terra (version 1.0-10)

plot: Plot a SpatRaster

Description

Plot the values of a SpatRaster to make a map

Usage

# S4 method for SpatRaster,numeric
plot(x, y=1, col, type, mar=NULL, legend=TRUE, axes=TRUE, plg=list(), 
     pax=list(), maxcell=50000, smooth=FALSE, range=NULL, levels=NULL, fun=NULL, 
     colNA=NULL, alpha=NULL, ...)
# S4 method for SpatRaster,missing
plot(x, y, maxcell=50000, main, mar=NULL, nc, nr, maxnl=16, ...)

Arguments

x

SpatRaster

y

missing or positive integer or name indicating the layer(s) to be plotted

col

character. Colors

type

character. Type of map/legend. One of "continuous", "classes", or "interval"

mar

numeric vector of lenght 4 to set the margins of the plot (to make space for the legend). The default is (3.1, 3.1, 2.1, 7.1) for a single plot with a legend and (3.1, 3.1, 2.1, 2.1) otherwise. When multiple layers are plotted, the defaults are Use mar=NA to not set the margins

legend

logical. Draw a legend?

axes

logical. Draw axes?

plg

list with parameters for drawing the legend. See the arguments for legend

pax

list with parameters for drawing axes. See the arguments for axis

maxcell

positive integer. Maximum number of cells to use for the plot

smooth

logical. If TRUE the cell values are smoothed (for continuous legend)

range

numeric. minimum and maximum values to be used for the continuous legend

levels

character. labels to be used for the classes legend

fun

function to be called after plotting each SpatRaster layer to add something to each map (such as text, legend, lines). For example, with SpatVector v, you could do fun=function() lines(v). The function may have one argument, representing the the layer that is plotted (1 to the number of layers)

colNA

character. color for the NA values

alpha

numeric between 0 and 1 to set the transparency for all colors (0 is transparent, 1 is opaque)

nc

positive integer. Optional. The number of columns to divide the plotting device in (when plotting multiple layers)

nr

positive integer. Optional. The number of rows to divide the plotting device in (when plotting multiple layers)

main

character. Main plot titles (one for each layer to be plotted)

maxnl

positive integer. Maximum number of layers to plot (for a multi-layer object)

...

arguments passed to plot("SpatRaster", "numeric") and additional graphical arguments

See Also

image, plotVector, scatterplot, sbar

Examples

# NOT RUN {
f <- system.file("ex/elev.tif", package="terra") 
r <- rast(f)
plot(r)

plot(r, type="interval")

e <- c(6.3, 6.35, 49.9, 50.1)
plot(r, plg=list(ext=e, title="Title\n", title.cex=1.25), pax=list(sides=1:2))


d <- classify(r, c(100,200,300,400,500,600))
plot(d, type="classes")

plot(d, type="interval", breaks=1:5) 
plot(d, type="interval", breaks=c(1,4,5), plg=list(legend=c("1-4", "4-5"))) 
plot(d, type="classes", plg=list(legend=c("Mr", "Xx", "As", "Zx", "Bb"), x="bottomright"))

x <- trunc(r/200)
x <- as.factor(x)
levels(x) <- c("earth", "wind", "fire")
plot(x, plg=list(x="topright"),mar=c(2,2,2,2))

# two plots with the same legend
dev.new(width=6, height=4, noRStudioGD = TRUE)
par(mfrow=c(1,2))
plot(r, range=c(50,600))
plot(r/2, range=c(50,600))

# as you only need one legend:
par(mfrow=c(1,2))
plot(r, range=c(50,600), mar=c(4, 3, 4, 3), plg=list(shrink=0.9, cex=.8), 
	pax=list(sides=1:2, cex.axis=.6))
#text(182500, 335000, "Two maps, one plot", xpd=NA)
plot(r/2, range=c(50,600), mar=c(4, 2, 4, 4), legend=FALSE, 
	pax=list(sides=c(1,4), cex.axis=.6))
# }