pedon data

AQP / soilDB Demo: Dueling Dendrograms

March 14, 2012 | 0 Comments

Previously, soil profile comparison methods from the aqp package only took into account horizon-level attributes. As of last week the profile_compare() function can now accommodate horizon and site-level attributes. In other words, it is now possible t... [Read more...]

Logistic Power Peak (LPP) Simulated Soil Profiles

November 12, 2011 | 0 Comments

A friend of mine recently published a very interesting article on the pedologic interpretation of asymetric peak functions fit to soil profile data (Myers et al., 2011). I won't bother summarizing or paraphrasing the article here, as the original artic... [Read more...]

Updates to the ‘aqp’ Package for R (version 0.98-3)

November 30, 2010 | 0 Comments

Just released an updated version of our 'aqp' package for quantitative soils investigations, available on CRAN and R-Forge. Some of the major changes are listed below: from the aqp NEWS file: -------------------------- aqp 0.98-1 (2010-11-23) --------... [Read more...]

Estimating Missing Data with aregImpute() {R}

April 19, 2010 | 0 Comments

  Missing Data Soil scientists routinely sample, characterize, and summarize patterns in soil properties in space, with depth, and through time. Invariably, some samples will be lost or sufficient funds required for complete characterization can run out. In these cases the scientist is left with a data table that contains holes (... [Read more...]

Interesting use of levelplot() for time series data

January 16, 2010 | 0 Comments

levelplot example: soil temperature (left) and moisture (right) Several recent articles appeared on the R-bloggers feed aggregator that demonstrated an interesting visualization of time series data using color. This style of visualization was readily adapted for the time series data I regularly collect (soil moisture and temperature), and quickly implemented ...
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New R-Forge Site for Quantitative Pedology

November 8, 2009 | 0 Comments

Just back from the annual meetings, and it looks like there is a significant interest in collaborative R coding of soils-related algorithms and visualization. A new R-forge site has been created to host Algorithms for Quantitative Pedology. Public release of the 'soil' package should be ready in a couple weeks. ...
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