colors: Color table

colorsR Documentation

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 signature 'SpatRaster'
coltab(x)

## S4 replacement method for signature 'SpatRaster'
coltab(x, layer=1)<-value

## S4 method for signature 'SpatRaster'
has.colors(x)

Arguments

x

SpatRaster

layer

positive integer, the layer number or name

value

a two-column data.frame (first column the cell value, the second column 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

Value

data.frame

Examples

r <- rast(ncols=3, nrows=2, vals=1:6)
coltb <- data.frame(value=1:6, col=rainbow(6, end=.9))
coltb

plot(r)

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

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

terra documentation built on Dec. 2, 2022, 5:13 p.m.