ST_Envelope - Amazon Neptune
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ST_Envelope

ST_Envelope returns the minimum bounding box of the input geometry, as follows:

  • If the input geometry is empty, the returned geometry will be POINT EMPTY.

  • If the minimum bounding box of the input geometry degenerates to a point, the returned geometry is a point.

  • If none of the preceding is true, the function returns a counter-clockwise-oriented polygon whose vertices are the corners of the minimum bounding box.

For all nonempty input, the function operates on the 2D projection of the input geometry.

Syntax

ST_Envelope(geom)

Arguments

  • geom - A value of data type GEOMETRY or an expression that evaluates to a GEOMETRY type.

Return type

GEOMETRY

If geom is null, then null is returned.

Examples

RETURN ST_Envelope(ST_GeomFromText("POLYGON ((2 1, 4 3, 6 1, 5 5, 3 4, 2 1))"))
POLYGON ((2 1, 6 1, 6 5, 2 5, 2 1))