Center for Spatial Analysis Technologies

Digital Elevation Model 1:250,000

Description Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard DEM consists of a regular array of elevations cast on a designated coordinate projection system. The DEM data are stored as a series of profiles in which the spacing of the elevations along and between each profile is in regular whole number intervals. The normal orientation of data is by columns and rows. Each column contains a series of elevations ordered from south to north with the order of the columns from west to east. Fourteen 1-degree DEM (3- by 3-arc second data spacing) provides coverage in 1- by 1-degree blocks. The data are paneled together and clipped to the boundary of the State of Georgia. Data are posted every 3-arc seconds (60-90 meters).
	Screensize image file (916x1024 pixels)
	100 dpi image file (3400x3800 pixels)
	Data: 38 MB Zipped, 909 MB Unzipped, 37 MB Actual Size
	Data as GRID 17 MB Zipped, 37 MB Actual Size
	View Metadata

U.S. Department of the Interior | U.S. Geological Survey
URL: http://csat.er.usgs.gov/statewide/layers/dem250.html
Page Contact Information: webmaster-ga@usgs.gov
Page Last Modified: Monday, 05-Jun-2006 17:23:49 EDT