pred-unary-gIsEmpty: Is Geometry Empty?

Description Usage Arguments Details Value Author(s) See Also Examples

Description

Tests if the given geometry is empty

Usage

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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)

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.

Value

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

Author(s)

Roger Bivand & Colin Rundel

See Also

gIsRing gIsSimple gIsValid

Examples

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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))"))

rgeos documentation built on Nov. 17, 2017, 4:28 a.m.