Subset layers in a Raster* object

Extract a set of layers from a RasterStack or RasterBrick object.

# S4 method for Raster
subset(x, subset, drop=TRUE, filename='', ...)

# S4 method for RasterStack
subset(x, subset, drop=TRUE, filename='', ...)

Arguments

x

RasterBrick or RasterStack object

subset

integer or character. Should indicate the layers (represented as integer or by their name)

drop

If TRUE, a selection of a single layer will be returned as a RasterLayer

filename

character. Output filename (optional)

...

additional arguments as for writeRaster

Value

Raster* object

See also

dropLayer

Examples

s <- stack(system.file("external/rlogo.grd", package="raster"))
sel <- subset(s, 2:3)

# Note that this is equivalent to
sel2 <- s[[2:3]]


# and in this particular case:
sel3 <- dropLayer(s, 1)

nlayers(s)
#> [1] 3
nlayers(sel)
#> [1] 2

# effect of 'drop=FALSE' when selecting a single layer
sel <- subset(s, 2)
class(sel)
#> [1] "RasterLayer"
#> attr(,"package")
#> [1] "raster"
sel <- subset(s, 2, drop=FALSE)
class(sel)
#> [1] "RasterStack"
#> attr(,"package")
#> [1] "raster"