설명

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

1.1.0 버전부터 사용할 수 있습니다.

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

예시

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);

참고

ST_AddPoint, ST_NPoints, ST_NumPoints