subsetHz,SoilProfileCollection-method

subsetHz

<code>subsetHz()</code> is a function used for extracting horizons from a SoilProfileCollection based on logical criteria.

The Algorithms for Quantitative Pedology (AQP) project was started in 2009 to organize a loosely-related set of concepts and source code on the topic of soil profile visualization, aggregation, and classification into this package (aqp). Over the past 8 years, the project has grown into a suite of related R packages that enhance and simplify the quantitative analysis of soil profile data. Central to the AQP project is a new vocabulary of specialized functions and data structures that can accommodate the inherent complexity of soil profile information; freeing the scientist to focus on ideas rather than boilerplate data processing tasks <doi:10.1016/j.cageo.2012.10.020>. These functions and data structures have been extensively tested and documented, applied to projects involving hundreds of thousands of soil profiles, and deeply integrated into widely used tools such as SoilWeb <https://casoilresource.lawr.ucdavis.edu/soilweb-apps>. Components of the AQP project (aqp, soilDB, sharpshootR, soilReports packages) serve an important role in routine data analysis within the USDA-NRCS Soil Science Division. The AQP suite of R packages offer a convenient platform for bridging the gap between pedometric theory and practice.

Dylan Beaudette

Algorithms for Quantitative Pedology

Pierre Roudier

Andrew Brown

subsetHz,SoilProfileCollection-method function

<dl><dt>x</dt>
<dd>a SoilProfileCollection</dd>
<dt>...</dt>
<dd>Comma-separated set of R expressions that evaluate as <code>TRUE</code> or <code>FALSE</code> in context of horizon data frame. Length for individual expressions matches number of horizons, in <code>x</code>.</dd>
<dt>drop</dt>
<dd>Default: <code>TRUE</code>. When <code>drop=FALSE</code> placeholder horizons (profile ID with all other values <code>NA</code>) are created where the specified filter results in removal of all horizons.</dd></dl>

Arguments

Subset the horizons in a SoilProfileCollection using logical criteria — subsetHz,SoilProfileCollection-method

<dl>

<dt>x</dt>
<dd>a SoilProfileCollection</dd>


<dt>...</dt>
<dd>Comma-separated set of R expressions that evaluate as <code>TRUE</code> or <code>FALSE</code> in context of horizon data frame. Length for individual expressions matches number of horizons, in <code>x</code>.</dd>


<dt>drop</dt>
<dd>Default: <code>TRUE</code>. When <code>drop=FALSE</code> placeholder horizons (profile ID with all other values <code>NA</code>) are created where the specified filter results in removal of all horizons.</dd>

</dl>

subsetHz,SoilProfileCollection-method: Subset the horizons in a SoilProfileCollection using logical criteria

Description

Usage

Value

Arguments

Details

Examples