PostGIS

ST_RemovePoint
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ST_RemovePoint

7.5. Geometry Editors

Name

ST_RemovePoint — Remove a point from a linestring.

+geometry +ST_RemovePoint(+`geometry `+linestring, integer offset`)`;

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

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

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);