labcon function

Labelling Connected Features

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

labcon(x)

Arguments

• x: an object of class SpatialPixelsDataFrame with one column

Returns

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

Author(s)

Clement Calenge clement.calenge@ofb.gouv.fr

See Also

SpatialPixelsDataFrame-class for further information on the class SpatialPixelsDataFrame

Examples

data(lynxjura)
sa <- lynxjura$map[,1]

## build an image with separate components
sa[[1]][sa[[1]]<50] <- NA

## show the connected components
image(sa)
image(labcon(sa))