Blog Archives

Modeling an Infant’s Feeding Schedule with Periodic Smoothing Splines

June 15, 2013
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Modeling an Infant’s Feeding Schedule with Periodic Smoothing Splines

Feeding Schedule While on paternity leave I had an opportunity to test out periodic smoothing splines (within the framework of generalized additive models) on an interesting time-series-- an infant's feeding schedule. read more

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Hillslope Position by Soil Series

June 5, 2013
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Soil survey data are typically built upon a foundation of soil-landscape relationships that have been verified in the field. read more

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AQP News and Updates

March 12, 2013
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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,...

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SoilWeb Updates

February 8, 2013
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SoilWeb Updates

New Label Style! Some recent updates to SoilWeb. New visualizations will be incorporated into SoilWeb soon. read more

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Visualizing CA Snow Survey Data in R

January 14, 2013
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Visualizing CA Snow Survey Data in R

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...

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New AQP Tutorials

January 4, 2013
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New AQP Tutorials

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 examplesread more

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Basic Simulation of Soil Profile Data in R via AQP

December 19, 2012
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Basic Simulation of Soil Profile Data in R via AQP

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...

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Automated OSD Lookup and Display via SoilWeb and AQP

November 7, 2012
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Automated OSD Lookup and Display via SoilWeb and AQP

Automated OSD lookup and display   UPDATED 2013-04-08This functionality it now available in the soilDB and sharpshootR packages. All code on this page is now superseded by the fetchOSD() and SoilTaxonomyDendrogram() functions.   UPDATED 201...

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Automated OSD Lookup and Display via SoilWeb and AQP

November 7, 2012
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Automated OSD Lookup and Display via SoilWeb and AQP

Automated OSD lookup and display   UPDATED 2013-04-08This functionality it now available in the soilDB and sharpshootR packages. All code on this page is now superseded by the fetchOSD() and SoilTaxonomyDendrogram() functions.   UPDATED 201...

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Summarizing Circular Data in R: Aspect Angle

October 10, 2012
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Summarizing Circular Data in R: Aspect Angle

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 ...

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