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The following operator functions are available:

Function Description
ST_Buffer Compute a buffer around a Geometry
ST_ConvexHull Compute the smallest convex POLYGON that contains all the points in the Geometry
ST_Difference Compute the difference between two geometries
ST_Intersection Compute the intersection of two Geometries
ST_SymDifference Compute the symmetric difference between two Geometries
ST_Union Compute the union of two or more Geometries