scale.Rd
Center and/or scale raster data. For details see scale
# S4 method for SpatRaster
scale(x, center=TRUE, scale=TRUE)
SpatRaster
logical or numeric. If TRUE
, centering is done by subtracting the layer means (omitting NA
s), 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.
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.
SpatRaster
r <- rast(system.file("ex/logo.tif", package="terra"))
s <- scale(r)
## the equivalent, computed in steps
m <- global(r, "mean")
rr <- r - m[,1]
rms <- global(rr, "rms")
ss <- rr / rms[,1]