Name

ST_ConstrainedDelaunayTriangles — Return a constrained Delaunay triangulation around the given input geometry.

Synopsis

geometry ST_ConstrainedDelaunayTriangles(geometry g1);

설명

Return a Constrained Delaunay triangulation around the vertices of the input geometry. Output is a TIN.

This method needs SFCGAL backend.

2.1.0 버전부터 사용할 수 있습니다.

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

예시

ST_ConstrainedDelaunayTriangles of 2 polygons

select ST_ConstrainedDelaunayTriangles(
                                                                ST_Union(
                                                                                                'POLYGON((175 150, 20 40, 50 60, 125 100, 175 150))'::geometry,
                                                                                                ST_Buffer('POINT(110 170)'::geometry, 20)
                                                                                )
                                                );
                                        

ST_DelaunayTriangles of 2 polygons. Triangle edges cross polygon boundaries.

select ST_DelaunayTriangles(
                                                                ST_Union(
                                                                                                'POLYGON((175 150, 20 40, 50 60, 125 100, 175 150))'::geometry,
                                                                                                ST_Buffer('POINT(110 170)'::geometry, 20)
                                                                                )
                        );