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Return the topological dimension of this Geometry object, which must be less than or equal to the coordinate dimension. OGC SPEC s2.1.1.1 - returns 0 for POINT, 1 for LINESTRING, 2 for POLYGON, and the largest dimension of the components of a GEOMETRYCOLLECTION. If the dimension is unknown (e.g. for an empty GEOMETRYCOLLECTION) 0 is returned. ST_Dimension

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Signatures

ST_Dimension (A: Geometry) | ST_Dimension (C: Geometrycollection)

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Parameters

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A
Geometry
required
The input geometry.

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Return type

An integer value.

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Example

SELECT ST_Dimension('GEOMETRYCOLLECTION(LINESTRING(1 1,0 0),POINT(0 0))');

1