raster (version 1.9-70)

sampleRandom: Random sample

Description

Take a random sample from the cell values of a Raster* object (without replacement).

Usage

sampleRandom(x, size, ...)

Arguments

x

a Raster object

size

positive integer giving the number of items to choose.

...

Additional arguments: na.rm Logical. If TRUE (the default), NA values are removed from random sample ext Extent. To limit regular sampling to the area within the extent cells

Value

• A vector, matrix (if cells=TRUE or x is a multi-layered object), or a SpatialPointsDataFrame (if sp=TRUE )

Details

With na.rm=TRUE, the returned sample may be smaller than requested

See Also

sampleRegular

Examples

Run this code

r <- raster(system.file("external/test.grd", package="raster"))
 sampleRandom(r, size=10)
 s <- stack(r, r)
 sampleRandom(s, size=10, cells=TRUE, sp=TRUE)

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