Scale values

Center and/or scale raster data. For details see scale

Usage

# S4 method for class 'SpatRaster'
scale(x, center=TRUE, scale=TRUE)

Arguments

x

SpatRaster

center

logical or numeric. If TRUE, centering is done by subtracting the layer means (omitting NAs), and if FALSE, no centering is done. If center is a numeric vector (recycled to nlyr(x)), then each layer of x has the corresponding value from center subtracted from it.

scale

logical or numeric. If TRUE, scaling is done by dividing the (centered) layers of x by their standard deviations if center is TRUE, and the root mean square otherwise. If scale is FALSE, no scaling is done. If scale is a numeric vector (recycled to nlyr(x)), each layer of x is divided by the corresponding value. Scaling is done after centering.

Value

SpatRaster

The result has attributes "scaled:center" and/or "scaled:scale", as in scale, when centering and/or scaling is requested.

See also

scale_linear

Examples

r <- rast(system.file("ex/logo.tif", package="terra"))   
s <- scale(r)
attr(s, "scaled:center")
#> [1] 182.2855 185.3509 192.8046
attr(s, "scaled:scale")
#> [1] 74.59471 73.11226 70.44815

## the equivalent, computed in steps
m <- global(r, "mean")
rr <- r - m[,1]
rms <- global(rr, "rms")
ss <- rr / rms[,1]