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 .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