unique: Unique values

In raster: Geographic Data Analysis and Modeling

Description

This function returns the unique values in a RasterLayer object or the unique combinations of the layers in a multilayer object.

Usage

## S4 method for signature 'RasterLayer,missing'
unique(x, incomparables=FALSE, na.last=NA, progress="", ...) 

## S4 method for signature 'RasterStackBrick,missing'
unique(x, incomparables=FALSE, na.last=NA, progress="", ...) 

Arguments

x	Raster object
incomparables	must be missing. The default value FALSE is used. See unique
na.last	logical. for controlling the treatment of NAs. If TRUE, missing values in the data are put last; if FALSE, they are put first; if NA, they are removed.
progress	character. Use "text" or "window" for a progress indicator
...	additional arguments. as in unique

Value

vector or matrix

See Also

unique

Examples

r <- raster(ncol=10, nrow=10)
values(r) <- round(runif(ncell(r))*10)
unique(r)
u <- unique(stack(r, round(r/2)))
do.call(rbind, u)
lapply(u, unique)

Example output

Loading required package: sp
 [1]  0  1  2  3  4  5  6  7  8  9 10
     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11]
[1,]    0    1    2    3    4    5    6    7    8     9    10
[2,]    0    0    1    2    2    2    3    4    4     4     5
[[1]]
 [1]  0  1  2  3  4  5  6  7  8  9 10

[[2]]
[1] 0 1 2 3 4 5

raster documentation built on Aug. 23, 2019, 1:04 a.m.