Blog Archives

Temporal Trends in Soil Science Jargon — via Google Ngram Viewer

December 29, 2010
By
Temporal Trends in Soil Science Jargon — via Google Ngram Viewer

read more

Read more »

Customizing Maps in R: spplot() and latticeExtra functions

December 15, 2010
By
Customizing Maps in R: spplot() and latticeExtra functions

I recently noticed the new latticeExtra page on R-forge, which contains many very interesting demos of new lattice-related functionality. There are strong opinions about the "best" graphics system in R (base graphics, grid graphics, lattice, ggplot, et...

Read more »

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

November 30, 2010
By

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 »

Updated SoilWeb Usage Statistics

November 16, 2010
By
Updated SoilWeb Usage Statistics

Google Earth Access Trends: Daily Requests read more

Read more »

A Visualization of Soil Taxonomy Down to the Subgroup Level

September 29, 2010
By
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 ...

Read more »

More AQP (algorithms for quantitative pedology) Examples

September 23, 2010
By

The aqp package can be downloaded from R-Forge. read more

Read more »

AQP Examples: Profile Visualization

September 20, 2010
By

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

Read more »

Soil Properties Visualized on a 1km Grid

August 31, 2010
By
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 »

GRASS Can Make Pretty Maps

August 23, 2010
By
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...

Read more »

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

August 11, 2010
By
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...

Read more »