R/Arith.R

In geovec: Manipulation of geographic vector (points, lines, polygons) data

# Author: Robert J. Hijmans
# Date : November 2011
# Version 1.0
# Licence GPL v3


setMethod("+", signature(e1='SpatialPolygons', e2='SpatialPolygons'),
    function(e1, e2){ 
		combine(e1, e2)
	}
)

setMethod("*", signature(e1='SpatialPolygons', e2='SpatialPolygons'),
    function(e1, e2){ 
		intersect(e1, d2)
	}
)

setMethod("-", signature(e1='SpatialPolygons', e2='SpatialPolygons'),
    function(e1, e2){ 
		erase(e1, e2)
	}
)

setMethod("^", signature(e1='SpatialPolygons', e2='SpatialPolygons'),
    function(e1, e2){ 
		crop(e1, e2)
	}
)