The ST_Surface type is a supertype for 2-dimensional geometry types. The ST_Surface type is not instantiable.
Methods of ST_Surface:
All methods of ST_Geometry type can also be called on a ST_Surface type:
SQL/MM (ISO/IEC 13249-3: 2006) 8.1
ST_Area method
ST_Centroid method
ST_IsWorld method
ST_Perimeter method
ST_PointOnSurface method
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