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## Terrain Analysis## Hillslope Position by Soil SeriesSubmitted by dylan on Wed, 2013-06-05 18:34.
Soil survey data are typically built upon a foundation of soil-landscape relationships that have been verified in the field. ( categories: )
## Summarizing Circular Data in R: Aspect AngleSubmitted by dylan on Wed, 2012-10-10 15:26.
The orientation of terrain surface (aspect) can have dramatic effects on landscape-scale variation in soil temperature and moisture. Summarizing aspect angle is complicated by the fact that sampled values are measured on a circular scale. The circular package for An example function is presented below that demonstrates several components of the circular package: special data structures, summary functions, plotting functions and their application to circular data derived from measurements collected by compass. Spread and central tendency are depicted with a combination of circular histogram and kernel density estimate. The circular mean, and relative confidence in that mean are depicted with an arrow: longer arrow lengths correspond to greater confidence in the mean. ( categories: )
## Terrain shape indices depicted by scaled arrowsSubmitted by dylan on Sat, 2011-04-30 14:57.
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## Using R and r.mapcalc (GRASS) to Estimate Mean Topographic CurvatureSubmitted by dylan on Tue, 2010-08-03 20:51.
Recently I was re-reading a paper on predictive soil mapping (Park et al, 2001), and considered testing one of their proposed terrain attributes in GRASS. The attribute, originally described by Blaszczynski (1997), is the distance-weighted mean difference in elevation applied to an n-by-n window of cells:
## Elevation surface (left) and resulting mean curvature estimate (right)Submitted by dylan on Sun, 2010-08-01 23:23.
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## Rangeland Soil Management and HydrologySubmitted by vbullard on Thu, 2009-06-11 18:30.
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