Return the area of a cell on the sphere, in square metres. The static form takes a single quadbin; the temporal form returns the area of each cell in a trajectory as a tfloat. Cell area shrinks toward the poles, as web-mercator squares cover progressively less ground at higher latitudes.

quadbinCellArea(quadbin) → float8

tquadbinCellArea(tquadbin) → tfloat

SELECT round(quadbinCellArea(quadbin '480fffffffffffff')::numeric, 0);
-- 508164135963886
SELECT round(quadbinCellArea(quadbin '48427fffffffffff')::numeric, 0);
-- 2726563416104