Assertion: spheroid's surface | /r/HasProperty | projected to flat surface
Facets:
value: to generate the map
type: PURPOSE
value: secondly
type: MANNER
Source sentences:
text: Projection consists of two main stages: first the surface of the earth is estimated through the use of a geometric description called an ellipsoid (sometimes, though not always correctly, referred to as a spheroid), and secondly the surface of this ellipsoid is projected on to a flat surface to generate the map.