The area function returns the area of a
spherical object in square radians. Supported data types are:
scircle, spolygon (if the polygon
is convex), sbox, and smoc.
Example 6.1. Area of a spherical circle as a multiple of π
sql> SELECT area( scircle '<(0d,90d),60d>' ) / pi() AS area;
area
------
1
(1 row)
sql> SELECT area(smoc '0/1-3');
area
-------------------
3.141592653589793
(1 row)