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Returns a point that is guaranteed to be on a surface in the multi-surface
If the multi-surface is the empty set, returns NULL.
Otherwise, returns an ST_Point value guaranteed to spatially intersect the ST_MultiSurface value.
The spatial reference system identifier of the result is the same as the spatial reference system of the multisurface-expression.
Returns a point that is in the interior of one of the surfaces of a multi-surface.
If the multisurface-expression contains circular strings, then these are interpolated to line strings.
SQL/MM (ISO/IEC 13249-3: 2006)