Name

ST_RemovePoint — Remove a point from a linestring.

Synopsis

geometry ST_RemovePoint(geometry linestring, integer offset);

Description

Removes a point from a LineString, given its index (0-based). Useful for turning a closed line (ring) into an open linestring.

Availability: 1.1.0

This function supports 3d and will not drop the z-index.

Examples

Guarantees no lines are closed by removing the end point of closed lines (rings). Assumes geom is of type LINESTRING

UPDATE sometable
	SET geom = ST_RemovePoint(geom, ST_NPoints(geom) - 1)
	FROM sometable
	WHERE ST_IsClosed(geom);

See Also

ST_AddPoint, ST_NPoints, ST_NumPoints