Altimeter satellite gridded Sea Level Anomalies (SLA) were computed with respect to a twenty-year mean, processed by the DUACS multimission altimeter data processing system, incorporating data from all altimeter missions: Jason-3, Sentinel-3A, HY-2A, Saral/AltiKa, Cryosat-2, Jason-2, Jason-1, T/P, ENVISAT, GFO, ERS1/2. All the missions are homogenized with respect to a reference mission OSTM/Jason-2. The SLA is computed with an optimal and centered computation time window (6 weeks before and after the date). Resolution is 0.25 X 0.25 degrees and has an irregular temporal resolution, although they are distributed on a daily basis. This dataset can be downloaded from the Copernicus Marine Environment Monitoring Service (CMEMS):
https://resources.marine.copernicus.eu/? option=com_csw&task=results&product_id=SEALEVEL_GLO_PHY_L4_REP_OBSERVATIONS_008_047&view=details