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CARTOGRAPHICA
2010

Automated Reduction of Visual Complexity in Small-Scale Relief Shading

13 years 9 months ago
Automated Reduction of Visual Complexity in Small-Scale Relief Shading
Shaded relief derived automatically from digital elevation models differs distinctly from traditional manual shading. Particularly at small scales, many small topographic details that are present in terrain models disturb the clear portrayal of the main relief features. Automatic shading is therefore not appropriate for high-quality cartographic products. This paper proposes a new method of generalizing digital elevation models for deriving small-scale shaded relief that resembles the manual style. The procedure consists of the following raster operations: undesirable topographic details are smoothed with low-pass filters, and the main landforms, such as ridgelines and valleys, are detected by curvature coefficients. Two secondary grids are derived, one exaggerating ridgelines, the other deepening valley bottoms, and the two grids are combined according to the character of the terrain; the grid with exaggerated ridgelines is used in mountainous areas, and the grid with deepened valley...
Anna M. Leonowicz, Bernhard Jenny, Lorenz Hurni
Added 28 Feb 2011
Updated 28 Feb 2011
Type Journal
Year 2010
Where CARTOGRAPHICA
Authors Anna M. Leonowicz, Bernhard Jenny, Lorenz Hurni
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