The “flat Earth” model is not appropriate when mapping larger areas. It does not take into
account the curvature of the Earth.

A “curved Earth” model more closely represents the shape of the Earth. A spheroid best
represents the shape of the Earth because it is significantly wider at the equator than around the
poles (Unlike a simple sphere). A spheroid, (also known as an ellipsoid) represents the equator as
an elliptical shape, rather than a round circle. Surveying and navigation calculations can he
performed over a large area when a spheroid is used as a curved Earth reference model.