rgeos (version 0.5-3)

gIsEmpty: Is Geometry Empty?

Description

Tests if the given geometry is empty

Usage

gIsEmpty(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

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

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

# NOT RUN {
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))"))
# }