Posts Tagged ‘ Soil Survey ’

soilDB Demo: Processing SSURGO Attribute Data with SDA_query()

April 26, 2012
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soilDB Demo: Processing SSURGO Attribute Data with SDA_query()

Mapping near Paloma, CA This image has nothing to do with the following content. A quick example of how to use the USDA-NRCS soil data access query facility (SDA), via the soilDB package for R. The following code describes how to get component-level so...

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Dissimilarity Between Soil Profiles: A Closer Look

March 23, 2012
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Dissimilarity Between Soil Profiles: A Closer Look

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...

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A Graphical Explanation of how to Interpret a Dendrogram

March 15, 2012
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A Graphical Explanation of how to Interpret a Dendrogram

Dendrograms are a convenient way of depicting pair-wise dissimilarity between objects, commonly associated with the topic of cluster analysis. This is a complex subject that is best left to experts and textbooks, so I won't even attempt to cover it her...

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AQP / soilDB Demo: Dueling Dendrograms

March 14, 2012
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AQP / soilDB Demo: Dueling Dendrograms

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...

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AQP Demo: Interfacing with PedonPC Databases using the ‘soilDB’ Package

January 12, 2012
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Here is a quick, draft demo on extracting soils data from a PedonPC database, and performing some common analysis with functions from AQP. The newly released soilDB package makes it possible to rapidly extract soils data from PedonPC, local NASIS, and ...

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AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !

December 22, 2011
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AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !

Version 1.0 of AQP is nearly ready-- after nearly 3 years of development, 2 years on R-Forge, and 1+ year on CRAN. Just pushed version 0.9-9 to R-Forge, and it should be on CRAN within a couple days. Recent changes are listed below, clipped from the NE...

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Logistic Power Peak (LPP) Simulated Soil Profiles

November 12, 2011
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Logistic Power Peak (LPP) Simulated Soil Profiles

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...

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Soil-Landscape Block Diagrams in SoilWeb

September 16, 2011
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Soil-Landscape Block Diagrams in SoilWeb

Users of our Google Earth interface to USDA-NCSS soils information will now see links to soil-landscape block diagrams listed within map unit descriptions. Automated Linking to NCSS Block Diagrams read more

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Soil Series Query for SoilWeb

September 16, 2011
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Soil Series Query for SoilWeb

A map depicting the spatial distribution of a given soil series can be very useful when working on a new soil survey, updating an old one, or searching for specific soil characteristics. We have recently added a soil series query facility to SoilWeb, w...

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Saving Chunks of SSURGO Data in SoilWeb for Google Earth

June 28, 2011
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Saving Chunks of SSURGO Data in SoilWeb for Google Earth

SoilWeb is an interactive, multifaceted interface to USDA-NCSS soil survey information. Our SoilWeb application for Google Earth streams soil map units and point data as you navigate across the lower '48 states. Currently, our system imposes a 30,000 ...

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