Is Geometry Empty?
Tests if the given geometry is empty
gIsEmpty(spgeom, byid = FALSE)
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) |
Because no sp Spatial object may be empty, the function exists but cannot work, as readWKT is not permitted to create an empty object.
Returns TRUE if the given geometry is empty, FALSE otherwise.
Roger Bivand & Colin Rundel
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))"))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.