Blog Archives

Terrain Classification Experiment 2: GRASS, R, and the raster package

May 24, 2011
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Terrain Classification Experiment 2: GRASS, R, and the raster package

Quick post on terrain classification, based on some trouble folks were having with a previous example on Windows. With the spgrass6 package, raster stacks are created by loading several GRASS files at once: x <- readRAST6(vname=c('beam_sum_m...

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First-Cut Approach to Synchronizing Field Notes with GPS Data

May 9, 2011
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After a week's worth of work in the field, I typically have several pages of hand-written field notes that are associated with GPS waypoints-- badly in need of some kind of transcription/organization. I have yet to find a simple approach for bringing t...

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Importing Weather Data from Wunderground

May 9, 2011
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Importing Weather Data from Wunderground

Wunderground Example The Wunderground.com website offers several creative interfaces to current and historic weather information. One of the more interesting features is the URL-based interface to personal weather stations. As far as I can tell, the Wu...

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Visualizing Terrain Surface Indicies with Scaled Arrows

April 30, 2011
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Visualizing Terrain Surface Indicies with Scaled Arrows

Hamish Bowman recently posted a new GRASS module (d.barb) that can be used to depict the direction and magnitude components of some vector (e.g. wind field) along a raster surface or at points in space. An example (c/o Hamish): read more

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GEOSTAT 2011 — Canberra

April 18, 2011
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GEOSTAT 2011 — Canberra

Just got back from the 2011 GEOSTAT summer school that recently took place in Canberra, Australia. Thanks to Tom Hengl for the invitation to co-teach the course, to the great folks at ANU who made it possible, and to all of the students who participat...

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A Lattice Panel Function for Filled Polygons that Accounts for Missing Data

March 28, 2011
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A Lattice Panel Function for Filled Polygons that Accounts for Missing Data

This is a quick update to some code posted while back, related to plotting filled polygons within a lattice panel function. After attempting to use the originally described function to plot data with NA, I quickly realized that a more robust approach w...

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Updates to SoilWeb Mobile: Distance from Nearest Map Unit Boundary

March 16, 2011
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Working on some new ideas on how map unit data can be summarized on small screens-- particularly for our mobile version of SoilWeb. The distance from the nearest map unit polygon boundary is now printed above mini soil profile sketches. This gives the ...

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Initial SoilWeb Concept on Paper

March 7, 2011
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Initial SoilWeb Concept on Paper

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Tips for Using our Google Earth Interface to SoilWeb

February 28, 2011
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Tips for Using our Google Earth Interface to SoilWeb

GE SoilWeb Demo The folks in Lincoln recently changed the links to the OSDs from http:// to https:// style URLs... which seems to cause problems for new versions of Google Earth. I have noticed that when clicking on soil profile sketches an error is re...

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Experimental S4 Classes and Methods added to AQP (Algorithms for Quantitative Pedology) Package

February 23, 2011
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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 ...

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