处理函数
- ST_AddZ
- ST_Buffer
- ST_BuildArea
- ST_ClipByBox2D
- ST_Collect
- ST_ConcaveHull
- ST_ConvexHull
- ST_CurveToLine
- ST_DelaunayTriangles
- ST_Different
- ST_Dump
- ST_DumpPoints
- ST_DumpRings
- ST_FlipCoordinates
- ST_GeneratePoints
- ST_Intersection
- ST_LineToCurve
- ST_MakeValid
- ST_MemUnion
- ST_MinimumBoundingCircle
- ST_MinimumBoundingRadius
- ST_OrientedEnvelope
- ST_Polygonize
- ST_OffsetCurve
- ST_RemoveRepeatedPoints
- ST_SharedPaths
- ST_ShiftLongitude
- ST_Simplify
- ST_SimplifyPreserveTopology
- ST_SimplifyVW
- ST_ChaikinSmoothing
- ST_FilterByM
- ST_SetEffectiveArea
- ST_Split
- ST_SymDifference
- ST_Subdivide
- ST_SwapOrdinates
- ST_Union
- ST_UnaryUnion
- ST_VoronoiLines
- ST_VoronoiPolygons