Twichell, David, 2005, SEAMARC_COVERAGE.SHP - outline of the extent of SeaMARC 1A sidescan sonar data coverage for the Mississippi Fan, USGS Gulf of Mexico Cruise 90001: Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.This is part of the following larger work.Online Links:
D.C., Twichell, V.A., Cross, Paskevich, V.F., Hutchinson, D.R., Winters, W.J., and Hart, P.E., 2005, GIS of selected geophysical and core data in the northern Gulf of Mexico continental slope collected by the U.S. Geological Survey: Open-File Report 2005-1071, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 0 |
| Units: | integer count |
| Resolution: | 1 |
| Range of values | |
|---|---|
| Minimum: | 3047305677.490 |
| Maximum: | 3047305677.490 |
| Units: | square meters |
| Resolution: | .001 |
| Range of values | |
|---|---|
| Minimum: | 489205.081 |
| Maximum: | 489205.081 |
| Units: | meters |
| Resolution: | .001 |
(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov
This GIS data layer outlines the extent of the sidescan sonar image that was collected by the SeaMARC 1A system in 1990 in the eastern Gulf of Mexico on the Mississippi Fan.
Twichell, David, 2001, enhanced 25 m SeaMARC 1A sidescan sonar mosaic: Open-File Report 00-352, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.This is part of the following larger work.Online Links:
Paskevich, V., Twichell, D., and Schwab, W., 2001, SeaMARC1A sidescan mosaic, cores and depositional interpretation of the Mississippi Fan: ArcView GIS Data Release: Open-File Report 00-352, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Person who carried out this activity:
(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov
Data sources produced in this process:
Person who carried out this activity:
(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov
Data sources produced in this process:
Paskevich, V., Twichell, D., and Schwab, W., 2001, SeaMARC1A sidescan mosaic, cores and depositional interpretation of the Mississippi Fan: ArcView GIS Data Release: Open-File Report 00-352, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
No additional checks for topological consistency were performed on this data set.
Are there legal restrictions on access or use of the data?
- 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.
(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov
Downloadable data.
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 polygon shapefile Size: 0.004 |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2005/1071/data/sidescan/interpretation/seamarc/seamarc_coverage.zip> |
| 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.
(508) 548-8700 x2266 (voice)
(508) 457-2310 (FAX)
dtwichell@usgs.gov
