soil.texture {plotrix}R Documentation

Soil texture triangle plot

Description

Display a soil texture triangle with optional grid, labels and soil texture points.

Usage

 soil.texture(soiltexture=NULL,
 show.names=TRUE,show.lines=TRUE,show.grid=FALSE,bg.names="white",main="",
 col.axis="black",col.names="gray",col.lines="gray",col.grid="gray",...)

Arguments

soiltexture Matrix of soil textures where each row is a soil sample and three columns contain the proportions of the components sand, silt and clay in the range 0 to 1 or percentages in the range 0 to 100.
show.names Logical - whether to show the name of different soil types within the soil triangle.
show.lines Logical - whether to show the boundaries of the different soil types within the soil triangle.
show.grid Logical - whether to show grid lines at each 10 level of each soil component.
bg.names Color to use when drawing a blank patch for the names of soil types. Defaults to white but the user may wish to use the plot background color.
main The title of the soil texture plot. Defaults to none.
col.axis Color of the triangular axes, ticks and labels.
col.names Color of the soil names. Defaults to gray.
col.lines Color of the boundary lines. Defaults to gray.
col.grid Color of the grid lines. Defaults to gray.
... Additional arguments passed to show.soil.texture or points.

Details

soil.texture displays a triangular plot area on which soil textures defined as proportions of sand, silt and clay can be plotted. Optional grid, vertex labels, soil type divisions and names may also be displayed. If a matrix of soil textures is present, this will be passed to show.soil.texture and the textures will be plotted.

Value

If soiltexture was included, a list of the x,y positions of the soil types plotted. If not, nil.

Author(s)

Sander Oom and Jim Lemon

See Also

get.soil.texture, show.soil.texture

Examples

 data(soils)
 soil.texture()
 if(dev.interactive()) par(ask=TRUE)
 main.title<-"DEFAULT"
 soil.texture(soils,main=main.title,pch=2)
 main.title<-"LINES AND NAMES"
 soil.texture(soils,main=main.title,show.lines=TRUE,show.names=TRUE,
  pch=3)
 main.title<- "GRID AND LEGEND"
 soil.texture(soils[1:6,],main=main.title,show.grid=TRUE,pch=4,
  col.symbols=1:6,show.legend=TRUE)
 if(dev.interactive()) par(ask=FALSE)

[Package plotrix version 2.0.2 Index]