U.S. Geological Survey, 2007, GRAINSIZE_POLY - Grain Size Distribution of Surficial Sediments offshore of the Grand Strand, South Carolina region (Polygon): Open-File Report 2005-1346, U.S. Geological Survey, Coastal and Marine Geology, 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., 2006, 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 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 0.000008. Longitudes are given to the nearest 0.000008. 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: | 1 |
| Maximum: | 3 |
| Units: | integer count |
| Resolution: | 1 |
| Value | Definition |
|---|---|
| Coarse Sand | Sediment of 0-1 phi |
| Fine Sand | Sediment of 2-3 phi |
| Medium Sand | Sediment of 1-2 phi |
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
This data set contains polygon shapefile outlining grain size distribution throughout the 1999 - 2003 survey area, offshore of the Grand Strand, SC.
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
Data sources produced in this process:
Interpretations of grain size distribution are based on sample textural information, sidescan-sonar imagery, swath bathymetry and seismic data. The mean grain size of surficial sediment samples were used to generate the grain size polygons. These data were manually interpreted and digitized at a scale of 1:75,000 (regional interpretation).
DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). Accuracy of sample locations is assumed to be comparable to DGPS accuracy (+ 2 m). Sediment statistics at each sample location were used to generate the grain size polygons.
These data include all grain size information. Grain size distribution is represented as polygons. All data were included in the analysis.
Additional checks for topologic consistency were conducted to ensure polygon boundaries close, and neighboring polygons share borders.
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 (voice)
508-457-2310 (FAX)
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: | Shapefile contains polygons defining grain size distribution on the inner shelf offshore of the Grand Strand, SC in format SHP (version ArcGIS 9.0) ESRI Polygon Shapefile Size: 0.129 |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2005/1346/arcgis/samples/GrainSize_Poly.zip> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
|
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 importing data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
