reclassify | R Documentation |
Reclassify values of a Raster* object. The function (re)classifies groups of values to other values. For example, all values between 1 and 10 become 1, and all values between 11 and 15 become 2 (see functions subs
and cut
for alternative approaches).
Reclassification is done with matrix rcl
, in the row order of the reclassify table. Thus, if there are overlapping ranges, the first time a number is within a range determines the reclassification value.
## S4 method for signature 'Raster'
reclassify(x, rcl, filename='', include.lowest=FALSE, right=TRUE, ...)
x |
Raster* object |
rcl |
matrix for reclassification. This matrix can have 3 or 2 columns. In a A |
filename |
character. Output filename (optional) |
include.lowest |
logical, indicating if a value equal to the lowest value in rcl (or highest value in the second column, for right = FALSE) should be included. The default is |
right |
logical, indicating if the intervals should be closed on the right (and open on the left) or vice versa. The default is |
... |
additional arguments as for |
Raster* object
subs, clamp, cut, calc
r <- raster(ncols=36, nrows=18)
values(r) <- runif(ncell(r))
# reclassify the values into three groups
# all values > 0 and <= 0.25 become 1, etc.
m <- c(0, 0.25, 1, 0.25, 0.5, 2, 0.5, 1, 3)
rclmat <- matrix(m, ncol=3, byrow=TRUE)
rc <- reclassify(r, rclmat)
# for values >= 0 (instead of > 0), do
rc <- reclassify(r, rclmat, include.lowest=TRUE)
# equivalent to
rc <- reclassify(r, c(-Inf,0.25,1, 0.25,0.5,2, 0.5,Inf,3))
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