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95LCA03 and 96LCA02 Data Archive
Link to Southwest Florida Water Management District home page.

FGDC Metadata


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Identification_Information:
Citation:
Citation_Information:
Originator: Karynna Calderon
Originator: Shawn V. Dadisman
Originator: Ann B. Tihansky
Originator: Bill R. Lewelling
Originator: James G. Flocks
Originator: Dana S. Wiese
Originator: Jack L. Kindinger
Originator: Arnell S. Harrison
Publication_Date: 2005
Title:
Archive of Digital Boomer Seismic Reflection Data Collected During USGS Field Activities 95LCA03 and 96LCA02 in the Peace River of West-Central Florida, 1995 and 1996
Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section
Series_Information:
Series_Name: U.S. Geological Survey Data Series
Issue_Identification: DS 217
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
Description:
Abstract:
In October and November of 1995 and February of 1996, the U.S. Geological Survey, in cooperation with the Southwest Florida Water Management District, conducted geophysical surveys of the Peace River in west-central Florida from east of Bartow to west of Arcadia. This report serves as an archive of unprocessed digital boomer seismic reflection data, trackline maps, navigation files, GIS files, Field Activity Collection System (FACS) logs, observers' logbooks, and formal FGDC metadata. Filtered and gained digital images of the seismic profiles are also provided.

The archived trace data are in standard Society of Exploration Geophysicists (SEG) SEG-Y 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.

Purpose:
The data archived here were collected as part of the USGS Lakes and Coastal Aquifers (LCA) Project. The main objectives were: 1) to determine if a geologic model of the Peace River could be constructed from geophysical data collected in a shallow riverine environment, and 2) to extend those findings to a study of the hydraulic connection between the Peace River basin and the underlying aquifer systems. For further information about this study refer to Lewelling and others (1998).
Supplemental_Information:
The USGS Florida Integrated Science Center (FISC) - St. Petersburg assigns a unique identifier to each cruise or field activity. For example, 95LCA03 tells us the data were collected in 1995 for the Lakes and Coastal Aquifers (LCA) Project and the data were collected during the third 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 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 at the sea surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water and sediment column. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), detected by a receiver, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (e.g., 0.5 s) and recorded for specific intervals of time (e.g., 100 ms). In this way, a two-dimensional vertical image of the shallow geologic structure beneath the ship track is produced.

For both field activities, an ORE GeoPulse power supply provided 105 joules per shot. Reflected energy was received by an Innovative Transducers, Inc. (ITI) ST-5 streamer and recorded by Delph acquisition software. The streamer contains ten hydrophones evenly spaced over a length of 6 m (every 2 feet). Acquisition geometry and phones used varied throughout the field activites. Refer to figure 1 and the operations logbooks included with this archive (Data Series 217) for more detail. The sample frequency of the data is 12 kHz. Record length is 100 ms for 95LCA03 and 125 ms for 96LCA02. The shot rate for both field activities was every 0.5 s, and shot spacing is approximately every 2 m.

The unprocessed seismic data are stored in SEG-Y, integer, Motorola format, which is a standard digital format that can be read and manipulated by most seismic processing software packages (Barry and others, 1975). 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 only needed to process or display the data with Delph Seismic software. Also provided are example Seismic Unix 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 filtered and gained GIF image of each profile.

The printable profiles provided here are GIF images that were filtered and gained using Seismic Unix software. The processed SEG-Y data were then exported to Chesapeake Technology, Inc. (CTI) SonarWeb software to produce an interactive version of the profile that allows the user to obtain a geographic location and depth from the profile for a curser position. This information is displayed in the status bar of the browser. Warning! The only supported web browsers that properly display all features of the interactive profiles are Internet Explorer 6 for Windows and Firefox 1.5 for all platforms. For all browsers, the status bar and JavaScript must be enabled. Firefox also requires "Change status bar text" to be checked under Advanced JavaScript Options. Caution–other browsers may result in spurious or no information given in the status window. Firefox may be downloaded at http://www.mozilla.org/products/firefox.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19951031
Ending_Date: 19960229
Currentness_Reference: Data collection interval
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.890362
East_Bounding_Coordinate: -81.778989
North_Bounding_Coordinate: 27.903920
South_Bounding_Coordinate: 27.217428
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: marine seismic reflection
Theme_Keyword: boomer
Theme_Keyword: SEG-Y
Theme_Keyword: 95LCA03
Theme_Keyword: 96LCA02
Theme_Keyword: Lakes and Coastal Aquifers
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Peace River
Place_Keyword: Florida
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The USGS and Southwest Florida Water Management District request to be acknowledged as originators of the data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: A. Tihansky
Contact_Organization: U.S. Geological Survey
Contact_Position: Hydrologist
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. 3075
Contact_Electronic_Mail_Address: tihansky@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: DVD/maps/cruisenav/all.jpg
Browse_Graphic_File_Description:
Location map of digital boomer seismic reflection data collected during USGS Field Activities 95LCA03 and 96LCA02. This map was created at a scale of 1:360,000. Refer to the Lineage section below for the trackline map creation process.
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: DVD/maps/cruisenav/area_a.jpg
Browse_Graphic_File_Description:
Trackline map of digital boomer seismic reflection data collected in Area A (refer to Area A of the full survey area map) during USGS Field Activity 95LCA03. This map was created at a scale of 1:75,000. Refer to the Lineage section below for the trackline map creation process.
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: DVD/maps/cruisenav/area_b.jpg
Browse_Graphic_File_Description:
Trackline map of digital boomer seismic reflection data collected in Area B (refer to Area B of the full survey area map) during USGS Field Activity 95LCA03. This map was created at a scale of 1:75,000. Refer to the Lineage section below for the trackline map creation process.
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: DVD/maps/cruisenav/area_c.jpg
Browse_Graphic_File_Description:
Trackline map of digital boomer seismic reflection data collected in Area C (refer to Area C of the full survey area map) during USGS Field Activities 95LCA03 and 96LCA02. This map was created at a scale of 1:75,000. Refer to the Lineage section below for the trackline map creation process.
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: DVD/maps/cruisenav/area_d.jpg
Browse_Graphic_File_Description:
Trackline map of digital boomer seismic reflection data collected in Area D (refer to Area D of the full survey area map) during USGS Field Activity 96LCA02. This map was created at a scale of 1:75,000. Refer to the Lineage section below for the trackline map creation process.
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: DVD/maps/cruisenav/area_e.jpg
Browse_Graphic_File_Description:
Trackline map of digital boomer seismic reflection data collected in Area E (refer to Area E of the full survey area map) during USGS Field Activity 96LCA02. This map was created at a scale of 1:75,000. 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 were provided by the USGS Coastal and Marine Geology Program and Water Resources Division and the Southwest Florida Water Management District. We thank Erik L. Staub of the USGS in Tampa, Florida, for his assistance in data collection. This document was improved by the reviews of Mark Hansen (USGS) and Julie C. Bernier (ETI Professionals, Inc., contracted by the USGS) at the FISC - St. Petersburg, Florida.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The validity or accuracy of marine seismic reflection 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:
These data are from two different field activities. Differences occur in navigation, acquisition equipment, and acquisition geometry between vessels and field activities. Horizontal accuracy varies with navigation equipment used, and signal-to-noise ratio of the data changes with hydrophone streamers used. However, for most purposes, the profile data are comparable for all systems used. Acquisition geometry and phones used varied throughout the field activites. Refer to figure 1 and the operations logbooks included with this archive (Data Series 217) for more detail.
Completeness_Report:
These data are collected along tracklines (2-D) and are therefore inherently incomplete. Geologic details between lines must be inferred. Only the upper 100 ms of a total 125 ms are displayed on the 95LCA03 printable profiles because little useful information was observed deeper in the sections. Several lines are missing navigation for the start and/or end of line. The navigation fix interval for 95LCA03 was about every 60 s, or about every 120 shots. Lines PRSB_5 and PRSB_6 are missing navigation for the first 120 shots or more. Line PRSB_2 is missing navigation for about the last 120 shots. The fix interval for 96LCA02 was about every 30 s, or about every 60 shots. Lines PR296_C, PR296_D, and PR296_G are missing navigation for the first 60 shots or more. On the trackline maps, a cross marks the location of the first available navigation fix for lines missing navigation at the start of line. Navigation is also intermittent for several 96LCA02 lines. On the trackline maps, the location of missing navigation data within a line is inferred by linear interpolation of the first and last known data points. A SonarWeb line navigation map is not available for 95LCA03 line PRSB_2 due to a lack of accurate navigation for that line.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
As the seismic reflection data were acquired, the position of the vessel was continuously determined by a Rockwell Collins PLGR GPS receiver, which is accurate within 3-5 m. Positions were recorded and written to the trace headers in latitude and longitude about every 60 s for 95LCA03 and about every 30-60 s for 96LCA02. The navigation files and trackline maps have not been corrected to reflect the offset between the shotpoint and GPS antenna. Figure 1 included with this archive (Data Series 217) displays acquisition geometry.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Boomer data are relative to sea level. However, varying recorded static shifts of the data have been known to occur. Therefore, these data are not to be used for bathymetry.
Lineage:
Process_Step:
Process_Description:
Boomer processing: Delph Seismic software was used to convert the original trace files for all lines from nonstandard ELICS format to standard SEG-Y format. The trace files for 95LCA03 line PRSB_11A and 96LCA02 lines PR296_B and PR296_E were divided into two or more trace files each (e.g., PRSB_11A became PRSB_11Aa and PRSB_11Ab) because the original total number of traces exceeded the maximum allowed by the processing software. The SEG-Y data were then processed with Seismic Unix to produce GIF images of the seismic profiles included in this report. A representative processing sequence consisted of: 1) Bandpass filter: 300-500-2500-3000 Hz, 2) Automatic gain control, 3) Postscript display, and 4) Conversion of Postscript image to GIF image. The processed SEG-Y data were then exported to CTI SonarWeb software to produce an interactive version of each profile that allows the user to obtain a geographic location and depth from the profile for a cursor position. Refer to the Supplemental Information section above for details on how to use the interactive profiles.
Process_Date: 2005
Process_Step:
Process_Description:
Navigation processing: Shotpoint navigation files and 500-shot-interval location files were extracted from the trace headers of each line using Seismic Unix software and edited to remove spurious data points and fix incorrectly recorded dates. These files were then processed with PROJ.4 software (http://www.remotesensing.org/proj) to generate Zone 17 UTMs from latitude and longitude and reformatted for use with Environmental Systems Research Institute (ESRI) GIS software.
Process_Date: 2005
Process_Step:
Process_Description:
Trackline map creation: The trackline maps provided in this archive were created with ESRI ArcGIS 9.0 software, exported to Adobe Illustrator for further editing, and saved in JPEG format. The maps are in geographic coordinates (unprojected, NAD83). The cities, roads, and counties layers are Southwest Florida Water Management District data sets. The USGS is the originator of all other layers. The Points to Lines ArcScript, downloadable at http://arcscripts.esri.com/details.asp?dbid=12702, was used to create the trackline layers. A map of trackline navigation for each seismic profile was also produced with CTI SonarWeb software.
Process_Date: 2005
Process_Step:
Process_Description:
Data Series preparation: In addition to the process steps described above, the following steps were taken to produce this archive: the handwritten logbooks were scanned and saved as PDF files, digital FACS logs were created using the handwritten logbooks 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: 2005

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Horizontal X and Y locations (latitude and longitude and Zone 17 UTMs) 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: 0.0000027
Longitude_Resolution: 0.0000027
Geographic_Coordinate_Units: decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:
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 range in size from 0.97 to 61.6 MB.
Entity_and_Attribute_Detail_Citation:
Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for digital tape formats: Geophysics, v. 40, n. 2, p. 344-352. Also available online at: http://www.seg.org/publications/tech-stand.
Entity_and_Attribute_Detail_Citation:
Lewelling, B.R., Tihansky, A.B., Kindinger, J.L., 1998, Assessment of the hydraulic connection between ground water and the Peace River, west-central Florida: U.S. Geological Survey Water Resources Investigations Report 97-4211, 96 p. Also available online at: http://fl.water.usgs.gov/Abstracts/wri97_4211_lewelling.html.
Entity_and_Attribute_Detail_Citation:
Zihlman, F.N., 1992, DUMPSEGY V1.0: A program to examine the contents of SEG-Y disk-image seismic data: U.S. Geological Survey Open-File Report 92-590, 28 p.
Entity_and_Attribute_Overview:
Graphic image file: Printable profiles are available as GIF images. Interactive profiles are HTML pages with accompanying JPEG images. The line navigation maps and trackline maps are JPEG images. The trackline maps contain links to the line navigation maps and seismic profile images.
Entity_and_Attribute_Overview:
Navigation file: Navigation files are available as ASCII text files. Provided are unedited (raw) navigation files, edited navigation files, and edited 500-shot-interval location files.
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.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: S. Dadisman
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. 3029
Contact_Electronic_Mail_Address: sdadisman@usgs.gov
Contact_Instructions:
Data may be available on-line only by special arrangement with the distributor above.
Resource_Description: U.S. Geological Survey Data Series 217
Distribution_Liability:
This DVD publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein 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.

Although all data and software published on this disc have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.

Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SEG-Y
Format_Information_Content:
The SEG-Y standard format (Barry and others, 1975) 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: 520 MB
Digital_Transfer_Option:
Offline_Option:
Offline_Media: DVD
Recording_Format: ISO 9660
Compatibility_Information: Macintosh, Linux, UNIX, DOS
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 9.0 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/index.html).
File_Decompression_Technique: unzip
Transfer_Size: 39.5 MB
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: DVD/software/arc/arc.zip
Fees:
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: 20060907
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: A. Harrison
Contact_Organization: U.S. Geological Survey
Contact_Position:
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: aharrison@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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