Bronze level automatically awarded US beta
This data has achieved Bronze level on 24 October 2015 which means this data makes a great start at the basics of publishing open data.
Bathymetry for Winyah Bay was derived from eight surveys containing 33,974soundings. No surveys were omitted. The average separation betweensoundings was 49 meters. Seven of the eight surveys dated from 1935. Theremaining survey, located in the south, dated from 1964. The total range ofsounding data was 1.5 meters to -15.5 meters at mean low water. Mean highwater values between 0.8 and 1.2 meters were assigned to the shoreline.Four points were found that were not consistent with the surrounding data.These were removed prior to tinning. DEM grid values outside theshoreline (on land) were assigned null values (-32676).Winyah Bay has seven 7.5 minute DEMs and a single one degree DEM. The1 degree DEMs were generated from the higher resolution 7.5 minuteDEMs which covered the estuary. A Digital Elevation Model (DEM)contains a series of elevations ordered from south to north with theorder of the columns from west to east. The DEM is formatted as oneASCII header record (A- record), followed by a series of profilerecords (B- records) each of which include a short B-record headerfollowed by a series of ASCII integer elevations (typically in unitsof 1 centimeter) per each profile. The last physical record of theDEM is an accuracy record (C-record).The 7.5-minute DEM (30- by 30-m data spacing) is cast on theUniversal Transverse Mercator (UTM) projection. It provides coveragein 7.5- by 7.5-minute blocks. Each product provides the samecoverage as a standard USGS 7.5-minute quadrangle but the DEMcontains over edge data. Coverage is available for many estuaries ofthe contiguous United States but is not complete.
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