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FGDC FORMAL SEISMIC METADATA

• Identification_Information
• 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: Karynna Calderon

Originator: Shawn V. Dadisman

Originator: Jack L. Kindinger

Originator: S. Jeffress Williams

Originator: James G. Flocks

Originator: Shea Penland

Originator: Dana S. Wiese

Publication_Date: 2003

Title:

Archive of Digital Boomer Seismic Reflection Data Collected During USGS Cruises 94GFP01, 95GFP01, 96GFP01, 97GFP01, and 98GFP02 in Lakes Pontchartrain, Borgne, and Maurepas, Louisiana, 1994-1998

Geospatial_Data_Presentation_Form: Seismic Reflection Profile Section

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report

Issue_Identification: 03-497

Publication_Information:

Publication_Place: St. Petersburg, FL

Publisher: U.S. Geological Survey

Description:

Abstract:

The U.S. Geological Survey, in cooperation with the University of New Orleans, the Lake Pontchartrain Basin Foundation, the National Oceanic and Atmospheric Administration, the Coalition to Restore Coastal Louisiana, the U.S. Army Corps of Engineers, the Environmental Protection Agency, and the University of Georgia, conducted five geophysical surveys of Lakes Pontchartrain, Borgne, and Maurepas in Louisiana from 1994 to 1998. This report serves as an archive of unprocessed digital boomer seismic reflection data, trackline maps, navigation files, observers' logbooks, GIS information, and formal FGDC metadata. In addition, a filtered and gained GIF image of each seismic profile is 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). Examples of SU processing scripts and in-house (USGS) software for viewing SEG-Y headers (Zihlman, 1992) are also provided. Processed profile images, trackline maps, navigation files, Field Activity Collection System (FACS) logs, and formal metadata may be viewed with a web browser, and scanned handwritten logbooks may be viewed with Adobe Reader.

Purpose:

The data archived here were collected as part of a Lake Pontchartrain Basin Geologic Framework and Coastal Processes Study. This work was part of a multidisciplinary evaluation of the geology, geomorphology, coastal processes, and environmental quality of the Lake Pontchartrain Basin. This study is part of the USGS Geologic Framework and Processes (GFP) Project. For further information about this study, refer to <http://coastal.er.usgs.gov/pontchartrain>.

Supplemental_Information:

The USGS Florida Integrated Science Center (FISC) - Coastal and Watershed Studies in St. Petersburg, Florida, assigns a unique identifier to each cruise or field activity. The method used to assign the identifier for the activity is as follows: YYPPP##, where YY stands for the last 2 digits of the year in which the fieldwork is conducted, PPP is a 3-letter abbreviation for the project the data are collected for, and ## is a 2-digit event tag that represents a discreet leg or time period of fieldwork. For example, 94GFP01 indicates the data were collected in 1994 for the Geologic Framework and Processes Project and that the data were collected during the first field activity for that project in that calendar year.

The boomer energy source consists of capacitors that are charged to a high voltage and then discharged through a transducer in the water. The transducer is towed on a sled at the sea surface and 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 the receiver, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (e.g., 500 ms) 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.

The transducer provided 65 joules (J) per shot for 95GFP01, 135 J for 96GFP01, 105 or 208 J for 97GFP01, and 100 J for 98GFP02. The power level used for 94GFP01 is not known. For all cruises, reflected energy was received by an ITI ST-5 streamer and recorded by Triton Elics Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced over a length of 6 m. Only data received by elements 4-8 were summed for 96GFP01, 3-8 for 97GFP01, and 5-8 for 98GFP02. It is unknown which hydrophones were used for 94GFP01 and 95GFP01. The streamer was positioned parallel to the boomer sled and laterally separated from it by about 7 m. The sample frequency of the data was 10-12 kHz for 94GFP01, 12 kHz for 95GFP01, 16 kHz for 96GFP01, and 12 kHz for 97GFP01 and 98GFP02. Trace length for all tracklines was 100 ms. Based on survey speeds of 3.5 - 4 knots and a shot rate of every 0.25 s, the shot spacing was about 0.5 m.

Digital data were not recorded for 94GFP01 lines PON531_1 and LINE_9A and 96GFP01 line pon96_8. No data were collected for 95GFP01 line SBP_A1 and 98GFP02 lines lasi_16 and lasi_48a - lasi_54. The original trace files for 94GFP01 lines PON531_2, PON61_1, PON62_1, PON62_3, LINE_7, LINE_10, LINE_14, LINE_17, LINE_18, and LINE_20; 96GFP01 lines pon96_6, pon96_9, and pon96_24; and 97GFP01 lines pon97_1, pon97_12, pon97_16, and pon97_17 were divided into two or more trace files (e.g., LINE_7 became LINE_7a and LINE_7b) because the original total number of traces exceeded the maximum allowed by the processing system.

The unprocessed seismic data were stored in SEG-Y 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 file format includes a 3,200-byte descriptive header that contains detailed information regarding the data acquisition and processing parameters. All data presented here are stored in SEG-Y, integer, Motorola 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 only needed to process or display the data with Triton Elics Delph Seismic software. The SEG-Y data files are too large to fit on one disc, so they have been distributed onto two DVDs with the SEG-Y files for 94GFP01, 95GFP01, and 96GFP01 on Disc 1 and the SEG-Y files for 97GFP01 and 98GFP02 on Disc 2.

Also included on these discs 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. These images can then be displayed using a variety of shareware programs such as ImageMagick (Unix, Linux) or a web browser.

For 94GFP01 and 95GFP01, DGPS navigation was provided to the acquisition system about every 60 s by a Trimble Nav Trac/Nav Beacon XL DGPS receiver. For 96GFP01 and 97GFP01, GPS navigation was provided to the acquisition system by a Rockwell PLGR GPS receiver. This was done about every 60 s for 96GFP01 and about every 2 s for 97GFP01. For 98GFP02, GPS navigation was provided to the acquisition system about every 2 s by a Trimble Nav Graphics GPS receiver. The accuracy of all receivers used is within 15 m. The data required some editing to remove spurious data points and fix incorrectly recorded dates. The edited results were used to generate the trackline maps presented here. The navigation data have not been corrected to reflect the 20-m offset between the shotpoint and GPS antenna. Position fixes for every 500 shots and for the start of lines are also provided as an aid for registering of the data after plotting. All navigation files are stored as ASCII text files.

The trackline maps provided in this archive are set in geographic coordinates, NAD83 (unprojected). They were created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. These JPEG images are viewable with a web browser. Also included on these discs are the ArcView map documents and shapefiles used to create the trackline maps presented here. The map documents, created with ArcView 8.1, are compatible with ArcGIS 8.1 (Windows). The shapefiles, created with ArcView 3.2 and 8.1, may be viewed using other versions of ArcView or public domain software ArcExplorer 2.0 (Windows) and 4.0 (Windows, Mac OS X, Unix, Linux), available from the ESRI website at <http://www.esri.com/software/arcexplorer/index.html>.

FACS logs are available in both HTML and Rich Text Format. Scanned versions of the handwritten logbooks are provided as PDF files.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1994

Ending_Date: 1998

Currentness_Reference: Data collection interval

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -90.536928

East_Bounding_Coordinate: -89.391950

North_Bounding_Coordinate: 30.380518

South_Bounding_Coordinate: 29.865900

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: marine seismic reflection

Theme_Keyword: boomer

Theme_Keyword: SEG-Y

Theme_Keyword: 94GFP01

Theme_Keyword: 95GFP01

Theme_Keyword: 96GFP01

Theme_Keyword: 97GFP01

Theme_Keyword: 98GFP02

Theme_Keyword:

Lake Pontchartrain Basin Geologic Framework and Coastal Processes Study

Theme_Keyword: Geologic Framework and Processes Project

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Louisiana

Place_Keyword: Lake Pontchartrain

Place_Keyword: Lake Borgne

Place_Keyword: Lake Maurepas

Place_Keyword: Pass Manchac

Place_Keyword: Chef Menteur Pass

Place_Keyword: The Rigolets

Access_Constraints: None. These data are held in the public domain.

Use_Constraints:

The U.S. Geological Survey requests to be acknowledged as the originator of the data in future products or derivative research.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jack L. Kindinger

Contact_Organization: U.S. Geological Survey

Contact_Position: Oceanographer

Contact_Address:

Address_Type: mailing address

Address: 600 Fourth Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: (727) 803-8747, ext. 3018

Contact_Electronic_Mail_Address: jkindinger@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/all.jpg

Browse_Graphic_File_Description:

Trackline map of all boomer seismic reflection data collected during USGS Cruises 94GFP01, 95GFP01, 96GFP01, 97GFP01, and 98GFP02. These data were collected in Lakes Pontchartrain, Borgne, and Maurepas in Louisiana between 1994 and 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:680,500. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/Environmental Systems Research Institute (ESRI) data set. The state layer is an ESRI data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94.jpg

Browse_Graphic_File_Description:

Trackline map of all boomer seismic reflection data collected during USGS Cruise 94GFP01. These data were collected in Lakes Pontchartrain and Maurepas in Louisiana in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:470,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/95.jpg

Browse_Graphic_File_Description:

Trackline map of all boomer seismic reflection data collected during USGS Cruise 95GFP01. These data were collected in Lakes Pontchartrain and Borgne in Louisiana in July of 1995. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:470,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/96.jpg

Browse_Graphic_File_Description:

Trackline map of all boomer seismic reflection data collected during USGS Cruise 96GFP01. These data were collected in Lakes Pontchartrain and Borgne in Louisiana in September of 1996. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:470,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/97.jpg

Browse_Graphic_File_Description:

Trackline map of all boomer seismic reflection data collected during USGS Cruise 97GFP01. These data were collected in Lakes Pontchartrain and Borgne in Louisiana in August of 1997. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:470,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98.jpg

Browse_Graphic_File_Description:

Trackline map of all boomer seismic reflection data collected during USGS Cruise 98GFP02. These data were collected in Lake Pontchartrain, Louisiana, in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:470,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94a.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 94GFP01 Area A (refer to Area A of the 94GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 94GFP01 in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94b.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 94GFP01 Area B (refer to Area B of the 94GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 94GFP01 in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94c.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 94GFP01 Area C (refer to Area C of the 94GFP01 map) of Lakes Pontchartrain and Maurepas in Louisiana during USGS Cruise 94GFP01 in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94d.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 94GFP01 Area D (refer to Area D of the 94GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 94GFP01 in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94e.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 94GFP01 Area E (refer to Area E of the 94GFP01 map) of Lakes Pontchartrain and Maurepas in Louisiana during USGS Cruise 94GFP01 in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/94f.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 94GFP01 Area F (refer to Area F of the 94GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 94GFP01 in June of 1994. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/95a.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 95GFP01 Area A (refer to Area A of the 95GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 95GFP01 in July of 1995. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/95b.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 95GFP01 Area B (refer to Area B of the 95GFP01 map) of Lake Borgne, Louisiana, during USGS Cruise 95GFP01 in July of 1995. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/96a.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 96GFP01 Area A (refer to Area A of the 96GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 96GFP01 in September of 1996. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/96b.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 96GFP01 Area B (refer to Area B of the 96GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 96GFP01 in September of 1996. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/96c.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 96GFP01 Area C (refer to Area C of the 96GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 96GFP01 in September of 1996. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/96d.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 96GFP01 Area D (refer to Area D of the 96GFP01 map) of Lake Borgne, Louisiana, during USGS Cruise 96GFP01 in September of 1996. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/96e.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 96GFP01 Area E (refer to Area E of the 96GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 96GFP01 in September of 1996. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/97a.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 97GFP01 Area A (refer to Area A of the 97GFP01 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 97GFP01 in August of 1997. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/97b.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 97GFP01 Area B (refer to Area B of the 97GFP01 map) of Lake Borgne, Louisiana, during USGS Cruise 97GFP01 in August of 1997. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/97c.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 97GFP01 Area C (refer to Area C of the 97GFP01 map) of Lake Borgne, Louisiana, during USGS Cruise 97GFP01 in August of 1997. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98a.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area A (refer to Area A of the 98GFP02 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98b.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area B (refer to Area B of the 98GFP02 map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:150,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The state layer is an ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/95a1.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 95GFP01 Area A1 (refer to Area A1 of the 95GFP01 Area A map) of Lake Pontchartrain, Louisiana, during USGS Cruise 95GFP01 in July of 1995. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/95b1.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 95GFP01 Area B1 (refer to Area B1 of the 95GFP01 Area B map) of Lake Borgne, Louisiana, during USGS Cruise 95GFP01 in July of 1995. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98a1.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area A1 (refer to Area A1 of the 98GFP02 Area A map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98a2.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area A2 (refer to Area A2 of the 98GFP02 Area A map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98a3.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area A3 (refer to Area A3 of the 98GFP02 Area A map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98b1.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area B1 (refer to Area B1 of the 98GFP02 Area B map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98b2.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area B2 (refer to Area B2 of the 98GFP02 Area B map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format.

Browse_Graphic_File_Type: JPEG

Browse_Graphic:

Browse_Graphic_File_Name: DVD/maps/98b3.jpg

Browse_Graphic_File_Description:

Trackline map of boomer seismic reflection data collected in 98GFP02 Area B3 (refer to Area B3 of the 98GFP02 Area B map) of Lake Pontchartrain, Louisiana, during USGS Cruise 98GFP02 in June of 1998. This map is set in geographic coordinates, NAD83 (unprojected) and was created at a scale of 1:22,000. It was created using ESRI GIS software ArcView 3.2 and 8.1, exported to Adobe Illustrator for further editing, and saved in JPEG format. The USGS is not the originator of all layers used in creating this map. The highways layer is a Bureau of Transportation Statistics/ESRI data set. The railroads layer is a National Wetlands Research Center (USGS Biological Resources Discipline) data set.

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, the University of New Orleans (UNO), the Lake Pontchartrain Basin Foundation, the National Oceanic and Atmospheric Administration, the Coalition to Restore Coastal Louisiana, the U.S. Army Corps of Engineers, the Environmental Protection Agency, and the University of Georgia. We thank Rita Byrd, formerly of the USGS in St. Petersburg, Florida, for her field support during boomer data collection. We also thank Bob Seal and Paul Connor of UNO for their work during the vibracoring and other portions of these cruises. We are also grateful to R/V G.K. Gilbert Captains Richard W. Young of the USGS in St. Petersburg, Florida; Kevin Geraghty, formerly of the USGS in St. Petersburg, Florida; and Dave Bennett of Eckerd College for their assistance in data collection. This document was improved by the reviews of Tonya D. Clayton and Asbury H. Sallenger of the USGS in St. Petersburg, Florida.

Native_Data_Set_Environment: SEG-Y

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. Recording times for 97GFP01 line pon97_16 and 98GFP02 line lasi_58 were not continuously updated. The original trace files for 94GFP01 lines PON531_2, PON61_1, PON62_1, PON62_3, LINE_7, LINE_10, LINE_14, LINE_17, LINE_18, and LINE_20; 96GFP01 lines pon96_6, pon96_9, and pon96_12; and 97GFP01 lines pon97_1, pon97_12, pon97_16, and pon97_17 were divided into two or more trace files (e.g., LINE_7 became LINE_7a and LINE_7b) because the original total number of traces exceeded the maximum allowed by the processing system.

Logical_Consistency_Report:

These data sets are from five 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. Refer to the Supplemental Information section for details of equipment and geometry used for each seismic line.

Completeness_Report:

These data are collected along tracklines (2D) and are therefore inherently incomplete. Geologic details between lines must be inferred. Record length for all tracklines is 100 ms. Digital data were not recorded for 94GFP01 lines PON531_1 and LINE_9A and 96GFP01 line pon96_8. No data were collected for 95GFP01 line SBP_A1 and 98GFP02 lines lasi_16 and lasi_48a - lasi_54. Navigation is intermittent for 94GFP01 lines PON531_2a, PON61_1a, PON62_3a, and LINE_14a; 95GFP01 line SBP_D; 96GFP01 lines pon96_1 and pon96_25; 97GFP01 lines pon97_8, pon97_12a, pon97_16a, pon97_17a; and 98GFP02 line lasi_58. In addition, navigation is missing at the start of many 94GFP01, 95GFP01, and 96GFP01 lines.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The positional accuracy was determined with a Trimble Nav Trac/Nav Beacon XL DGPS receiver for 94GFP01 and 95GFP01, a Rockwell PLGR GPS receiver for 96GFP01 and 97GFP01, and a Trimble Nav Graph GPS receiver for 98GFP02. The accuracy of all receivers used is within 15 m. The DGPS/GPS string was fed to the Delph Seismic acquisition system about every 60 s for 94GFP01, 95GFP01, and 96GFP01, and about every 2 s for 97GFP01 and 98GFP02. Navigation fixes were recorded in latitude and longitude in the SEG-Y headers. The sled was towed about 20 m behind the GPS antenna, and no correction for this offset has been made.

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: Raw SEG-Y data were processed with Seismic Unix to produce the GIF seismic profile images included in this report. A representative data 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.

Process_Date: 2003

Process_Step:

Process_Description:

Positional (navigation) data: As the seismic reflection data were acquired, the position of the vessel was continuously determined by a DGPS/GPS receiver. Positions were recorded about every 60 s (94GFP01, 95GFP01, 96GFP01) or every 2 s (97GFP01, 98GFP02) and written to the SEG-Y header. The ASCII navigation and 500-shot interval navigation files were extracted from the SEG-Y headers using Seismic Unix scripts.

Process_Date: 2003

Process_Step:

Process_Description:

Editing navigation: The ASCII navigation files were extracted from the SEG-Y headers and edited to remove spurious data points and fix incorrectly recorded dates. The data were then processed using PROJ.4 (http://www.remotesensing.org/proj) to convert latitude and longitude to Zone 15 UTMs and reformatted for use with ESRI ArcView GIS software. Both sets of coordinates are provided for all lines.

Process_Date: 2003

Process_Step:

Process_Description:

Open-File preparation: No processing has been done to the SEG-Y data files provided on these discs, with the exception of dividing 94GFP01 lines PON531_2, PON61_1, PON62_1, PON62_3, LINE_7, LINE_10, LINE_14, LINE_17, LINE_18, and LINE_20; 96GFP01 lines pon96_6, pon96_9, and pon96_12; and 97GFP01 lines pon97_1, pon97_12, pon97_16, and pon97_17 into two or more trace files (e.g., LINE_7 became LINE_7a and LINE_7b) because the original total number of traces exceeded the maximum allowed by the processing system. The data were displayed as 8-bit grayscale Postscript files using the Seismic Unix 'psimage' algorithm. The Postscript images were then converted to GIF images.

Process_Date: 2003

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

Horizontal X and Y locations (both Zone 15 UTMs and latitude and longitude) for each shot are provided in ASCII position files, along with the time the shot was recorded in Greenwich Mean Time.

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: Each profile is available as a binary file in Society of Exploration Geophysicists (SEG) SEG-Y format. A SEG-Y file consists of 1) a 3,200-byte file identification record of ASCII-formatted general information, 2) a 400-byte binary record with information such as sample rate and record length specific to the data set, and 3) multiple records, with one seismic reflection trace per record for boomer data. Each trace record is preceded by a 240-byte trace header containing information such as trace number and acquisition day and time specific to each trace. The trace data are represented as a time series of unitless 16-bit integer or 32-bit real numbers proportional to the reflection coefficient. The SEG-Y file is useful only if you have access to specialized software designed to process and display seismic reflection data. These SEG-Y files have a .TRA extension and range in size from 1.6 to 110.1 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:

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: Each profile is available as a GIF image. These profiles range in size from 134 KB to 5.1 MB. The trackline maps are JPEG images that contain hotlinks to the seismic profile GIF images.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Shawn V. Dadisman

Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing address

Address: 600 Fourth 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 Open-File Report 03-497

Distribution_Liability:

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code.

This Digital Versatile Disc (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, make 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 necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

Although all data published on these DVDs 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 this 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: 5,998 MB

Digital_Transfer_Option:

Offline_Option:

Offline_Media: DVD

Recording_Format: ISO 9660

Compatibility_Information: UNIX, LINUX, DOS, MAC

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI map documents, shapefiles, metadata

Format_Information_Content:

GIS project used to create the trackline maps presented in this archive and associated metadata

File_Decompression_Technique: unzip

Transfer_Size: 57.5 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: DVD/software/arc/arc.zip

Fees:

Available from the Denver Open-File Sales Department. Prices vary.

Ordering_Instructions:

Most open-file reports are available from USGS Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, email: infoservices@usgs.gov).

Technical_Prerequisites:

Use of SEG-Y data requires specialized seismic processing software, such as Unix or Linux-based public domain software Seismic Unix developed by the Colorado School of Mines Center for Wave Phenomena and downloadable at <http://www.cwp.mines.edu/cwpcodes/index.html>.

Metadata_Reference_Information:

Metadata_Date: 20040114

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Karynna Calderon

Contact_Organization: ETI Professionals, Inc.

Contact_Position: Geographer, Data Management Group

Contact_Address:

Address_Type: mailing address

Address: U.S. Geological Survey, 600 Fourth Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: (727) 803-8747, ext. 3143

Contact_Electronic_Mail_Address: kcalderon@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998