The precise determination of the satellite and in situ
instantaneous sea surface heights (SSHalti
B;tr3 and
SSHgauge
TG;tr1ðtÞ);
- Stable mean SSH profiles at the various crossover
points, which implies that many altimeter cycles are
available (SSHalti);
- A high-quality in situ mean sea surface, to link the satellite
data to the coastal in situ data (SSHinsitu
TG;tr1 SSHinsitu
C;tr1 );
- A good estimate of the ocean dynamics at the considered
altimetry crossover point as well as at the calibration
site (dynB;tr3 and dynTG;tr1).