U.S. Geological Survey, 2007, BATHY - Bathymetry within the inner shelf of Long Bay, South Carolina collected by the USGS, 1999-2003 (Grid): Open-File Report 2005-1346, 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:
Baldwin, W.E., Denny, J.F., Schwab, W.C., Gayes, P.T., Morton, R.A., and Driscoll, N.W., 2007, Geologic Framework Studies of South Carolina's Long Bay from Little River Inlet to Winyah Bay, 1999-2003; geospatial data release: Open-File Report 2005-1346, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
This is a Raster data set. It contains the following raster data types:
Planar coordinates are encoded using row and column
Abscissae (x-coordinates) are specified to the nearest 100.000000
Ordinates (y-coordinates) are specified to the nearest 100.000000
Planar coordinates are specified in meters
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.
508-548-8700 x2311 (voice)
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This data set contains swath bathymetric data collected between 1999 and 2003. These data are used to define the sea-floor morphology offshore of the Grand Strand, South Carolina.
Person who carried out this activity:
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
These data are internally consistent and have been compared to multibeam and single-beam bathymetric surveys to check for accuracy. Any differences between this bathymetric data set and others were determined to be within acceptable error given the inherent differences in the various bathymetric data sets (i.e. acquisition system, mode of navigation, density of point, and or swath bathymetry).
DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. 99% of the positional data is DGPS. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). The configuration of the fathometer is as follows: The fathometer is mounted on either the port or starboard side of the vessel. Offset between the sidemount and GPS antennae is measured. No measurements were taken of ship's pitch, yaw, heave, or change in draft due to water and fuel usage. Motion of the fathometer is not measured. Horizontal accuracy of the fathometer is assumed to be within 3 meters.
Ship motion was recorded with a TSS DMS 2-05 Attitude Sensor, mounted directly above the SEA SwathPlus transducers. Navigation was recorded using a Differential Global Positioning System (DGPS). The interferometric sonar is an angle-measuring system; depth accuracy decreases with increasing horizontal range. The combined angular accuracy of the SwathPlus system and the TSS DMS 2-05 attitude sensor is documented as 0.1 degrees. Assuming a constant angular accuracy, and using the International Hydrographic Standard (IHO) of a required 0.3 meter accuracy in < 30 meter water depth, all data collected within the survey fall within the IHO accuracy standards. However, vertical accuracy is also directly affected by the accuracy of both the navigation system and tidal measurements.
Complete
These data were checked for consistency by plotting the point data with the contoured surface and eliminating spurious and anomalous soundings. All data were acquired with an SEA, ltd SwathPlus interferometric sonar (234 kHz).
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- These data are NOT to be used for navigation. 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.
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Downloadable Data
Although all data have been used by the 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: | Grid containing swath bathymetric data collected offshore of the Grand Strand, SC in format ESRI Grid (version ArcGIS 9.0) ESRI Grid File Size: 3.261 |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2005/1346/arcgis/bathy/bathy_grd.zip> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
|
These data are available in Environmental Systems Research Institute (ESRI) Raster GRID format. The user must have software capable of importing and processing the data file.
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
