Articles by dylan

AQP News and Updates

March 12, 2013 | dylan

The AQP family of R packages has seen a lot of development over the last 3 months. Some of the highlights include: HTML manual pages with syntax-highlighting and figures, c/o knitr new vignettes: "dealing with bad data", gridded SSURGO (gSSURGO) demo,... [Read more...]

Visualizing CA Snow Survey Data in R

January 14, 2013 | dylan

The CDEC website provides access to a wide range in hydrologic data (stream flow, snow survey, etc.) collected in California. The following code and functions (attached at the bottom of the page) illustrate how to query CDEC, and graphically compare th... [Read more...]

New AQP Tutorials

January 4, 2013 | dylan

Soil Series Extent Several new AQP-related tutorials have been posted to the R-Forge project page. SoilProfileCollection class/method documentation soil series extent mapping examples read more [Read more...]

Basic Simulation of Soil Profile Data in R via AQP

December 19, 2012 | dylan

Something fun to play with before the new year: experimental code in aqp for simulating soil profile data from a single "template" profile. The basic idea: simulate horizon thickness data using a family of Gaussian functions with mean defined by horizo... [Read more...]

Summarizing Circular Data in R: Aspect Angle

October 10, 2012 | dylan

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 ... [Read more...]

Compiling Source Packages on R 2.15.x / Mac OS 10.5.x

August 31, 2012 | dylan

For some reason R is not happy with its 64-bit cousin when installing source packages: * installing *source* package ‘XMLSchema’ ... ** R ** inst ** preparing package for lazy loading ** help *** installing help indices ** building package indices ** installing vignettes ** testing if installed package can be loaded *** arch - i386 *** arch - x86_64 /Library/Frameworks/... [Read more...]

Compiling rgdal on Mac OS 10.5

August 31, 2012 | dylan

Why do I always forget how to do this? R CMD INSTALL rgdal --configure-args="--with-gdal-config=/Library/Frameworks/GDAL.framework/Versions/Current/unix/bin/gdal-config --with-proj-include=/Library/Frameworks/PROJ.framework/Versions/4/Headers/ --with-proj-lib=/Library/Frameworks/PROJ.framework/Versions/Current/unix/lib/" You will need to adjust the paths based on your ... [Read more...]

AQP Kick-Start

March 27, 2012 | dylan

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. read more [Read more...]

Dissimilarity Between Soil Profiles: A Closer Look

March 23, 2012 | dylan

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 / soilDB Demo: Dueling Dendrograms

March 14, 2012 | dylan

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 | dylan

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...]
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