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TOPOGRID DERIVED 10 METER RESOLUTION DIGITAL ELEVATION MODEL OF CHARLESTON, AND PARTS OF BERKELEY, COLLETON, DORCHESTER AND GEORGETOWN COUNTIES, SOUTH CAROLINA

U.S. Geological Survey Open File Report 2005-1372

By Peter G. Chirico

2005

EXPLANATION

The purpose of developing a new 10m resolution digital elevation model (DEM) of the Charleston Region was to more accurately depict geologic structure, surfical geology, and landforms of the Charleston County Region. Previously, many areas northeast and southwest of Charleston were originally mapped with a 20 foot contour interval. As a result, large areas within the National Elevation Dataset (NED) depict flat terraced topography where there was a lack of higher resolution elevation data. To overcome these data voids, the new DEM is supplemented with additional elevation data and break-lines derived from aerial photography and topographic maps. The resultant DEM is stored as a raster grid at uniform 10m horizontal resolution.

The elevation model contained in this publication was prodcued utilizing the ANUDEM algorthim. ANUDEM allows for the inclusion of contours, streams, rivers, lake and water body polygons as well as spot height data to control the development of the elevation model. A preliminary statistical analysis using over 788 vertical elevation check points, primarily located in the northeastern part of the study area, derived from USGS 7.5 Minute Topographic maps reveals that the final DEM, has a vertical accuracy of ±3.27 meters. A table listing the elevation comparison between the elevation check points and the final DEM is provided.

CONTENT

QUAD_24K

indexmap.pdf – Adobe Acrobat (.pdf) file of the 1:24,000 scale USGS quadrangle boundaries of the study area.

You will need Adobe Reader to view this file. Download a copy of the latest version of Adobe Reader for free.

DEM_DATA

char_dem.e00 – 10 meter elevation data stored in ArcInfo export format (.e00)

PLOTFILE

sc_dem_map.pdf – Map plot of color shaded relief 10 meter DEM stored in Adobe Acrobat (.pdf) file format. File size (30.8 MB)

ELEVATION ACCURACY REPORT TABLE

cdem_ngs_rmse.xls – Microsoft Excel spreadsheet containing elevation comparison between checkpoint elevations and Charleston DEM data.

METADATA

char_dem_meta – FGDC compliant metadata file describing the 10m DEM.

SHAPEFILES

bound_shp – shapefile of 1:24,000 - scale USGS quadrangle boundaries of the study area.

NGS_check_pts.shp – Shapefile of National Geodetic Survey (NGS) vertical control points in the study area.

Readme.txt - Text only readme file that explains the contents of the data files.

Version History

Disclaimer

Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

References to non-USGS products, services and tradenames are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

A low resolution map plot of color shaded relief 10 meter DEM stored in Adobe Acrobat (.pdf) file format.

File Size (4.50 MB)

U.S. Department of the Interior | U.S. Geological Survey
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