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Applies to: 
Databricks Runtime 17.1 and above
Important
This feature is in Public Preview.
Returns the area of the input GEOGRAPHY or GEOMETRY value.
Syntax
st_area ( geoExpr )
Arguments
geoExpr: AGEOGRAPHYorGEOMETRYvalue.
Returns
A value of type DOUBLE, representing the area of the input GEOGRAPHY or GEOMETRY value.
If the input is a GEOGRAPHY value, the function returns the 2D geodesic area of the of the GEOGRAPHY value.
Specifically, the function returns the geodesic area for polygons, and the sum of the areas of the polygons in a multipolygons.
For non-areal geographies (points, linestrings, multipoints, and multilinestrings) 0 is returned, whereas for geometry collections the function returns the sum of the areas of the elements in the collection.
The result is computed by performing the inverse geodesic calculation assuming the WGS84 ellipsoid.
The units of the result is square meters.
If the input is a GEOMETRY value, the function returns the 2D Cartesian area of the GEOMETRY value.
Specifically, the function returns the 2D Cartesian area for polygons, and the sum of the areas of the polygons in a
multipolygon.
For non-areal geometries (points, linestrings, multipoints, and multilinestrings) 0 is returned, whereas for geometry collections it returns the sum of the areas of the elements in the collection.
The units of the result are those of the spatial reference system of the input GEOMETRY value, squared.
The function returns NULL if any of the inputs is NULL.
Examples
-- Returns the area of a 2D Cartesian polygon with a hole.
> SELECT st_area(st_geomfromtext('POLYGON((0 0,50 0,50 50,0 50,0 0),(20 20,25 30,30 20,20 20))'))
2450.0