PPT Slide

• A map projection is a mathematical transformation from a

three dimensional ellipsoidal or spherical ERM surface onto

a two dimensional plane.

Map Projections associate points on the

surface of an ERM with points on an X-Y plane

• Since spheres and ellipsoids are not developable, distortions must occur.

• Note that the transformation is from three to two dimensions and

there is no vertical axis in the plane.