PostGIS

ST_ConstrainedDelaunayTriangles
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ST_ConstrainedDelaunayTriangles

7.21. SFCGAL Functions

Name

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

Synopsis

geometry +`*`+ST_ConstrainedDelaunayTriangles*(`geometry `g1`)`;

Description

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

check This method needs SFCGAL backend.

Availability: 3.0.0

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

Examples

st_constraineddelaunaytriangles01

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_constraineddelaunaytriangles02

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)
                   )
       );

PostGIS

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Synopsis

Description

Examples

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