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U.S. Geological Survey Data Series 772
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- Data_Quality_Information
- Spatial_Data_Organization_Information
- Spatial_Reference_Information
- Entity_and_Attribute_Information
- Distribution_Information
- Metadata_Reference_Information
- 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: Tabular, vector, and         raster digital 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/> 
  - 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 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 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: 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: ISO 19115 Topic Category
      - Theme_Keyword: geoscientificinformation
      - Theme_Keyword: oceans 
    - Theme:       
    -        - Theme_Keyword_Thesaurus: None 
      - Theme_Keyword: Geology
      - Theme_Keyword: Coastal information
      - Theme_Keyword: Marine
      - Theme_Keyword: Subbottom profile
      - Theme_Keyword: Seismic reflection
      - Theme_Keyword: Chirp
      - Theme_Keyword: Society of Exploration Geophysicists
      - Theme_Keyword: SEG Y
      - Theme_Keyword: Barrier Island Mapping
      - Theme_Keyword: 11BIM01 
    - 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:       
    - Figure 1. Location map 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:       
    - Figure 3. Area 1 detailed trackline map of digital chirp subbottom       data collected during USGS Field Activity 11BIM01. This map was created at       a scale of 1:31,865. 
    - 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:       
    - Figure 4. Area 2 detailed trackline map of digital chirp subbottom       data collected during USGS Field Activity 11BIM01. This map was created at       a scale of 1:29,145. 
    - 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:       
    - Figure 5. Area 3 detailed trackline map of digital chirp subbottom       data collected during USGS Field Activity 11BIM01. This map was created at       a scale of 1:41,370. 
    - 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:       
    - Figure 6. Area 4 detailed trackline map 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:       
    - Figure 7. Area 5 detailed trackline map of digital chirp subbottom       data collected during USGS Field Activity 11BIM01. This map was created at       a scale of 1:39,700. 
    - 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:       
    - Figure 8. Area 6 detailed trackline map of digital chirp subbottom       data collected during USGS Field Activity 11BIM01. This map was created at       a scale of 1:50,200. 
    - 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. 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. 
  - 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, 11c10 and 11c10_a).         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 comma-delimited text files (for use with ESRI         software); one containing unique shotpoint positions (11bim01.txt),         another containing the 1,000-shot-interval locations (s11bim01.txt) and         the last containing start of line locations (11bim01_s), which 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 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 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: 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 
- 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. 
- 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://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  <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: 29.41 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 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 MB 
      - 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: 20120620
  - 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 
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