ST_ZMin method for type ST_Geometry

ST_ZMin method for type ST_Geometry

Retrieves the minimum Z coordinate value of a geometry.

Syntax

geometry-expression.ST_ZMin()

Returns

Remarks

Returns the minimum Z coordinate value of the geometry-expression. This is computed by comparing the Z attribute of all points in the geometry.

Note

If the geometry-expression is an empty geometry (ST_IsEmpty()=1), then this method returns NULL.

Note

By default, ST_ZMin uses the original format for a geometry, if it is available. Otherwise, the internal format is used. For more information about internal and original formats, see STORAGE FORMAT clause, CREATE SPATIAL REFERENCE SYSTEM statement.

See also

Standards and compatibility

Example

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