sampleRegular function

Regular sample

Take a systematic sample from a Raster* object.

## S4 method for signature 'Raster'
sampleRegular(x, size, ext=NULL, cells=FALSE, xy=FALSE, asRaster=FALSE, 
            sp=FALSE, ...)

Arguments

• x: 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)
• xy: logical. If TRUE, coordinates of sampled cells are also returned
• asRaster: logical. If TRUE, a RasterLayer or RasterBrick is returned, rather than the sampled values
• sp: logical. If TRUE, a SpatialPointsDataFrame is returned
• ...: additional arguments. None implemented

Returns

A vector (single layer object), matrix (multi-layered object; or if cells=TRUE, or xy=TRUE), Raster* object (if asRaster=TRUE), or SpatialPointsDataFrame (if sp=TRUE)

See Also

sampleRandom, sampleStratified

Examples

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