rgeos (version 0.6-4)

gIsEmpty: Is Geometry Empty?

Description

Tests if the given geometry is empty

Usage

gIsEmpty(spgeom, byid = FALSE)

Value

Returns TRUE if the given geometry is empty, FALSE otherwise.

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)

Author

Roger Bivand & Colin Rundel

Details

Because no sp Spatial object may be empty, the function exists but cannot work, as readWKT is not permitted to create an empty object.

See Also

gIsRing gIsSimple gIsValid

Examples

try(gIsEmpty(readWKT("POINT EMPTY")))
gIsEmpty(readWKT("POINT(1 1)"))
try(gIsEmpty(readWKT("LINESTRING EMPTY")))
gIsEmpty(readWKT("LINESTRING(0 0,1 1)"))
try(gIsEmpty(readWKT("POLYGON EMPTY")))
gIsEmpty(readWKT("POLYGON((0 0,1 0,1 1,0 1,0 0))"))