rgeos (version 0.3-22)

gArea: Area of Geometry

Description

Calculates the area of the given geometry.

Usage

gArea(spgeom, byid=FALSE)

Arguments

spgeom

sp object as defined in package sp

byid

Logical determining if the function should be applied across subgeometries (TRUE) or the entire object (FALSE)

Value

area slot of the Polygons class as this value does not subtract the area of any holes in the geometry.

See Also

gLength

Examples

	gArea(readWKT("POINT(1 1)"))
	gArea(readWKT("LINESTRING(0 0,1 1,2 2)"))
	gArea(readWKT("LINEARRING(0 0,3 0,3 3,0 3,0 0)"))
	
	
	p1 = readWKT("POLYGON((0 0,3 0,3 3,0 3,0 0))")
	p2 = readWKT("POLYGON((0 0,3 0,3 3,0 3,0 0),(1 1,2 1,2 2,1 2,1 1))")
	
	gArea(p1)
	p1@polygons[[1]]@area
	
	gArea(p2)
	p2@polygons[[1]]@area