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 then the sampled values

sp

logical. If TRUE, a SpatialPointsDataFrame is returned

useGDAL

logical. If TRUE, GDAL is used to sample in some cases. This is quicker, but can result in values for a different set of cells than when useGDAL=FALSE. Only for rasters that are accessed via rgdal, and are not rotated. When TRUE arguments cells, xy, and sp are ignored (i.e., FALSE

...

additional arguments. None implemented

Value

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)

# NOT RUN { r <- raster(system.file("external/test.grd", package="raster"))
v <- sampleRegular(r, size=100)
x <- sampleRegular(r, size=100, asRaster=TRUE)
# }