terra (version 1.6-17)

colors: Color table

Description

Get or set color table(s) associated with a SpatRaster. Color tables are used for associating colors with values, for use in mapping (plot).

Usage

# S4 method for SpatRaster
coltab(x)
# S4 method for SpatRaster
coltab(x, layer=1)<-value
# S4 method for SpatRaster
has.colors(x)

Value

data.frame

Arguments

x

SpatRaster

layer

positive integer, the layer number or name

value

a two-column data.frame (first column the cell value, second the color); a vector of colors (the first one is the color for value 0 and so on); or a three (red,green,blue) or four (alpha) column data.frame also from 0 to n; or NULL to remove the color table

Examples

r <- rast(ncols=3, nrows=2, vals=0:5)
coltb <- data.frame(t(col2rgb(rainbow(6, end=.9), alpha=TRUE)))
coltb

plot(r)

has.colors(r)
coltab(r) <- coltb
plot(r)
has.colors(r)

tb <- coltab(r)
class(tb)
dim(tb[[1]])