Package org.deegree.crs.transformations

A Transformation can be defined as an mathematical operation which transforms some values into other values using a specified function.

See:
Description

Class Summary

Transformation	The Transformation class supplies the most basic method interface for any given transformation.
TransformationFactory	The TransformationFactory class is the central access point for all transformations between different crs's.

Package org.deegree.crs.transformations Description

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:

• coordinate, which defines classes for chaining transformations (e.g. transformation steps). The resulting concatenated transformation will define a function which transforms coordinates between two different coordinate systems
• helmert, which transforms coordinates from one euclidean R^3 space into another
• polynomial, which transforms coordinates direct between two different coordinate system using a polynomial function

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

Version:

$Revision: 11234 $, $Date: 2007-03-20 10:15:15 +0100 (Di, 20 Mrz 2007)$

Author:

Rutger Bezema, last edited by: $Author: rbezema $