The ocean tide is a dominant process of the ocean circulation dynamics on the continental shelves and in the coastal areas. It shows up as rises and decreases in the sea level once or twice a day, with amplitudes ranging from a few centimeters to several meters, depending on the regions. The currents generated by the displacements of such water masses can reach several m/s locally. It is important to understand the ocean tide process for many coastal applications such as tourism, fisheries, offshore operations and marine energies. It can be well known in some very peculiar regions, thanks to local historical observations, but in most regions of the global ocean, modelling is still the only mean to estimate the ocean tide elevations and velocities. However, the ocean tide process is particularly complex to model because it strongly interacts with the bottom of the ocean, which is still poorly mapped.