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Company : United States Naval Academy
File Name : Guth.pdf
Size : 1821923
Type : application/pdf
Date : 08-Jun-2010
Downloads : 4

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Featured Paper by

Peter Guth

Many common digital elevation models (DEMs) use geographic coordinates, including NED, DTED, SRTM, GDEM, and NEXTMAP, with horizontal spacings in the range of 1/9" to 3". Many GIS operations, such as slope/aspect, reflectance or hillshade mapping, and viewsheds, require geometric knowledge of the relationship between horizontal and vertical spacing. Published discussions implicitly assume a rectangular UTM or UTM-like grid because they refer to a single value for data spacing, and some commercial software either requires reinterpolation to UTM before algorithms will work or allows only a single factor to relate degrees to meters, ignoring the significant changes that occur with latitude.
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