writeRaster
).dataType(x)
dataType(x) <- value
RasterLayer
objectLOG1S
FALSE (0) TRUE (1)
INT1S
-127 127
INT1U
0 255
INT2S
-32,767 32,767
INT2U
0 65,534
INT4S
-2,147,483,647 2,147,483,647
INT4U
0 4,294,967,296
FLT4S
-3.4e+38 3.4e+38
FLT8S
-1.7e+308 1.7e+308
}
For all integer types, except the single byte types, the lowest (signed) or highest (unsigned) value is used to store NA
. Single byte files do not have NA
values. Logical values are stored as signed single byte integers, they do have an NA
value (-127)
INT4U
is available but they are best avoided as R does not support 32-bit unsigned integers.r <- raster(system.file("external/test.grd", package="raster"))
dataType(r)
s <- writeRaster(r, 'new.grd', datatype='INT2U', overwrite=TRUE)
dataType(s)
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