This function is used to expand a bounding box to a specified spatial scope.

Syntax

boxndf ST_ExpandSpatial(boxndf box, float8 len);

Parameters

Parameter Description
box The bounding box that you want to expand.
len The length to which you want to expand the bounding box.

Description

This function allows you to expand a bounding box to a specified spatial scope. If the bounding box has the x, y, and z dimensions, the lower bound is decreased by the value of the len parameter, and the upper bound is increased by the value of the len parameter.

Example

Select ST_ExpandSpatial(ST_MakeBox2dt(0,0,'2000-01-02', 20,20, '2000-03-03'), 4);
                      st_expandspatial                       
-------------------------------------------------------------
 BOX2DT(-4 -4 2000-01-02 00:00:00,24 24 2000-03-03 00:00:00)