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These functions can be used to get or set the scale (gain) and offset parameters used to transform values when reading raster data from a file. The parameters are applied to the raw values using the formula below:
value <- value * scale + offset
The default value for scale is 1 and for offset is 0. 'scale' is sometimes referred to as 'gain'.
Note that setting the scale and/or offset are intended to be used with values that are stored in a file. When values are memory, assigning scale or offset values will lead to the immediate computation of new values; in such cases it would be clearer to use Arith-methods.
# S4 method for SpatRaster
scoff(x)# S4 method for SpatRaster
scoff(x)<-value
matrix or changed SpatRaster
SpatRaster
two-column matrix with scale (first column) and offset (second column) for each layer. Or NULL to remove all scale and offset values
r <- rast(system.file("ex/elev.tif", package="terra"))
minmax(r)
scoff(r)
r[4603]
scoff(r) <- cbind(10, 5)
minmax(r)
scoff(r)
r[4603]
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