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