Extensions
Scalar Functions
Compute the area of a geometry.  
Returns `0.0` for any geometry that is not a `POLYGON`, `MULTIPOLYGON` or `GEOMETRYCOLLECTION` containing polygon geometries.
The area is in the same units as the spatial reference system of the geometry.  
The `POINT_2D` and `LINESTRING_2D` overloads of this function always return `0.0` but are included for completeness.