Assertion: ellipsoid's surface | /r/HasProperty | mathematical
Facets:
Source sentences:
text: On land, the reference ellipsoid forms the mathematical surface that would be taken by sea level if the land areas were crisscrossed by canals.
text: As a result, the “pear-shaped” sphere or the triaxial ellipsoid is a mathematical surface that is an approximation to the true shape of the Earth.