Then the altimeter bias was evaluated at four crossover
points between Envisat tracks. The crossover points
between the tracks 887 and 130 (P887/130), as well as
429 and 130 (P429/130), are in the configuration of the
point A in Fig. 1 and the SSH are transferred to the calibration
site along the track 130. Concerning the crossover
point between the tracks 674 and 887 (P674/887), the configuration
is the same as the point B in Fig. 1 and the transfer
is done via the point P887/130. Finally, two estimations
are performed at the crossover point between the tracks
674 and 429, following two different paths. The first solution
(P429/674) follows the track 674 up to the point
P674/887 and then along the tracks 887 and 130. For the
second one (P674/429), the SSH is transferred along the
track 429 up to the point P429/130 and then to the calibration
site via the track 130.