unique: Unique values

In terra: Spatial Data Analysis

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 signature 'SpatRaster'
unique(x, incomparables=FALSE, na.rm=TRUE, as.raster=FALSE) 

## S4 method for signature 'SpatVector'
unique(x, incomparables=FALSE, ...) 

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
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

Value

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

If x is a SpatVector: SpatVector

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)

terra documentation built on Jan. 17, 2023, 5:18 p.m.