Because of this and because of the fact, the earth isn't a perfect sphereoid --or even a perfect ellipsoid for that matter--, there is no 'best' projection for the projection of every region on earth. Hence a lot of different mathematical projectional functions have been developed over the years. It is possible to categorise these functions into three groups:
@author Rutger Bezema @author last edited by: $Author: rbezema $ @version $Revision: 6259 $, $Date: 2007-03-20 10:15:15 +0100 (Di, 20 Mrz 2007)$