ST_patchMin

Computes the minimum value of each attribute dimension across all pcpoint objects in a pcpatch object, and returns a new pcpoint object with each dimension set to the corresponding minimum.

numeric ST_patchMin(pcpatch pc);

SELECT ST_AsText(ST_PatchMin(pa)) FROM patches WHERE id = 7;

{"pcid":1,"pt":[-126.5,45.5,50,5]}