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Returns a POINT guaranteed to lie on the surface. ST_PointOnSurface

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Signatures

ST_PointOnSurface(A: Geometry)

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Parameters

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A
Geometry
required
The input geometry.

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Return type

The resulting geometry.

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Example

SELECT ST_AsText(ST_PointOnSurface(ST_GeomFromText('POINT(0 5)')));
 st_astext
------------
 POINT(0 5)

SELECT ST_AsText(ST_PointOnSurface(ST_GeomFromText('LINESTRING(0 5, 0 10)')));
 st_astext
------------
 POINT(0 5)

SELECT ST_AsText(ST_PointOnSurface(ST_GeomFromText('POLYGON((0 0, 0 5, 5 5, 5 0, 0 0))')));
   st_astext
----------------
 POINT(2.5 2.5)

SELECT ST_AsText(ST_PointOnSurface(ST_GeomFromText('LINESTRING(0 5 1, 0 0 1, 0 10 2)')));
   st_astext
----------------
 POINT Z(0 0 1)