symdif: Symetrical difference
In miraisolutions/raster: Geographic Data Analysis and Modeling

Description Usage Arguments Value Author(s) See Also Examples

Symetrical difference of SpatialPolygons* objects

1 2	## S4 method for signature 'SpatialPolygons,SpatialPolygons' symdif(x, y, ...)

`x`	SpatialPolygons* object
`y`	SpatialPolygons* object
`...`	Additional SpatialPolygons* object(s)

SpatialPolygons*

Robert J. Hijmans

erase

#SpatialPolygons
if (require(rgdal) & require(rgeos)) {
	p <- shapefile(system.file("external/lux.shp", package="raster"))
	b <- as(extent(6, 6.4, 49.75, 50), 'SpatialPolygons')
	projection(b) <- projection(p)
	sd <- symdif(p, b)
	plot(sd, col='red')
}