raster (version 1.9-19)

sampleRegular: Regular sample

Description

Take a systematic sample from a Raster* object.

Usage

sampleRegular(x, size, ext=NULL, cells=FALSE, asRaster=FALSE)

Arguments

x

a Raster object

size

positive integer giving the number of items to choose.

ext

Extent. To limit regular sampling to the area within that box

cells

Logical. Also return sampled cell numbers (if asRaster=FALSE)

asRaster

Logical. If TRUE, a RasterLayer or RasterBrick is returned, rather then the sampled values

Value

• A vector, matrix (if cells=TRUE; or for a multi-layered object), or RasterLayer (if asRaster=TRUE)

See Also

sampleRandom

Examples

r <- raster(system.file("external/test.grd", package="raster"))
 v <- sampleRegular(r, size=100)
 x <- sampleRegular(r, size=100, asRaster=TRUE)