Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2009 Title: MOSAIC5 - Composite sidescan-sonar mosaic collected by the U.S. Geological Survey offshore of the Chandeleur Islands, LA, 2007 (UTM Zone 16N GeoTIFF) Edition: 1.0 Geospatial_Data_Presentation_Form: remote-sensing image 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/Sidescan/mosaic5.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 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 GeoTIFF (Tagged Image File Format) contains approximately 42 square-km of sidescan sonar data that were collected in 2007. These data are used to define the sea-floor morphology offshore of the Chandeleur Islands in Eastern Louisiana. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070612; 20070619 Ending_Date: 20070615; 20070621 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89.294423 East_Bounding_Coordinate: -89.158560 North_Bounding_Coordinate: 29.467274 South_Bounding_Coordinate: 29.375751 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: sidescan-sonar Theme_Keyword: sidescan Theme_Keyword: side scan sonar Theme_Keyword: backscatter Theme_Keyword: GeoTIFF image Theme_Keyword: grey scale Theme_Keyword: composite image Theme_Keyword: WHSC field activity report number 07007 Theme_Keyword: mosaic Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: oceans and coastal Theme_Keyword: oceans and estuaries Theme_Keyword: geoscientificInformation Theme_Keyword: imageryBaseMapsEarthCover Place: Place_Keyword_Thesaurus: General Place_Keyword: Louisiana Place_Keyword: Chandeleur Islands 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: North-Central Gulf Coast Place_Keyword: United States Place_Keyword: Gulf of Mexico 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: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2266 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/mosaic5.jpg Browse_Graphic_File_Description: grey scale image of sidescan-sonar mosaic 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: W.W. Danforth Originator: T.F. O'Brien Originator: W.C. Schwab Publication_Date: 1991 Title: USGS image processing system: near real-time mosaicking of high-resolution sidescan-sonar data Series_Information: Issue_Identification: Jan. 1991 Publication_Information: Publisher: Sea Technology Cross_Reference: Citation_Information: Originator: William W. Danforth Publication_Date: 1997 Title: XSonar/ShowImage: A complete system for rapid sidescan-sonar processing and display. Series_Information: Series_Name: Open-File Report Issue_Identification: 97-686 Publication_Information: Publisher: U.S. Geological Survey Cross_Reference: Citation_Information: Originator: A. Malinverno Originator: M. Edwards Originator: W.B.F. Ryan Publication_Date: 1990 Title: Processing of SeaMARC swath sonar data. Series_Information: Issue_Identification: 15 Publication_Information: Publisher: Journal of Oceanic Engineering Cross_Reference: Citation_Information: Originator: V.F. Paskevich Publication_Date: 1996 Title: MAPIT: An improved method for mapping digital sidescan sonar data using the Woods Hole Image Processing System (WHIPS) Software Series_Information: Series_Name: Open-File Report Issue_Identification: 96-281 Publication_Information: Publisher: U.S. Geological Survey Data_Quality_Information: Attribute_Accuracy: Completeness_Report: All available data were used to create the backscatter mosaic. Some lines with excess noise were clipped after the mosaic was completed. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: These data were navigated with a Differential Global Positioning System (DGPS) mounted above the interferometric sonar head. Unless noted, all DGPS data are referenced to WGS84. The layback distance between towed sidescan sonar fish and the mounted GPS antennae were measured on the ship and corrected for these navigation data. Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: < 10 meters Horizontal_Positional_Accuracy_Explanation: The differential GPS is accurate within 1 to 2 meters. 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 Vertical_Positional_Accuracy: Quantitative_Vertical_Positional_Accuracy_Assessment: 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: 20070612; 20070619 Ending_Date: 20070615; 20070621 Source_Currentness_Reference: ground condition Source_Contribution: Data acquisition at sea: These sidescan-sonar data were collected with a Klein 3000 dual frequency sidescan sonar towed 3 meters astern of the R/V Acadiana. These data were acquired using SonarPro Software (version: none) during a cruise in June 2007. Data were collected along tracklines spaced 100 to 125 m apart at a speed of 1.5 to 2.5 m/s. The dual frequencies of the sonar system are 100 and 500 kHz . Navigation was by means of differential GPS. All sidescan-sonar data were logged digitally at a sample rate resulting in a 0.18-m pixel size in the across-track direction and approximately 0.14-m in the along-track direction following the methodology outlined in Danforth and others (1991) and Danforth (1997). Process_Step: Process_Description: Within XSonar Software (version: none) a median filtering routine (Malinverno and others, 1990) was applied to the raw sidescan-sonar data (.xtf) to remove speckle noise; the filter was 6 pixels across track by 3 pixels along track. The data were further processed to correct for fish altitude, slant and beam artifacts, and then merged with the navigation (Danforth, 1997). These 2007 data were affected by port noise on the following days 20070610-20070619. XSonar was edited to reduce the port highpass value (from 4095 to 2500), in an effort to improve the sonar image. Odd and even sidescan sonar lines were mapped seperately out of XSonar at 1 meter/pixel resolution. Sidescan areas were defined within the cruise domain such that the sonar images mapped in XSonar would be no larger than 200 Mb. Process_Date: 2007 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton 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) 548-8700x2259 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Process_Step: Process_Description: The odd and even area files were imported into PCI Geomatica Software (version 10.1) to be digitally mosaicked together using PCI's OrthoEngine and procedures described in Paskevich (1996). The mosaicking process produces an enhanced, geographically correct, sidescan-sonar mosaic with 1 meter/pixel resolution. The composite mosaic was exported as a GeoTIFF image. Source_Used_Citation_Abbreviation: MOSAIC9.pix Process_Date: 2007 Source_Produced_Citation_Abbreviation: MOSAIC9.tif Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton 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) 548-8700x2259 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Process_Step: Process_Description: The days that experienced portside noise problems (20070610-20070619) needed further processing to improve the mosaic image. Portside swaths that displayed as 'whiteout' within the mosaicked image had pixel values greater than 200 (out of 256) due to noise, and were deleted using the lasso tool in Adobe Photoshop CS2 (version 9.0.2). Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologsit Contact_Voice_Telephone: (508) 548-8700x2259 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Time_of_Day: 17162400 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: H:\n_GoM\dds_html\GIS_catalog\Sidescan\mosaic8.tif.xml Time_of_Day: 17221600 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: H:\n_GoM\dds_html\GIS_catalog\Sidescan\mosaic7.tif.xml Time_of_Day: 17252700 Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: H:\n_GoM\dds_html\GIS_catalog\Sidescan\mosaic6.tif.xml Time_of_Day: 17283700 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 9900 Column_Count: 13000 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -87.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 1.000000 Ordinate_Resolution: 1.000000 Planar_Distance_Units: meters 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: Overview_Description: Entity_and_Attribute_Overview: There are no attributes associated with a GeoTIFF image. Image pixel values contain acoustic reflectivity values normalized to an 8-bit data range (0-255). Low-backscatter is represented by dark tones (low values) and high-backscatter is represented by bright tones (high values). The background color is set to 255 and can be turned off without removing data values. Entity_and_Attribute_Detail_Citation: 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 U.S. Geological Survey 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 geographic GeoTIFF image of side-scan sonar data collected offshore of the Chandeleur Islands, LA, and associated metadata. File_Decompression_Technique: use WinZip or pkUnzip Transfer_Size: 10.000 Mbytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2008/1195/GIS_catalog/Sidescan/mosaic5.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 a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image. Metadata_Reference_Information: Metadata_Date: 20090128 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton 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) 548-8700x2259 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: ependleton@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 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile