soil.texture.uk: Soil texture triangle plot using UK conventions

In plotrix: Various Plotting Functions

Soil texture triangle plot using UK conventions

Description

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

Usage

 soil.texture.uk(soiltexture = NULL, main = "",at = seq(0.1, 0.9, by = 0.1),
  axis.labels = c("percent sand", "percent silt", "percent clay"),
  tick.labels = list(l = seq(10, 90, by = 10), r = seq(10, 90, by = 10),
  b = seq(10, 90, by = 10)), show.names = TRUE,
  show.lines = TRUE, col.names = "gray", bg.names = par("bg"),
  show.grid = FALSE, col.axis = "black", col.lines = "gray",
  col.grid = "gray", lty.grid = 3, show.legend = FALSE, label.points = FALSE,
  point.labels = NULL, col.symbols = "black", pch = par("pch"),
  h1 = NA, h3 = NA, t1 = NA, t3 = NA, lwduk = 2, xpos = NA, ypos = NA,
  snames = NA, cexuk = 1.1, ...)

Arguments

soiltexture	Matrix of soil textures where each row is a soil sample and three columns containing the percentages of the components sand, silt and clay in the range 0 to 100.
main	The title of the soil texture plot. Defaults to nothing.
at	Positions on the three axes where ticks will be drawn.
axis.labels	Labels for the axes.
tick.labels	The tick labels for the three axes.
show.names	Logical - whether to show the names 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.
col.names	Color of the soil names. Defaults to gray.
bg.names	Color to use when drawing a blank patch for the names of soil types.
show.grid	Logical - whether to show grid lines at each 10 level of each soil component.
col.axis	Color of the triangular axes, ticks and labels.
col.lines	Color of the boundary lines. Defaults to gray.
col.grid	Color of the grid lines. Defaults to gray.
lty.grid	Type of line for the grid. Defaults to dashed.
show.legend	Logical - whether to display a legend.
label.points	Logical - whether to call thigmophobe.labels to label the points.
point.labels	Optional labels for the points or legend.
col.symbols	Color of the symbols representing each value.
pch	Symbols to use in plotting values.
h1,h3,t1,t3	Points used in drawing boundaries for soil types.
lwduk	Line width for the boundaries
xpos,ypos	Positions for the soil type labels.
snames	Soil type labels.
cexuk	Character expansion for the soil type labels.
...	Additional arguments passed to triax.points and then ‘⁠points⁠’.

Details

‘⁠soil.texture.uk⁠’ displays a triangular plot area on which soil textures defined as proportions of sand, silt and clay can be plotted. It is similar to the ‘⁠soil.texture⁠’ function but uses the UK display conventions.

Value

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

Author(s)

Julian Stander

See Also

triax.plot

Examples

 soils.sw.percent<-data.frame(
  Sand=c(67,67,66,67,36,25,24,59,27,9,8,8,20,
  45,50,56,34,29,39,41,94,98,97,93,96,99),
  Silt=c(17,16,9,8,39,48,54,27,46,70,68,68,66,
  34,30,24,48,53,46,48,2,2,2,4,1,1),
  Clay=c(16,17,25,25,25,27,22,14,27,21,24,24,
  14,21,20,20,18,18,15,11,4,0,1,3,3,0))
 soils.sw.cols <- c(1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3,
  3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6)
 soils.sw.names <- c("Ardington","Astrop","Atrim",
  "Banbury","Beacon","Beckfoot")
 soil.texture.uk(soils.sw.percent,
  main = "Ternary Diagram for Some Soils from South West England",
  col.lines = "black", col.names = "black", show.grid = TRUE,
  col.grid = "blue", lty.grid = 2,  pch = 16, cex = 1.0,
  col.symbols = soils.sw.cols, h1 = NA, h3 = NA, t1 = NA,
  t3 = NA , lwduk = 2, xpos = NA, ypos = NA,
  snames = NA, cexuk = 1.1)
 legend("topleft", legend = soils.sw.names, col = 1:max(soils.sw.cols),
  pch = 16, cex = 1.1, title = "Location", bty = "n")

plotrix documentation built on Nov. 10, 2023, 5:07 p.m.