Identification_Information:
  Citation:
    Citation_Information:
      Originator: Hart, Patrick E.
      Originator: Cooper, Alan K.
      Originator: Twichell, David
      Publication_Date: 2005
      Title: GOM98LINE.SHP - Tracklines of Multichannel Seismics Survey Collected During USGS Cruise M1-98-GM
      Edition: 1.0
      Geospatial_Data_Presentation_Form: vector digital data
      Series_Information:
        Series_Name: Open-File Report
        Issue_Identification: 2005-1071
      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/2005/1071/data/seismic/1998/nav/gom98line.zip
      Larger_Work_Citation:
        Citation_Information:
          Originator: Twichell, D.C.
          Originator: Cross, V.A.
          Originator: Paskevich, V.F.
          Originator: Hutchinson, D.R.
          Originator: Winters, W.J.
          Originator: Hart, P.E.
          Publication_Date: 2005
          Title: GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey
          Edition: 1.0
          Series_Information:
            Series_Name: Open-File Report
            Issue_Identification: 2005-1071
          Publication_Information:
            Publication_Place: Woods Hole Science Center, Woods Hole, MA
            Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
          Other_Citation_Details: 1 DVD-ROM
          Online_Linkage: http://pubs.usgs.gov/of/2005/1071
  Description:
    Abstract:
      Shapefile showing tracklines of Multichannel Seismics Survey Collected During USGS Cruise M1-98-GM.  This cruise was to the Mississippi Canyon region of the Gulf of Mexico, and data were collected along 555 km of tracklines.

      During June 1998 and April 1999, the U.S. Geological Survey (USGS) conducted two research cruises in the northern Gulf of Mexico to acquire high-resolution seismic reflection data across the upper and middle continental slope as part of an investigation of the seismic character, distribution, and potential effects of naturally-occurring marine gas hydrates and related free gas within the gas hydrate stability zone. Over 1600 km of two-dimensional multichannel seismic reflection profiles were acquired during these two cruises. The specific objectives of this investigation are (a) to produce high-resolution images of the gas hydrate stability zone; (b) to study the distribution and character of potential seafloor failures and their relationship to known and inferred gas hydrate deposits; (c) to look at systematic variations in subsurface structure in gas hydrate and non-hydrate areas; and (d) to estimate, if possible, the amounts of hydrates present within the gas hydrate stability zone. The multichannel profiles provide high-quality images with approximately 5 meters of vertical resolution and up to 2 km of penetration. This report gives an overview of the acquisition and data processing of the multichannel seismic reflection profiles and provides references and links to reports with more detailed information. Geologic interpretations of these seismic profiles regarding gas hydrate occurrence and distribution within the study areas of this investigation are given in Hart and others (2002).
    Purpose: This GIS overlay is a component of the U.S. Geological Survey, Woods Hole Field Center's, Gulf of Mexico GIS database.  The Gulf of Mexico GIS database is intended to organize and display USGS held data and provide on-line (WWW) access to the data and/or metadata.
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 19980601
        Ending_Date: 19980630
    Currentness_Reference: ground condition
  Status:
    Progress: In work
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -89.941090
      East_Bounding_Coordinate: -88.997710
      North_Bounding_Coordinate: 28.657360
      South_Bounding_Coordinate: 28.026890
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: General
      Theme_Keyword: multichannel
      Theme_Keyword: hydrophone
      Theme_Keyword: polyline shapefile
      Theme_Keyword: navigation
      Theme_Keyword: U.S. Geological Survey
      Theme_Keyword: USGS
      Theme_Keyword: Coastal and Marine Geology Program
      Theme_Keyword: CMGP
      Theme_Keyword: Woods Hole Science Center
      Theme_Keyword: WHSC
      Theme_Keyword: Information Archives Field Activity M1-98-GM
      Theme_Keyword: R/V TOMMY MUNRO
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Category
      Theme_Keyword: oceans and estuaries
      Theme_Keyword: location
      Theme_Keyword: geoscientificInformation
    Place:
      Place_Keyword_Thesaurus: General
      Place_Keyword: Gulf of Mexico
      Place_Keyword: Continental Slope
  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 (USGS) as the source of this information.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Hart, Patrick
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Geophysicist
      Contact_Address:
        Address_Type: mailing address
        Address: 345 Middlefield Road, MS 999
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025
        Country: USA
      Contact_Voice_Telephone: 650-329-5160
      Contact_Facsimile_Telephone: 650-329-5190
      Contact_Electronic_Mail_Address: hart@usgs.gov
  Browse_Graphic:
    Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98_line-thumb.gif
    Browse_Graphic_File_Description: Thumbnail image showing the extent and coverage of the data layer.
    Browse_Graphic_File_Type: GIF
  Browse_Graphic:
    Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98_line.gif
    Browse_Graphic_File_Description: Image showing the extent and coverage of the data layer.
    Browse_Graphic_File_Type: GIF
  Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
  Cross_Reference:
    Citation_Information:
      Originator: Hart, P.E.
      Originator: Cooper, A.K.
      Originator: Twichell, D.C.
      Originator: Lee, M.
      Originator: Agena, W.
      Publication_Date: 2002
      Title: High-resolution multichannel seismic-reflection data acquired in the northern Gulf of Mexico, 1998-99
      Edition: 1.0
      Series_Information:
        Series_Name: Open-File Report
        Issue_Identification: 02-368
      Publication_Information:
        Publication_Place: Western Coastal and Marine Geology, Menlo Park, CA
        Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
      Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of02-368/
  Cross_Reference:
    Citation_Information:
      Originator: Alan Cooper
      Originator: Patrick Hart
      Originator: Ingo Pecher
      Publication_Date: 1998
      Title: Cruise Report for a Seismic Investigation of Gas Hydrates in the Mississippi Canyon Region, Northern Gulf of Mexico - Cruise M1-98-GM
      Series_Information:
        Series_Name: Open-File Report
        Issue_Identification: 98-506
      Publication_Information:
        Publication_Place: Western Coastal and Marine Geology, Menlo Park, CA
        Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
      Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of98-506/
Data_Quality_Information:
  Logical_Consistency_Report: No additional checks for topological consistency were performed on this data set.  No duplicate features are present.
  Lineage:
    Process_Step:
      Process_Description: The navigation text file gm98nav.txt was imported form USGS Open-File Report 02-368.  This ASCII file was imported to Microsoft Excel and then exported as a comma delimited text file.  ArcView 3.3 was uses to add the comma delimited text to the project as a table, and the table then was saved as a shapefile.
      Source_Used_Citation_Abbreviation: http://geopubs.wr.usgs.gov/open-file/of02-368/gm98nav.txt
      Source_Produced_Citation_Abbreviation: gom98shtallg.shp
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Person: VeeAnn Cross
            Contact_Organization: U.S. Geological Survey
          Contact_Position: Marine 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 x2251
          Contact_Facsimile_Telephone: (508) 457-2310
          Contact_Electronic_Mail_Address: vatnipp@usgs.gov
    Process_Step:
      Process_Description: The point shapefile (gom99shtallg.shp) was converted to a line file using an Avenue script "navpnts2line.ave" written by VeeAnn Cross.
      Source_Used_Citation_Abbreviation: gom99shtallg.shp
      Source_Produced_Citation_Abbreviation: gom99lmcs.shp
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Person: VeeAnn Cross
            Contact_Organization: U.S. Geological Survey
          Contact_Position: Marine 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 x2251
          Contact_Facsimile_Telephone: (508) 457-2310
          Contact_Electronic_Mail_Address: vatnipp@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: 41
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: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 80
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: gom98line
      Entity_Type_Definition: Shapefile Attribute Table
      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: ID
      Attribute_Definition: sequential numbers
      Attribute_Definition_Source: user defined
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 1
          Range_Domain_Maximum: 41
          Attribute_Units_of_Measure: integer
          Attribute_Measurement_Resolution: 1
    Attribute:
      Attribute_Label: LINENUM
      Attribute_Definition: Number associated with each seismic survey line
      Attribute_Definition_Source: USGS
      Attribute_Domain_Values:
        Unrepresentable_Domain: Character string representing the survey line
    Attribute:
      Attribute_Label: IMAGE
      Attribute_Definition: Path to and name of image of seismic profile associated with each survey line.
      Attribute_Definition_Source: USGS
      Attribute_Domain_Values:
        Unrepresentable_Domain: Character stringin containing the relative path and name of image of seismic profile that is linked to this track line.
    Attribute:
      Attribute_Label: LENGTH
      Attribute_Definition: length of trackline in meters
      Attribute_Definition_Source: Software Computed
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 3282.795
          Range_Domain_Maximum: 55944.282
          Attribute_Units_of_Measure: meters
          Attribute_Measurement_Resolution: .001
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: David 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
        Country: USA
      Contact_Voice_Telephone: (508) 548-8700 x2266
      Contact_Facsimile_Telephone: (508) 457-2310
      Contact_Electronic_Mail_Address: dtwichell@usgs.gov
  Resource_Description: Downloadable Data
  Distribution_Liability: Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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: SHP
        Format_Version_Number: 3.3
        Format_Specification: ESRI Shapefile Format
        Format_Information_Content: The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBase format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml.  An ASCII version of the metadata file.  A browse graphic showing the data layer coverage and extent (optional).
        File_Decompression_Technique: Zip
        Transfer_Size: 0.060
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://pubs.usgs.gov/of/2005/1071/data/seismic/1998/nav/gom98line.zip
          Access_Instructions: Data may be retrieved via any WWW browser.
        Offline_Option:
          Offline_Media: DVD-ROM
          Recording_Capacity:
            Recording_Density: 4.75
            Recording_Density_Units: Gbytes
          Recording_Format: UDF
    Fees: None
  Technical_Prerequisites: These data are available in Environmental Systems Research Institute (ESRI) 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 the importing data.  A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.
Metadata_Reference_Information:
  Metadata_Date: 2005
  Metadata_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 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
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: universal 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