| Santee River, SC (S070) Bathymetric Digital Elevation Model (30 meter resolution)
Derived From Source Hydrographic Survey Soundings Collected by NOAA |
| Bathymetry for the Santee River was derived from two surveys containing 11,079 soundings.
No surveys were omitted. The average separation between soundings was 40 meters. Both
surveys dated from 1934. The total range of sounding data was 0.3 meters to -10.4
meters at mean low water. Mean high water values between 1.2 and 1.4 meters were assigned
to the shoreline. One point was found that was not consistent with the surrounding
data, and was removed prior to tinning. DEM grid values outside the shoreline (on
land) were assigned null values (-32676). The Santee River has four 7.5 minute DEMs
and a single one degree DEM. The 1 degree DEMs were generated from the higher resolution
7.5 minute DEMs which covered the estuary. A Digital Elevation Model (DEM) contains
a series of elevations ordered from south to north with the order of the columns from
west to east. The DEM is formatted as one ASCII header record (A- record), followed
by a series of profile records (B- records) each of which include a short B-record
header followed by a series of ASCII integer elevations (typically in units of 1 centimeter)
per each profile. The last physical record of the DEM is an accuracy record (C-record).
The 7.5-minute DEM (30- by 30-m data spacing) is cast on the Universal Transverse
Mercator (UTM) projection. It provides coverage in 7.5- by 7.5-minute blocks. Each
product provides the same coverage as a standard USGS 7.5-minute quadrangle but the
DEM contains over edge data. Coverage is available for many estuaries of the contiguous
United States but is not complete. |
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