unique.RdThis method returns the unique values in a SpatRaster, or removes duplicates records (geometry and attributes) in a SpatVector.
# S4 method for SpatRaster
unique(x, incomparables=FALSE, digits=NA, na.rm=TRUE, as.raster=FALSE)
# S4 method for SpatVector
unique(x, incomparables=FALSE, ...)SpatRaster or SpatVector
logical. If FALSE and x is a SpatRaster: the unique values are determined for all layers together, and the result is a matrix. If TRUE, each layer is evaluated separately, and a list is returned. If x is a SpatVector this argument is as for a data.frame
integer. The number of digits for rounding the values before finding the unique values. Use NA means to not do any rounding
logical. If TRUE, NaN is included if there are any missing values
logical. If TRUE, a single-layer categorical SpatRaster with the unique values is returned
additional arguments passed on to unique
If x is a SpatRaster: data.frame or list (if incomparables=FALSE)
If x is a SpatVector: SpatVector
r <- rast(ncols=5, nrows=5)
values(r) <- rep(1:5, each=5)
unique(r)
#> lyr.1
#> 1 1
#> 2 2
#> 3 3
#> 4 4
#> 5 5
s <- c(r, round(r/3))
unique(s)
#> lyr.1 lyr.1
#> 1 1 0
#> 2 2 1
#> 3 3 1
#> 4 4 1
#> 5 5 2
unique(s,TRUE)
#> [[1]]
#> [1] 1 2 3 4 5
#>
#> [[2]]
#> [1] 0 1 2
#>
unique(s, as.raster=TRUE)
#> class : SpatRaster
#> dimensions : 5, 5, 1 (nrow, ncol, nlyr)
#> resolution : 72, 36 (x, y)
#> extent : -180, 180, -90, 90 (xmin, xmax, ymin, ymax)
#> coord. ref. : lon/lat WGS 84
#> source(s) : memory
#> categories : label, lyr.1, lyr.1.1
#> name : label
#> min value : 1_0
#> max value : 5_2
v <- vect(cbind(x=c(1:5,1:5), y=c(5:1,5:1)),
crs="+proj=utm +zone=1 +datum=WGS84")
nrow(v)
#> [1] 10
u <- unique(v)
nrow(u)
#> [1] 5
values(v) <- c(1:5, 1:3, 5:4)
unique(v)
#> class : SpatVector
#> geometry : points
#> dimensions : 7, 1 (geometries, attributes)
#> extent : 1, 5, 1, 5 (xmin, xmax, ymin, ymax)
#> coord. ref. : +proj=utm +zone=1 +datum=WGS84 +units=m +no_defs
#> names : value
#> type : <int>
#> values : 1
#> 2
#> 3