Set the NA value of a RasterLayer

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Description

NAvalue returns the value that is used to write NA values to disk (in 'raster' type files). If you set the NA value of a Raster* object, this value will be interpreted as NA when reading the values from a file. Values already in memory will not be affected.

If the NA value is smaller than zero, all values smaller or equal to that number will be set to NA.

Usage

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NAvalue(x) <- value
NAvalue(x)

Arguments

x

A Raster object

value

the value to be interpreted as NA; set this before reading the values from the file. Integer values are matched exactly; for decimal values files any value <= the value will be interpreted as NA

Value

Returns or set the NA value used for storage on disk.

Examples

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r1 <- raster(system.file("external/rlogo.grd", package="raster"))
r2 <- r1
NAvalue(r2)
NAvalue(r2) <- 255
#plot(r1)
#x11()
#plot(r2)

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