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

# S4 method for Raster sampleRandom(x, size, na.rm=TRUE, ext=NULL, cells=FALSE, rowcol=FALSE, xy=FALSE, sp=FALSE, asRaster=FALSE, ...)

Raster* object

positive integer giving the number of items to choose

logical. If TRUE (the default), NA values are removed from random sample

TRUE

NA

Extent object. To limit regular sampling to the area within the extent

logical. If TRUE, sampled cell numbers are also returned

logical. If TRUE, sampled row and column numbers are also returned

logical. If TRUE, coordinates of sampled cells are also returned

logical. If TRUE, a SpatialPointsDataFrame is returned

logical. If TRUE, a Raster* object is returned with random cells with values, all other cells with NA

Additional arguments as in writeRaster. Only relevant when asRaster=TRUE

writeRaster

asRaster=TRUE

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

cells=TRUE

x

sp=TRUE

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

na.rm=TRUE

sampleRegular, sampleStratified

# NOT RUN { r <- raster(system.file("external/test.grd", package="raster")) sampleRandom(r, size=10) s <- stack(r, r) sampleRandom(s, size=5, cells=TRUE, sp=TRUE) # }

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