AQP Kick-Start
A fun kick-starter for anyone interested in working with soil profile data in R, via AQP. See in-line comments for details. Up next, profile slicing and aggregation.
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Visualization of Soil Properties
Dissimilarity Between Soil Profiles: A Closer Look
Continuing the previous discussion of pair-wise dissimilarity between soil profiles, the following demonstration (code, comments, and figures) further elaborates on the method. A more in-depth discussion of this example will be included as a vignette w... [Read more...]
AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !
Version 1.0 of AQP is nearly ready-- after nearly 3 years of development, 2 years on R-Forge, and 1+ year on CRAN. Just pushed version 0.9-9 to R-Forge, and it should be on CRAN within a couple days. Recent changes are listed below, clipped from the NE... [Read more...]
Experimental S4 Classes and Methods added to AQP (Algorithms for Quantitative Pedology) Package
Thanks to some help from Pierre Roudier, the aqp package now has some new S4-style classes and methods-- custom tailored to the complexities of soil profile data. These new classes/methods are only available in the aqp development branch, found on our ... [Read more...]
Updates to the ‘aqp’ Package for R (version 0.98-3)
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...]
A Visualization of Soil Taxonomy Down to the Subgroup Level
It turns out that you can generate a quasi-numerical distance between soil profiles classified according to Soil Taxonomy (or any other hierarchical system) using Gower's generalized dissimilarity metric. For example, taxonomic distances computed from ...
AQP Examples: Profile Visualization
Two examples of the output from the profile_plot() function, using data from the Sierra Foothill Region, CA.
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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... [Read more...]
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...
Interesting use of levelplot() for time series data
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 ...
New R-Forge Site for Quantitative Pedology
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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