G. Publication_Date: 2009 Title: Archive of digitized analog boomer and minisparker seismic reflection data collected from the Alabama-Mississippi-Louisiana shelf during cruises onboard the R/V Carancahua and R/V Gyre, April and July, 1981 Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 428 Other_Citation_Details: 2009b Online_Linkage: https://pubs.usgs.gov/ds/428/ Cross_Reference: Citation_Information: Originator: Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G. Publication_Date: 2009 Title: Archive of digitized analog boomer collected from Lake Pontchartrain, Louisiana, to Mobile Bay, Alabama, during cruises onboard the R/V ERDA-1, June and August 1992 Series_Information: Series_Name: U.S. Geological Survey Data Series Issue_Identification: 370 Other_Citation_Details: 2009c Online_Linkage: https://pubs.usgs.gov/ds/370/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The validity or accuracy of sonic boomer profiling data 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: As the seismic reflection data were acquired, the position of the vessel was recorded using a LORAN-C system. The accuracy of the LORAN-C varied from 528 to 1,320 feet (ft), with repeatable accuracy between 60 and 300 ft. Positions were recorded in latitude and longitude coordinates every 5 minutes and appear on the seismic profiles as incremental, hand-annotated vertical event marks. Navigation data were obtained as .dat files and saved as tab-delimitated text files. 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 local sea level at the time of data acquisition. Lineage: Process_Step: Process_Description: Raw Data Scanning - The seismic data collected during each survey is currently located in the SPCMSC archives and arranged in cruise-specific storage boxes. The analog boomer data is in the form of 50 centimeter (cm)-wide paper rolls, paper fan-folds, and vellum rolls. The various rolls can be up to 20 m long and contain multiple seismic tracklines. The rolls contain the seismic profile image with pertinent collection characteristics annotated during acquisition, such as shot number and time and may also include environmental conditions and equipment details. Horizontal lines across the profiles represent two-way travel time in milliseconds (ms), and vertical lines represent navigation fixes acquired and annotated as the survey was underway. The raw data was scanned on a Contex SD 3600 continuous-feed scanner. Using the NEXTimage 4 program (Contex), the scans were saved as 8-bit grey-scale TIFF files at 300 dots-per-inch (dpi) resolution. In order to minimize the final image file size for archiving, a batch conversion program was used to reduce the resolution to 210 dpi. The raw navigation data were imported into Esri ArcGIS version 10.3 as point data, converted to lines using the “make polylines from points” tool from the XTools Pro toolbar, and the attribute table was annotated with the cruise year. Source_Used_Citation_Abbreviation: TIFF Process_Date: 2016 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@usgs.gov Process_Step: Process_Description: Cropping - The scanned TIFF images were imported into Adobe Photoshop (Ps) Creative Cloud 2015 and blank edge areas were cropped out to further reduce file size. For rolls that included more than one line of seismic data, the file was separated into individual lines. Separation was completed by cropping everything except for the line of interest, determined by the raw navigation information, from the original scan and saving it as a new file with its associated line name. The file naming convention is as follows: CruiseID-DataAssociation_trackline#.tif (for example, A87-2-SEGY_4.tif). It includes the cruise identification (A87-2), data association(PWH [profiles with headers] or SEGY), and trackline number (sometimes this also includes a subsection letter after the line number for tracklines split between multiple rolls). Source_Used_Citation_Abbreviation: TIFF Process_Date: 2016 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@usgs.gov Process_Step: Process_Description: Headers - Each image of the scanned seismic profiles also includes a header with associated information including cruise- and line-specific information and processing details. The header files were created in Microsoft Word 2010, exported as PDF files, appended to the far left of the image frame in Adobe Photoshop, and then flattened onto the image to reduce file size. The final R/V Acadiana TIFF images with attached header files are available for download from the data release (Bosse and others, 2017). Process_Date: 2016 Source_Produced_Citation_Abbreviation: CruiseID-PWH_trackline#.tif Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@usgs.gov Process_Step: Process_Description: Correcting Scan Distortion - When scanning the vellum rolls, it was very difficult to ensure that the paper fed through the scanner perfectly straight. As a result, when the scanned file was brought into Adobe Photoshop, a straight reference line was placed over the 0 ms line (water level) on the scan. It is important that horizontal lines are perpendicular to the vertical lines on the scans or the image to SEG-Y conversion will not be accurate. The distortion was corrected by using the Rectangular Marquee Tool in Adobe Photoshop to select and create a new layer of the distorted area of the scan. A skewed transform was performed and the corrected images were saved into a new folder without layers (flattened) to reduce file size. Source_Used_Citation_Abbreviation: TIFF Process_Date: 2016 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@usgs.gov Process_Step: Process_Description: Image to SEG-Y - The scanned, distortion-corrected images were converted to digital SEG-Y (.seg) format (revision 0) (Barry and others, 1975) using the proprietary software ImageToSEGY 2.2 (Chesapeake Technology). The scanned images were opened in ImageToSEGY and the export area was defined by assigning values to the top, bottom, left, and right pixel locations using the imaged water surface (0 ms), maximum two-way travel time (for example 112.5 ms) and raw navigation data for each line. Trace amplitudes in the scanned profiles are represented by pixels, so each pixel becomes a trace sample and the sample rate of the converted SEG-Y version is the record length divided by the number of vertical pixels in the profile. For example, if the profile is 4,435 pixels vertically and the two-way travel time is 112.5 ms, then the sample rate for the SEG-Y file version is 0.000025 s. Source_Used_Citation_Abbreviation: SEG Process_Date: 2016 Source_Produced_Citation_Abbreviation: CruiseID-SEGY_trackline#.seg Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@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: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0197898265 Longitude_Resolution: 0.0226500333 Geographic_Coordinate_Units: Decimal seconds Geodetic_Model: Horizontal_Datum_Name: North American Datum 1983 Ellipsoid_Name: GRS_1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Acadiana_872_CruiseTracklines.shp Entity_Type_Definition: Shapefile containing seismic profile data Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: FID Attribute_Definition: Feature ID 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: Polyline Attribute: Attribute_Label: Line_id Attribute_Definition: Trackline or profile identifier Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Character string representing unique cruise ID and track line number Attribute: Attribute_Label: Year Attribute_Definition: The year the cruise study was conducted Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1987 Range_Domain_Maximum: 1987 Detailed_Description: Entity_Type: Entity_Type_Label: Navigation_A872.txt Entity_Type_Definition: Text file containing navigation data Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: Long Attribute_Definition: Longitude (NAD83) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -89.3240 Range_Domain_Maximum: -88.1160 Attribute_Units_of_Measure: Decimal Degrees Attribute: Attribute_Label: Lat Attribute_Definition: Latitude (NAD83) Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 29.1042 Range_Domain_Maximum: 30.2467 Attribute_Units_of_Measure: Decimal Degrees Attribute: Attribute_Label: Shot Attribute_Definition: A fixed point along the trackline Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0000 Range_Domain_Maximum: 2355 Attribute: Attribute_Label: Time Attribute_Definition: The time each shot was taken, in military time Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0000 Range_Domain_Maximum: 2355 Attribute: Attribute_Label: JD Attribute_Definition: Julian Calendar Day Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 166 Range_Domain_Maximum: 177 Attribute: Attribute_Label: Line_id Attribute_Definition: Trackline or profile identifier Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: Character string representing unique cruise ID and track line number Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen T. Bosse 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: sbosse@usgs.gov Contact_Instructions: This report is available online. The SEG-Y files are downloadable from the Coastal and Marine Geoscience Data System. Resource_Description: A87-2-SEGY_*.seg, A87-2-PWH_*.tif, Navigation_A87-2.txt, Acadiana_872_CruiseTracklines.shp Distribution_Liability: This 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, TIFF 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: Unzip Transfer_Size: 8800 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://coastal.er.usgs.gov/data-release/doi-F7F47MC2/data/SEGY_A87-2.zip Network_Resource_Name: http://coastal.er.usgs.gov/data-release/doi-F7F47MC2/data/Profileswithheaders_A87-2.zip Digital_Form: Digital_Transfer_Information: Format_Name: SHP, TXT Format_Information_Content: The GIS project used to create the trackline map includes an Esri shapefile and metadata. Map documents (not included) were created with Esri ArcGIS 10.3 software. The provided shapefile 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: 0.048 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://coastal.er.usgs.gov/data-release/doi-F7F47MC2/data/Navigation_A87-2.zip Network_Resource_Name: http://coastal.er.usgs.gov/data-release/doi-F7F47MC2/data/CruiseTracklines_A87-2.zip Fees: None, if obtained online; otherwise, prices vary. 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: Stephen T. Bosse 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: sbosse@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998