GMSGeometryArea

extern double GMSGeometryArea(GMSPath *_Nonnull path)

Returns the area of a geodesic polygon defined by path on Earth.

The “inside” of the polygon is defined as not containing the South pole.

If path is not closed, it is implicitly treated as a closed path nevertheless and the result is the same.

All coordinates of the path must be valid.

The polygon must be simple (not self-overlapping) and may be concave.

If any segment of the path is a pair of antipodal points, the result is undefined – because two antipodal points do not form a unique great circle segment on the sphere.