In September and October of 2003, the U.S. Geological Survey (USGS), in cooperation with the Florida Geological Survey, conducted geophysical surveys of the Atlantic Ocean offshore northeast Florida from St. Augustine, Florida, to the Florida-Georgia border. This report serves as an archive of unprocessed digital boomer subbottom profile data, trackline maps, navigation files, Geographic Information System (GIS) information, Field Activity Collection System (FACS) logs, and formal Federal Geographic Data Committee (FGDC) metadata. Filtered and gained (a relative increase in signal amplitude) digital images of the seismic profiles are also provided.
Purpose:
To archive all digital boomer subbottom profile data collected during cruises 03FGS01 and 03FGS02 and associated files.
Supplemental_Information:
The USGS St. Petersburg Coastal and Marine Science Center (SPCMSC) in Florida assigns a unique identifier to each cruise or field activity. For example, 03FGS01 tells us the data were collected in 2003 as part of cooperative work with the Florida Geological Survey (FGS) and that the data were collected 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 field activity ID. The naming convention used for each seismic 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, b for boomer), '##' 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.
The boomer plate is an acoustic energy source that consists of capacitors charged to a high voltage and discharged through a transducer in the water. The transducer is towed on a sled floating on the water surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water, sediment column, or rock beneath. The acoustic energy is reflected at density boundaries (such as the seafloor, sediment, or rock layers beneath the seafloor), detected by the hydrophones, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (for example, 0.5 seconds) and recorded for specific intervals of time (for example, 100 milliseconds). In this way, a two-dimensional (2-D) vertical profile of the shallow geologic structure beneath the ship track is produced.
For both cruises, a C-Products C-Boom power supply provided 100 -110 joules per shot. Reflected energy was received by a Benthos MESH streamer and recorded by Triton Elics International, Inc. (TEI) Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced every 12 inches. Refer to the handwritten FACS operation log included with this archive for diagrams and descriptions of acquisition geometry, which varied throughout the cruises. The sample frequency of the data is 20-24 kilohertz, the record length is 100 milliseconds, and the shot rate was every 0.5 seconds. Shot spacing was approximately every 1 meter.
The binary portion of the unprocessed seismic data are stored in SEG Y (rev. 0), integer, Motorola format, which is a standard digital format that can be read and manipulated by all seismic processing software packages (Barry and others, 1975), with the exception of the first 3,200 bytes of the card image header, which are stored in ASCII format instead of the standard EBCDIC format. The SEG Y formatted trace files have a .tra extension. Additional recording parameters for each trace file can also be found in the .par file associated with each .tra file. However, the .par and .pln files included here are needed only to process or display the data with TEI Delph Seismic software. The SEG Y files may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2005). 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 500 shots, and produce a printable, gained GIF image of each profile. The printable profiles provided here are GIF images that were filtered and gained using SU software. Refer to the Software page for links to example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992).
The SEG Y files are available on the DVD version of this report or on the Web, downloadable via the USGS Coastal and Marine Geoscience Data System (http://cmgds.marine.usgs.gov). The data is also available for viewing using GeoMapApp (http://www.geomapapp.org) and Virtual Ocean (http://www.virtualocean.org) multi-platform open source software.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20030922
Ending_Date: 20031022
Currentness_Reference: Data collection interval
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.382166
East_Bounding_Coordinate: -81.116332
North_Bounding_Coordinate: 30.709674
South_Bounding_Coordinate: 29.883766
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Geology
Theme_Keyword: Coastal Information
Theme_Keyword: Marine Subbottom Profile
Theme_Keyword: Boomer
Theme_Keyword: Society of Exploration Geophysicists
Theme_Keyword: SEG Y
Theme_Keyword: Florida Geological Survey
Theme_Keyword: 03FGS01
Theme_Keyword: 03FGS02
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Content Characterization
Place_Keyword: Atlantic Ocean
Place_Keyword: United States of America
Place_Keyword: Florida
Place_Keyword: Tolomato River
Place_Keyword: St. Augustine Inlet
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The USGS and FGS request to be acknowledged as originators of the data in future products or derivative research.
Trackline map of digital boomer subbottom profile data collected during USGS cruises 03FGS01 and 03FGS02. This map was created at a scale of 1:750,000. Refer to the Lineage section below for the trackline map creation process.
Trackline map of digital boomer subbottom profile data collected in Area A (refer to the full survey area map) during USGS cruises 03FGS01 and 03FGS02. This map was created at a scale of 1:200,000. Refer to the Lineage section below for the trackline map creation process.
Trackline map of digital boomer subbottom profile data collected in Area B (refer to the full survey area map) during USGS cruises 03FGS01 and 03FGS02. This map was created at a scale of 1:200,000. Refer to the Lineage section below for the trackline map creation process.
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Funding and (or) support for this study was provided by the USGS CMGP and the Florida Geological Survey (FGS). We thank R/V Geoquest captain Wade Stringer of the FGS for his assistance in data collection and Janice A. Subino (contracted with Jacobs Technology, Inc., at the SPCMSC) for her assistance in the preparation of this document. This document was also improved by the reviews of Jack Kindinger (SPCMSC) and Barbara Poore (SPCMSC).
Trackline map creation: The trackline maps provided in this archive were created using ESRI ArcGIS 8.3 and 10 GIS software, exported to Adobe Illustrator for further editing, and saved in JPEG format. The cities and states layers are St. Johns River Water Management District (SJRWMD) data sets. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The USGS is the originator of all other layers.
Source_Used_Citation_Abbreviation: SJRWMD and ESRI
Process_Date: 2004
Source_Produced_Citation_Abbreviation: all.mxd, area_a.mxd, and area_b.mxd
Source_Produced_Citation_Abbreviation: all.jpg, area_a.jpg, and area_b.jpg
Data Series preparation: In addition to the process steps above, the following steps were taken to produce this Data Series: the handwritten logs were scanned and saved as PDF files, digital FACS logs were created using the handwritten 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.
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: Lon
Attribute_Definition: Longitude (decimal degrees)
Attribute_Definition_Source: World Geodetic System 1984 Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -81.382166
Range_Domain_Maximum: -81.116332
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: 30.709674
Range_Domain_Maximum: 29.883766
Attribute:
Attribute_Label: Line
Attribute_Definition: Trackline number
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Individual line names: test1 - t1.
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: 20000
Attribute:
Attribute_Label: UTMX
Attribute_Definition: UTM-X coordinate (Zone 17N)
Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 463383
Range_Domain_Maximum: 488780
Attribute:
Attribute_Label: UTMY
Attribute_Definition: UTM-Y coordinate (Zone 17N)
Attribute_Definition_Source: Universal Transverse Mercator Geographic Coordinate System
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3305925
Range_Domain_Maximum: 3397467
Attribute:
Attribute_Label: YEAR
Attribute_Definition: Year (in YYYY format)
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2003
Range_Domain_Maximum: 2003
Attribute:
Attribute_Label: DOY:HR:MIN:SEC
Attribute_Definition: Day of year and Time (GMT)
Attribute_Definition_Source: Coordinated Universal Time
Attribute_Domain_Values:
Unrepresentable_Domain: Date and time in GMT format (day of year:hour:minute:second)
Overview_Description:
Entity_and_Attribute_Overview:
Binary data file: Trace data are available as binary files in SEG Y format. These files have a .tra extension and measure 1.3 to 96.1 megabytes. To access these files please go to https://pubs.usgs.gov/ds/670/segy/.
Entity_and_Attribute_Overview:
Graphic image file: Printable profiles are available as GIF images. The trackline maps are JPEG images. The trackline maps contain links to the printable seismic profile GIF images. To access these files please go to https://pubs.usgs.gov/ds/670/profiles/printable.
Entity_and_Attribute_Overview:
Navigation file: Navigation files are available as comma delimited ASCII text files; to access these files please go to https://pubs.usgs.gov/ds/670/nav. Provided are raw (unprocessed) shotpoint navigation files, processed shotpoint navigation files, and processed 500-shot-interval location files. Fields/Attributes [FID, Shape] marked above with an asterisk (*) were created by ESRI ArcGIS software and are used exclusively by the shapefiles created from the aforementioned text files; these fields are not included in the original navigation files. All remaining attributes listed in the above section that do not have an accompanying asterisk are found in 03fgs01.txt, 03fgs02.txt, s03fgs01.txt, and s03fgs02.txt.
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. To access these files please go to https://pubs.usgs.gov/ds/670/software/arc
Cohen, J.K., and Stockwell, J.W., Jr., 2005, CWP/SU: Seismic Unix Release 39: A free package for seismic research and processing: Golden, Colo, Center for Wave Phenomena, Colorado School of Mines. Available online at http://www.cwp.mines.edu/cwpcodes/.
Entity_and_Attribute_Detail_Citation:
Zihlman, F.N., 1992, DUMPSEGY v.1.0: A program to examine the contents of SEG Y disk-image seismic data: U.S. Geological Survey Open-File Report 92-590, 28 p. Available online at https://pubs.usgs.gov/of/1992/0590/report.pdf.
Entity_and_Attribute_Detail_Citation:
Disc Image Credit: Descloitres, J., MODIS Land Rapid Response Team at the NASA Goddard Space flight Center, 2003, Florida. A2003044.jpg. Available online at http://visibleearth.nasa.gov.
Resource_Description: U.S. Geological Survey Data Series 670
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
Format_Information_Content:
The SEG Y files on this disc conform to the SEG Y standard format (Barry and others, 1975), with the exception of the 3,600-byte reel identification header that is in ASCII format. Standard SEG Y uses an EBCDIC 3,600-byte reel identification header.
File_Decompression_Technique: None
Transfer_Size: 1.6 gigabytes
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 using ESRI ArcView 3.3 and ArcGIS 8.3 and 10 GIS software. The shapefiles provided may also be viewed using other versions of ArcView, ArcGIS, or public-domain software ArcExplorer (http://www.ESRI.com/software/arcexplorer/) or GeoMapApp (http://www.geomapapp.org), which are compatible with all platforms.
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/).
