ST_BoundingDiagonal

Description

Returns the diagonal of the supplied geometry's bounding box as linestring. If the input geometry is empty, the diagonal line is also empty, otherwise it is a 2-points linestring with minimum values of each dimension in its start point and maximum values in its end point.

The returned linestring geometry always retains SRID and dimensionality (Z and M presence) of the input geometry.

The fits parameter specifies if the best fit is needed. If false, the diagonal of a somewhat larger bounding box can be accepted (is faster to obtain for geometries with a lot of vertices). In any case the bounding box of the returned diagonal line always covers the input geometry.

	In degenerate cases (a single vertex in input) the returned linestring will be topologically invalid (no interior). This does not make the return semantically invalid.

Availability: 2.2.0

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

This function supports M coordinates.

Examples

-- Get the minimum X in a buffer around a point
SELECT ST_X(ST_StartPoint(ST_BoundingDiagonal(
  ST_Buffer(ST_MakePoint(0,0),10)
)));
 st_x
------
  -10
		

See Also

ST_StartPoint , ST_EndPoint , ST_X , ST_Y , ST_Z , ST_M , &&&