A Transformation can be defined as an mathematical operation which transforms some values into other values using a specified function. In geographic terms this means, that some incoming coordinate in a specified crs, must be transformed into a coordinate valid for some other crs. In general two different transformations can be distinguished:
  1. The helmert transformation allows coordinate transformation with a datum shift by going to euclidean space and normalizing to WGS84
  2. Polynomial transformations use a polynomial to approximate a function which directly transforms coordinates from one crs into another.
To accommodate these transformation the deegree crs package defines different transformation packages:

The TransformFactory tries to create the appropriate transformation(s) to maps coordinates from one coordinate systems into another.

@author Rutger Bezema @author last edited by: $Author: rbezema $ @version $Revision: 11234 $, $Date: 2007-03-20 10:15:15 +0100 (Di, 20 Mrz 2007)$