activeCat: Active category

In terra: Spatial Data Analysis

Active category

Description

Get or set the active category of a multi-categorical SpatRaster layer

Usage

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

Arguments

x	SpatRaster
layer	positive integer, the layer number or name
value	positive integer or character, indicating which column in the categories to use. Note that when a number is used this index is zero based, and "1" refers to the second column. This is because the first column of the categories has the cell values, not categorical labels

Value

integer

See Also

levels, cats

Examples

set.seed(0)
r <- rast(nrows=10, ncols=10)
values(r) <- sample(3, ncell(r), replace=TRUE) + 10
d <- data.frame(id=11:13, cover=c("forest", "water", "urban"), letters=letters[1:3], value=10:12)
levels(r) <- d

activeCat(r)
activeCat(r) <- 3
activeCat(r)

terra documentation built on Oct. 13, 2023, 5:08 p.m.