Blog Archives

PostGIS in Action Book Review

June 8, 2010
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PostGIS in Action Book Review

I was recently asked to review a soon to be published book on PostGIS, a spatial extension to the very popular Postgresql relational database. I was very excited about receiving an early copy of this book, as the authors have provided countless tips, ...

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An XML Representation of the Keys to Soil Taxonomy?

May 28, 2010
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An XML Representation of the Keys to Soil Taxonomy?

Western Fresno Soil Hierarchy: partial view of the hierarchy within the US Soil Taxonomic system Maybe this is just craziness, but wouldn't be neat to have an XML formatted version of the Keys to Soil Taxonomy? The format might look something like the ...

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Getting Parent Material Data out of SSURGO

May 27, 2010
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  Parent material data is stored within the copm and copmgrp tables. The copm table can be linked to the copmgrp table via the 'copmgrpkey' field, and the copmgrp table can be linked to the component table via the 'cokey' field. The following queries illustrate these table relationships, and show one possible strategy for extracting the parent material information...

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SQLite as an alternative to shapefiles, and some GPS fun in R

May 24, 2010
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Finally made it out to Folsom Lake for a fine day of sailing and GPS track collecting. Once I was back in the lab, I downloaded the track data with gpsbabel, and was ready to import the data into GRASS. # import GPX from GPS: gpsbabel -t -i...

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Annotating Lattice Box and Whisker Plots

April 28, 2010
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Annotating Lattice Box and Whisker Plots

bwplot annotation example Sometimes you want to add a little text to box and whisker plots produced by the lattice function bwplot(). Here is one approach. Could be optimized a bit more to reduce manual specification of some elements. Suggestions...

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Converting Alpha-Shapes into SP Objects

April 19, 2010
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Converting Alpha-Shapes into SP Objects

Just read about a new R package called alphahull (paper) that sounds like it might be a good candidate for addressing this request regarding concave hulls. Below are some notes on computing alpha-shapes and alpha-hulls from spatial data and converting the results returned by ashape() and ahull() into SP-class objects. Note that the functions...

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Estimating Missing Data with aregImpute() {R}

April 19, 2010
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  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 (so to speak) in the rows/columns that are...

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InfoChimps

March 7, 2010
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InfoChimps

This looks interesting: http://infochimps.org/search?query=soil

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Accessing Climate Change Data and a Custom Panel Function for Filled Polygons

March 4, 2010
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Accessing Climate Change Data and a Custom Panel Function for Filled Polygons

GCS Model Grids Recently finished some collaborative work with Vishal, related to visualizing climate change data for the SEI. This project was funded in part by the California Energy Commission, with additional technical support from the Google Earth Team. One of the final products was an...

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Yet Another plyr Example

March 4, 2010
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Yet Another plyr Example

another plyr example quantiles (0.05, 0.25, 0.5, 0.75, 0.95) of DSC by temperature bin There are plenty of good examples on how to use functions from the plyr package. Here is one more, demonstrating how to use ddply with a custom function. Note that there...

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