Name
ST_Force3DZ — 도형을 XYZ 모드로 강제합니다.
Synopsis
geometry ST_Force3DZ(geometry geomA, float Zvalue = 0.0);
설명
Forces the geometries into XYZ mode. If a geometry has no Z component, then a Zvalue Z coordinate is tacked on.
개선 사항: 2.0.0 버전부터 다면체 표면(polyhedral surface)을 지원합니다.
변경 사항: 2.1.0 미만 버전, 즉 2.0.x 버전까지 이 함수의 명칭은 ST_Force_3DZ였습니다.
Changed: 3.1.0. Added support for supplying a non-zero Z value.
This function supports Polyhedral surfaces.
This function supports 3d and will not drop the z-index.
This method supports Circular Strings and Curves.
예시
--Nothing happens to an already 3D geometry
SELECT ST_AsEWKT(ST_Force3DZ(ST_GeomFromEWKT('CIRCULARSTRING(1 1 2, 2 3 2, 4 5 2, 6 7 2, 5 6 2)')));
st_asewkt
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CIRCULARSTRING(1 1 2,2 3 2,4 5 2,6 7 2,5 6 2)
SELECT ST_AsEWKT(ST_Force3DZ('POLYGON((0 0,0 5,5 0,0 0),(1 1,3 1,1 3,1 1))'));
st_asewkt
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POLYGON((0 0 0,0 5 0,5 0 0,0 0 0),(1 1 0,3 1 0,1 3 0,1 1 0))