The algorithm described in Annex D is used for the conversion between (line,pixel) coordinates to the corresponding point P on an ellipsoid. (The Doppler, range and ellipsoid equation.) This step consists of three steps basically.

- For the center (line,pixel) of the master image, compute the position (x,y,z in system of the orbits) of the point P on an ellipsoid.
- Based on the Doppler equation, compute the position of the slave satellite, corresponding to the point P on an ellipsoid, and compute the (line,pixel) coordinates in the slave system.
- The difference (slave-master) between the (line,pixel)
coordinates is defined as the offset.

Leijen 2009-04-14