説明

Returns a copy of the input LINESTRING, CIRCULARLINESTRING, or NURBSCURVE geometry with the M coordinate of the last point set to the specified value. If the input geometry does not have an M dimension, it will be added. Returns NULL if the input is not a LINESTRING, CIRCULARLINESTRING, or NURBSCURVE.

このメソッドは曲線ストリングと曲線に対応しています。

例

Set end M value of a LineString

SELECT ST_AsText(ST_SetEndM('LINESTRING M(0 0 10, 1 1 20, 2 0 30)'::geometry, 999));
        st_astext
------------------------
 LINESTRING M (0 0 10,1 1 20,2 0 999)

Add M dimension and set end M value

SELECT ST_AsText(ST_SetEndM('LINESTRING(0 0, 1 1, 2 0)'::geometry, 75));
        st_astext
------------------------
 LINESTRING M (0 0 0,1 1 0,2 0 75)

Set end M value of a CircularString

SELECT ST_AsText(ST_SetEndM('CIRCULARSTRING M(0 0 5, 1 1 10, 2 0 15)'::geometry, 88));
        st_astext
------------------------
 CIRCULARSTRING M (0 0 5,1 1 10,2 0 88)

Set end M value of a NURBSCurve

SELECT ST_AsText(ST_SetEndM('NURBSCURVE M(2, (0 0 100, 1 1 200, 2 0 300))'::geometry, 999));
        st_astext
------------------------
 NURBSCURVE M (2,(0 0 100,1 1 200,2 0 999))

関連情報

ST_SetStartM, ST_EndM, ST_EndPoint