关系函数
- ST_3DClosestPoint
 - ST_3DDistance
 - ST_3DDWithin
 - ST_3DDFullyWithin
 - ST_3DIntersects
 - ST_3DLongestLine
 - ST_3DMaxDistance
 - ST_3DShortestLine
 - ST_Area
 - ST_Azimuth
 - ST_Angle
 - ST_Centroid
 - ST_ClosestPoint
 - ST_Contains
 - ST_ContainsProperly
 - ST_Covers
 - ST_CoveredBy
 - ST_Crosses
 - ST_LineCrossingDirection
 - ST_Disjoint
 - ST_Distance
 - ST_MinimumClearance
 - ST_MinimumClearanceLine
 - ST_HausdorffDistance
 - ST_FrechetDistance
 - ST_MaxDistance
 - ST_DistanceSphere
 - ST_DistanceSpheroid
 - ST_DFullyWithin
 - ST_DWithin
 - ST_Equals
 - ST_GeometricMedian
 - ST_HasArc
 - ST_Intersects
 - ST_Length
 - ST_Length2D
 - ST_3DLength
 - ST_LengthSpheroid
 - ST_Length2DSpheroid
 - ST_LongestLine
 - ST_OrderingEquals
 - ST_Overlaps
 - ST_Perimeter
 - ST_Perimeter2D
 - ST_3DPerimeter
 - ST_PointOnSurface
 - ST_Project
 - ST_Relate
 - ST_RelateMatch
 - ST_ShortestLine
 - ST_Touches
 - ST_Within