ST_MinimumClearanceLine — Returns the two-point LineString spanning a geometry's minimum clearance.
Geometry ST_MinimumClearanceLine(geometry g);
Returns the two-point LineString spanning a geometry's minimum clearance. If the geometry does not have a minimum clearance, LINESTRING EMPTY is returned.
Realizado por el módulo GEOS.
Availability: 2.3.0 - requires GEOS >= 3.6.0
SELECT ST_AsText(ST_MinimumClearanceLine('POLYGON ((0 0, 1 0, 1 1, 0.5 3.2e-4, 0 0))'));
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LINESTRING(0.5 0.00032,0.5 0)