labcon {adehabitat} | R Documentation

## Labelling Connected Features

### Description

This function attributes unique labels to pixels belonging to connected features on a map of class `asc`.

### Usage

    labcon(x)

### Arguments

`x` | an object of class `asc`

### Value

Returns a matrix of class `asc`, of type `"factor"`, with a number of levels equals to the number of connected components

### Author(s)

Clément Calenge calenge@biomserv.univ-lyon1.fr

### See Also

`as.asc`

### Examples

      data(puechabon)
      hr <- getsahrlocs(puechabon$sahr, "hr")
      u <- getkasc(hr, "Jean")
      image(u)

      ## numbering of the connected components
      p <- labcon(u)
      nlevels(p)
      image(p)

      ##  stores the first component
      c1 <- p
      c1[c1 != 1] <- NA
      image(c1)

      ##  stores the second component
      c2 <- p
      c2[c2 != 2] <- NA
      image(c2)

[Package adehabitat version 1.3 Index]