PG_FUNCTION_INFO_V1() [13/23]

PG_FUNCTION_INFO_V1

(

LWGEOM_isclosed

)

IsClosed(GEOMETRY) if geometry is a linestring then returns startpoint == endpoint.

If its not a linestring then return NULL. If it's a collection containing multiple linestrings,

Returns

true only if all the linestrings have startpoint=endpoint.