terra (version 1.8-5)

unique: Unique values

Description

This method returns the unique values in a SpatRaster, or removes duplicates records (geometry and attributes) in a SpatVector.

Usage

# S4 method for SpatRaster
unique(x, incomparables=FALSE, digits=NA, na.rm=TRUE, as.raster=FALSE) 
# S4 method for SpatVector
unique(x, incomparables=FALSE, ...)

Value

If x is a SpatRaster: data.frame or list (if incomparables=FALSE)

If x is a SpatVector: SpatVector

Arguments

x

SpatRaster or SpatVector

incomparables

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

digits

integer. The number of digits for rounding the values before finding the unique values. Use NA means to not do any rounding

na.rm

logical. If TRUE, NaN is included if there are any missing values

as.raster

logical. If TRUE, a single-layer categorical SpatRaster with the unique values is returned

...

additional arguments passed on to unique

Examples

r <- rast(ncols=5, nrows=5)
values(r) <- rep(1:5, each=5)
unique(r)
s <- c(r, round(r/3))
unique(s)
unique(s,TRUE)

unique(s, as.raster=TRUE)


v <- vect(cbind(x=c(1:5,1:5), y=c(5:1,5:1)), 
		crs="+proj=utm +zone=1 +datum=WGS84")
nrow(v)
u <- unique(v)
nrow(u)

values(v) <- c(1:5, 1:3, 5:4)
unique(v)