PostGIS
Description
The <<| operator returns TRUE if the bounding box of geometry A
is strictly below the bounding box of geometry B.
|
Examples
SELECT tbl1.column1, tbl2.column1, tbl1.column2 <<| tbl2.column2 AS below
FROM
( VALUES
(1, 'LINESTRING (0 0, 4 3)'::geometry)) AS tbl1,
( VALUES
(2, 'LINESTRING (1 4, 1 7)'::geometry),
(3, 'LINESTRING (6 1, 6 5)'::geometry),
(4, 'LINESTRING (2 3, 5 6)'::geometry)) AS tbl2;
column1 | column1 | below
---------+---------+-------
1 | 2 | t
1 | 3 | f
1 | 4 | f
(3 rows)