Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2009 Title: seismic_trk_07007.shp - Tracklines of chirp seismic-reflection data collected by the U.S. Geological Survey offshore of the Chandeleur Islands, LA, 2007 (polylines) Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2008-1195 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2008/1195/GIS_catalog/Tracklines/seismic_trk_07007.zip Larger_Work_Citation: Citation_Information: Originator: Wayne E. Baldwin Originator: Elizabeth A. Pendleton Originator: David C. Twichell Publication_Date: 2009 Title: Geophysical Data from offshore of the Chandeleur Islands, Eastern Mississippi Delta Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2008-1195 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2008/1195/ Description: Abstract: In 2006 and 2007, the U.S. Geological Survey, in partnership with Louisiana Department of Natural Resources and the University of New Orleans, conducted geologic mapping to characterize the sea floor and shallow subsurface stratigraphy offshore of the Chandeleur Islands in Eastern Louisiana. The mapping was carried out during two cruises on the R/V Acadiana. Data were acquired with the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, and an Edgetech 512i chirp subbottom profiling system. The long-term goal of this mapping effort is to produce high-quality geologic maps and geophysical interpretations that can be utilized to investigate the impact of Hurricane Katrina in 2005 and to identify sand resources within the region. Purpose: This data set contains trackline navigation for approximately 1655 km of EdgeTech 512i chirp seismic-reflection data collected by the U.S. Geological Survey during a 2007 geophysical cruise offshore of the Chandeleur Islands, LA. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070610 Ending_Date: 20070622 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89.293553 East_Bounding_Coordinate: -88.883122 North_Bounding_Coordinate: 29.661442 South_Bounding_Coordinate: 29.381022 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Science Center Theme_Keyword: WHSC Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: navigation Theme_Keyword: tracks Theme_Keyword: tracklines Theme_Keyword: Marine Geology Theme_Keyword: seismic profile Theme_Keyword: seismic reflection Theme_Keyword: seismic stratigraphy Theme_Keyword: chirp Theme_Keyword: EdgeTech Theme_Keyword: 512i Theme_Keyword: ESRI polyline shapefile Theme_Keyword: WHSC field activity serial number 07007 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: oceans and coastal Theme_Keyword: oceans and estuaries Theme_Keyword: location Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: General Place_Keyword: Louisiana Place_Keyword: Chandeleur Islands Place_Keyword: North Central Gulf Coast Place_Keyword: United States Place_Keyword: Gulf of Mexico Place_Keyword: Breton Island Place_Keyword: Gosier Island Place_Keyword: Curlew Island Place_Keyword: MRGO Place_Keyword: New Harbor Islands Place_Keyword: North Islands Place_Keyword: Mississippi River Gulf Outlet Access_Constraints: None Use_Constraints: Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David C. Twichell Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2266 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dtwichell@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2008/1195/images/chirp_trk.jpg Browse_Graphic_File_Description: EdgeTech 512i trackline navigation offshore of the Chandeleur Isands, LA Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Windows XP Professional x64 Edition Version 2003 Service Pack 2; ESRI ArcCatalog 9.2.4.1420 Cross_Reference: Citation_Information: Originator: John Stockwell Publication_Date: 2008 Title: CWP/SU: Seismic Uni*x Geospatial_Data_Presentation_Form: document Publication_Information: Publication_Place: Golden, CO Publisher: Center for Wave Phenomena - Colorado School of Mines Online_Linkage: http://www.cwp.mines.edu/cwpcodes/index.html Cross_Reference: Citation_Information: Originator: Paul Henkart Publication_Date: 2007 Title: SIOSEIS Geospatial_Data_Presentation_Form: document Publication_Information: Publication_Place: LaJolla, CA Publisher: Scripps Institution of Oceanography, University of California - San Diego Online_Linkage: http://sioseis.ucsd.edu/index.html Cross_Reference: Citation_Information: Originator: Michael W. Norris and Alan K. Faichney Publication_Date: 2002 Title: SEGY Rev.1 Data Exchange Format1 Geospatial_Data_Presentation_Form: document Publication_Information: Publication_Place: Tulsa, OK Publisher: Society of Exploration Geophysicists Online_Linkage: http://www.seg.org/SEGportalWEBproject/prod/SEG-Publications/Pub-Technical-Standards/Documents/seg_y_rev1.pdf Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: All attributes were checked in a consistent manner. Logical_Consistency_Report: Any spurious data points were removed during processing. Completeness_Report: All navigation from seismic reflection data collected during cruise ACAD07007 was used to generate this shapefile. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The SB-0512i was towed approximately 6 m astern and approximately 1.5 m below the sea surface. DGPS navigation (assumed to be accurate within 1-2 m) was obtained from the receiver mounted above the interferometric sonar head, but towfish layback was not accounted for. The layback of the towfish adds additional uncertainty due to changes in angle and scope of the tow cable in response to sea state and vessel speed. The use of J-Star acquisition software during the ACAD07007 cruise caused a reduction in the resolution of navigation values recorded to the trace headers from the onboard DGPS. During acquisition, J-Star truncates the three least significant digits from the raw navigation string, which reduces the resolution of each navigation fix on the order of 1-2 meters. Due to this acquisition flaw, the ship-track polylines in this shapefile display a "sawtooth" pattern when viewed at scales finer than approximately 1:3000. Based on horizontal offsets between the fish and GPS receiver, fish motion behind the vessel, and error associated with the acquisition system, the resulting positional accuracy is assumed to be +/- 20 m. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070610 Ending_Date: 20070622 Source_Contribution: Trackline acquisition at sea (2007): Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-0512i towfish (0.5-12 kHz) on the R/V Acadiana of Loreauville, LA. EdgeTech J-Star acquisition software was used to control the Geo-Star topside unit and digitally log trace data in the EdgeTech JSF format. Data were acquired using a 0.25-s fire rate, a 5-ms pulse length, and a 0.5 to 8 kHz sweep (swept frequency). Tracklines are spaced 100 to 125 m apart in the shore parallel direction and about 1 km apart in the shore perpendicular direction. Process_Step: Process_Description: jsftosegy (no version), a C script developed by Tom O'Brien (USGS - Woods Hole Seafloor Mapping Group) was used to convert raw chirp traces in the JSF format to chirp-processed, envelope traces in the SEG-Y rev. 1 standard format. Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: A script was run that used Seismic Unix (version 4.1) to read the SEG-Y files, write a Seismic Unix file, and extract SEG-Y trace header information, which included shot number, longitude, latitude, year, day, and time of day. Geographic coordinates were converted to UTM zone 16 coordinates using PROJ (version 4.6.0). Before saving the header information to a text file, the data were filtered using AWK to save only unique shot point locations. In addition, a separate text file containing even 500 shot intervals was saved. The 500 shot text file maintains the start and end shots, which may not necessarily by unique fixes. A 500 shot interval was chosen because it corresponds to the annotaion interval provided along the top of the seismic-reflection profile JPEG images, which are included in the "Seisimage" folder of the "GIS_Catalog". Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: Text files for each seismic line were concatenated into two comma-delimited text files, one containing unique shot point positions ('seismic_shtunique_07007.csv', which is provided in the zip-compressed package of the shapefile 'seismic_sht_07007.shp') , and another containing the 500 shot intervals. Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: Both concatenated, comma-delimited text files were imported into ArcMap (version 9.2) and saved as points in the ESRI shapefile format. Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Process_Step: Process_Description: The point shapefile containing unique shot point positions was used as an input for a VACExtras (version 1.9.4), a VB collection of tools developed by VeeAnn Cross (USGS-WHSC), which converts point data to a new polyline shapefile, based on the order of records contained within one attribute field. The shot number field was used to define the point order. The length of each line segment was calculated and inluded in a new attribute field using Xtools Pro for ArcGIS desktop (version 4.1.0), specifying UTM Zone 16 N - kilometers. Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 279 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000000 Longitude_Resolution: 0.000000 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: seismic_trk_07007 Entity_Type_Definition: ESRI polyline shapefile Entity_Type_Definition_Source: ESRI 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: FileName Attribute_Definition: Name of the seismic line file Attribute_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: ImageName Attribute_Definition: Name of the seismic profile image (includes location on DVD for hyperlinking) Attribute_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: LineNum Attribute_Definition: Number of planned seismic line Attribute_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: JD Attribute_Definition: Julian Day data were collected Attribute_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Year Attribute_Definition: Calendar Year of data collection Attribute_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: CruiseID Attribute_Definition: Unique USGS field activity code Attribute_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Length Attribute_Definition: Length of the seismic profile in kilometers (UTM Zone 16 N) Attribute_Definition_Source: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: WinZip Format_Version_Number: 9.0 Format_Information_Content: This WinZip file contains a shapefile of 512i seismic-reflection profile trackline navigation collected during cruise ACAD07007 offshore of the Chandeleur Islands, LA, and the associated metadata. File_Decompression_Technique: Use WinZip or pkUnzip Transfer_Size: 1.036 Mbytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2008/1195/GIS_catalog/Tracklines/seismic_trk_07007.zip Access_Instructions: Data can be downloaded via the World Wide Web (WWW) Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: Gbytes Recording_Format: UDF Fees: None Technical_Prerequisites: This zip file contains data available in Environmental Systems Research Institute (ESRI) point shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com. Metadata_Reference_Information: Metadata_Date: 20090128 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Wayne E. Baldwin Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700x2226 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: wbaldwin@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: None Metadata_Use_Constraints: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile