Description Usage Arguments Value Author(s) See Also Examples

Calculates the area of the given geometry.

1 |

`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) |

Returns the area of the geometry in the units of the current projection. By definition non-[MULTI]POLYGON geometries have an area of 0. The area of a POLYGON is the area of its shell less the area of any holes. Note that this value may be different from the `area`

slot of the `Polygons`

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

Roger Bivand & Colin Rundel

1 2 3 4 5 6 7 8 9 10 11 12 13 | ```
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
``` |

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