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This GIS data layer shows the tracklines along which SIS-1000 chirp subbottom profile data and sidescan sonar data were collected in the Gulf of Mexico during a cruise aboard the R/V GYRE (USGS cruise 99002) to study the shallow subsurface geology of an area of possible gas hydrate occurrence. The navigation has been corrected to show the SIS-1000 vehicle location rather than the ship location (Foster and others, 2000). This survey was on the upper continental slope offshore of Louisiana, and chirp profiles were collected along 339 km of tracklines.
Are there legal restrictions on access or use of the data?
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.
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.
|Data format:||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). in format SHP (version 3.3) ESRI polyline shapefile Size: 0.047|
|Media you can order:||DVD-ROM (Density 4.75 Gbytes) (format UDF)|
The 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 importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.