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ST_RemovePoint

ST_RemovePoint
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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.

Enhanced: 3.2.0

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);