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Winyah Bay, SC (S060) Bathymetric Digital Elevation Model (30meter resolution) Derived From Source Hydrographic Survey SoundingsCollected by NOAA

Summary

Type of release
ongoing release of a series of related datasets

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
26 September 2015
Modified Date
26 September 2015
Update Frequency
irregular
Publishers
National Oceanic and Atmospheric Administration, Department of Commerce
Identifier
winyah-bay-sc-s060-bathymetric-digital-elevation-model-30meter-resolution-derived-from-source-h
Landing Page
http://catalog.data.gov/dataset/winyah-bay-sc-s060-bathymetric-digital-elevation-model-30meter-resolution-derived-from-source-h
Temporal Coverage
1 January 1935 — 1 January 1964

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Description

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.

Informazioni generali

Informazioni legali

This dataset has been created by US Government which means it is required to be in the public domain. However US copyright law only allows open access by US citizens, we have assumed the data is equivalently licensed as CC0 for the rest of the world as this is in the spirit of the US Government’s Open Data policy.

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