Bronze level automatically awarded US beta

This data has achieved Bronze level on 25 October 2015 which means this data makes a great start at the basics of publishing open data.

St. Helena Sound, SC (S100) Bathymetric Digital ElevationModel (30 meter resolution) Derived From Source Hydrographic SurveySoundings Collected by NOAA

Description

Bathymetry for St. Helena Sound was derived from nineteen surveys containing83,246 soundings. No surveys were omitted. The average separationbetween soundings was 49 meters. Sixteen of the nineteen surveys useddated from 1934. The remaining surveys, located in the southwest, dated from1956 and 1973. The total range of sounding data was 3.7 meters to -23.5meters at mean low water. Mean high water values between 1.5 and 2.1meters were assigned to the shoreline. Six points were found that were notconsistent with the surrounding data. These were removed prior to tinning.DEM grid values outside the shoreline (on land) were assigned nullvalues (-32676).St. Helena Sound has eleven 7.5 minute DEMs and a single one degreeDEM. The 1 degree DEMs were generated from the higher resolution 7.5minute DEMs which covered the estuary. A Digital Elevation Model(DEM) contains a series of elevations ordered from south to northwith the order of the columns from west to east. The DEM isformatted as one ASCII header record (A- record), followed by aseries of profile records (B- records) each of which include a shortB-record header followed by a series of ASCII integer elevations(typically in units of 1 centimeter) per each profile. The lastphysical record of the DEM 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.

General Information

Legal Information

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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    yes, and the rights are all held by the same person or organisation Do you think this data is incorrect? Let us know

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  • This data contains

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Practical Information

  • The data appears in this collection

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Technical Information

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  • Find out how to contact someone about this data at

    http://catalog.data.gov/dataset/st-helena-sound-sc-s100-bathymetric-digital-elevationmodel-30-meter-resolution-derived-from-sou Do you think this data is incorrect? Let us know

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    http://www.data.gov/issue/?media_url=http://catalog.data.gov/dataset/st-helena-sound-sc-s100-bathymetric-digital-elevationmodel-30-meter-resolution-derived-from-sou Do you think this data is incorrect? Let us know