sampleRegular | R Documentation |
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, ...)
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 |
asRaster |
logical. If |
sp |
logical. If |
... |
additional arguments. None implemented |
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
)
sampleRandom
, sampleStratified
r <- raster(system.file("external/test.grd", package="raster"))
v <- sampleRegular(r, size=100)
x <- sampleRegular(r, size=100, asRaster=TRUE)
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