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Raster is a data format consisting of regular grids of values, usually stored in an image-like format.
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Replace NA's with 0 for large raster data using R?
I found this answer to Replacing NAs with 0 for raster data using R :
#getting a raster
library(raster)
f <- system.file("external/test.grd", package="raster")
f
r <- raster(f) #r is the object of class … 'raster' …