ST_Area method for type ST

multisurface-expression.ST_Area([ unit-name])

Name	Type	Description
unit-name	VARCHAR(128)	The units in which the area should be computed. Defaults to the unit of the spatial reference system. The unit name must match the UNIT_NAME column of a row in the ST_UNITS_OF_MEASURE view where UNIT_TYPE is 'LINEAR'.

Computes the area of the multi-surface in the specified units. The area of the multi-surface is the sum of the areas of the contained surfaces.

This method can not be used with geometries in round-Earth spatial reference system.