class PointOnSurface(expression, **extra)  
Availability: PostGIS, Oracle, SpatiaLite
Accepts a single geographic field or expression and returns a Point geometry guaranteed to lie on the surface of the field; otherwise returns None.
class PointOnSurface(expression, **extra)  
Availability: PostGIS, Oracle, SpatiaLite
Accepts a single geographic field or expression and returns a Point geometry guaranteed to lie on the surface of the field; otherwise returns None.
 
          
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