Blog Archives

More AQP (algorithms for quantitative pedology) Examples

September 23, 2010
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The aqp package can be downloaded from R-Forge. read more

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AQP Examples: Profile Visualization

September 20, 2010
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Two examples of the output from the profile_plot() function, using data from the Sierra Foothill Region, CA. read more

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Soil Properties Visualized on a 1km Grid

August 31, 2010
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Soil Properties Visualized on a 1km Grid

Fresno Area Urban Areas vs Irrigated LCC: grey regions are current urban areas A couple of maps generated from a 1km gridded soil property database, derived from SSURGO data where available with holes filled with STATSGO data. Soil properties visualize...

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GRASS Can Make Pretty Maps

August 23, 2010
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GRASS Can Make Pretty Maps

I have posted a couple examples in the past on the topic of high quality map production from GRASS GIS-- usually via the Generic Mapping Tools. I am not sure why, but I have previously avoided using the traditional cartographic output module that is bu...

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What would a 25th, 50th, and 75th percentile soil profile look like?

August 11, 2010
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What would a 25th, 50th, and 75th percentile soil profile look like?

I have mentioned the AQP package in previous entries. One of the functions in this package generates aggregate soil profile data, from a collection of soil profiles that are related by some factor: common lithology, common landscape position, and so on...

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Just for Fun: Using R to Create Targets

August 10, 2010
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OK, not really science or soil-related, but a fun 5 minute use of R to make something you can use to improve your hand-eye coordination. read more

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New R Package ‘aqp’: Algorithms for Quantitative Pedology [updates]

August 9, 2010
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New R Package ‘aqp’: Algorithms for Quantitative Pedology [updates]

  Soils are routinely sampled and characterized according to genetic horizons (layers), resulting in data that are associated with principal dimensions: location (x,y), depth (z), and property space (p). The high dimensionality and grouped nature...

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Using R and r.mapcalc (GRASS) to Estimate Mean Topographic Curvature

August 3, 2010
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Using R and r.mapcalc (GRASS) to Estimate Mean Topographic Curvature

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 differe...

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R’s Normal Distribution Functions: rnorm and pals

July 14, 2010
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The rnorm() function in R is a convenient way to simulate values from the normal distribution, characterized by a given mean and standard deviation. I hadn't previously used the associated commands dnorm() (normal density function), pnorm() (cumulative...

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Updated SoilWeb for the iPhone + Alpha Android Version

June 15, 2010
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Major updates to the SoilWeb iPhone Application. read more

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