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soiltexture (version 1.0)

Functions for soil texture plot, classification and transformation

Description

"The Soil Texture Wizard" is a set of R functions designed to produce texture triangles (also called texture plots, texture diagrams, texture ternary plots), classify and transform soil textures data. These functions virtually allows to plot any soil texture triangle / classification into any triangle geometry (isosceles, right-angled triangles, etc.). This set of function is expected to be useful to people using soil textures data from different soil texture classification or different particle size systems. Several texture triangles are predefined: USDA; FAO (which is also the triangle for the soil map of Europe); Aisne (France); GEPPA (France); German triangle (Bodenkundliche Kartieranleitung 1994); Soil Survey of England and Wales (UK); Australian triangle; Belgian triangle; Canadian triangle; ISSS triangle; Romanian traingle. The Soil Texture Wizard is initially develloped from the functions 'soil.texture()' from the package 'plotrix' by Jim Lemon et al.

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Version

Install

install.packages('soiltexture')

Monthly Downloads

1,036

Version

1.0

License

GPL (>= 3)

Maintainer

Julien MOEYS

Last Published

August 18th, 2010

Functions in soiltexture (1.0)

TT.deg2rad

Function to convert angle in degree to angle in radian.
TT.geo.set

Internal. Takes "geo" values and assign them individually in the parent function.
TT.normalise.sum.X

Normalises the sum of the X particle size classes.
TT.switch

Internal. Used in the plot axis drawings.
TT.normalise.sum

Normalises the sum of the 3 particle size classes.
TT.points

Plot a soil texture data table as points on an existing texture plot.
TT.text.transf

Log-linear transformation of a soil texture data table between 2 particle size systems (3 classes).
TT.gen.op.set

Internal. Retrieve and set default values from options.
TT.css2xy

Converts texture data (3 classes) into x-y coordinates.
TT.get

Function to retrieve / get the default package parameters.
TT.classes

Plot the texture classes polygons in a texture triangle plot.
TT.blr.ps.lim

Internal. Create a tabular version of clay silt sand particle size limits.
TT.DJ.col

A function to obtaine a weight average 'mix' of different colors!
TT.data.test

Test the validity of some soil texture data table (3 particle size classes).
soiltexture-package

Functions for soil texture plot, classification and transformation
TT.env

TT env
TT.check.ps.lim.Xm

Internal. Check the consistency between 'base.ps.lim' and 'dat.ps.lim'.
TT.ifelse

Internal. Flexible version of ifelse.
TT.axis.arrows

Internal. Plot the axis' arrows of a texture triangle plot.
TT.dataset

Genetates a virtual cross correlated clay silt sand + Z dataset.
TT.geo.get

Internal. Retrieve and return the geometrical parameters from a list of parameter values (NULL or not).
TT.ticks

Internal. Plot the axis' ticks of a texture triangle plot.
TT.polygon.centroids

Determines the centroid of 1 polygon (in x-y coordinates).
TT.grid

Plot a grid at regular texture intervals inside an existing soil texture triangle.
TT.vertices.tbl

Returns the table of vertices of a texture classification system.
TT.vertices.plot

Plot the vertices of a texture classification system.
TT.locator

Interactive (mouse clic) retrieval the CLAY SILT SAND coordinate of points on a texture triangle.
TT.plot

Plot soil texture triangles / diagrams.
TT.kde2d

Calculated the 2D probabilty density on an x-y grid.
TT.auto.set

Internal. Retrieve and set default values for parameters (par() or not), when NULL.
TT.check.ps.lim

Internal. Check the consistency between 'base.ps.lim' and 'dat.ps.lim'.
TT.chemometrics.alr

Compute the additive log-ratio transformation of compositional data.
TT.iwd

Inverse weighted distance interpolation on a grid.
TT.classes.tbl

Returns the table of classes of a texture classification system.
TT.mahalanobis

Calculates the Mahalanobis distance between clay silt and sand.
TT.data.test.X

Test the validity of some soil texture data table (X particle size classes).
TT.blr.tx.check

Internal. Check the consistency between blr.tx and css.names.
TT.image

Wrapper for the contour() function adapted to texture triangles.
TT.baseplot

Internal. Create an empty plot scene for a texture triangle.
TT.dia2phi

Convert a soil particle diameter dia [micro-meters] into phi = -log2(dia/1000)
TT.edges

Internal. Plot the edges (bare axis) of a soil texture triangle.
TT.add

Function to add a new default package parameters.
TT.text

Plot text labels for each values of a soil texture data table on an existing texture plot.
TT.lines

Internal. Used to plot line elements of a texture plot axis, ticks, arrows, etc.
TT.text.transf.X

Log-linear transformation of a soil texture data table between 2 particle size systems (X classes).
TT.text.transf.Xm

Transformations of a soil texture data table between 2 particle size systems (X classes), various methods.
TT.phi2dia

Convert a soil particle phi value into diameter dia [micro-meters].
TT.polygon.area

Determines the area of 1 polygon (in x-y coordinates).
TT.contour

Wrapper for the contour() function adapted to texture triangles.
TT.xy2css

Internal. Convert point-data duplets (2 variables, x-y coordinaes) in Clay silta and sand coordinates.
TT.xy.grid

Internal. Create a grid in the x-y coordinate system.
TT.col2hsv

Convert any colors to hsv.
TT.par.op.set

Internal. Retrieve and set default values from options with default in "par()".
TT.points.in.classes

Classify a table of soil texture data according to a soil texture triangle.
TT.ticks.lab

Internal. Plot the axis ticks' labels of a texture triangle plot.
TT.str

Internal. Stretch or reshape the range of value of some data set.
TT.set

Function to change / set the default package parameters.