SUMMARY
The ocean surface must be surveyed in order to determine the dynamic topography, tides, time-variations etc…The Mean Ocean Dynamic Topography (MDT), which is the distance between the Geoid and the Mean Sea Surface Height (MSS) and which reflects the ocean dynamics, is a primary oceanography unknown.The processing of 21 years altimetry satellite measurements by the correction of the environmental, geophysical and orbital effects, permit us to determinate the mean sea surface height with 1 cm of precision, while using a Geoid model based on 03 years of GOCE satellite measurements, we can calculate the Mean Dynamic Topography over the Western Mediterranean sea. The variation of the obtained surface is between -0.75 and 0.75m.The obtained surface is compared with RioMed which the Mean dynamic topography over the Mediterranean Sea provided by AVISO Altimetry (CNES).