*4.2. Dominant Wave Direction and Significant Wave Height*

These variables can be measured with radar altimeters and SAR. In the time frame 2020–2030, the instruments capable of measuring these variables are Poseidon-4 (Sentinel-6/JASON), SRAL (Sentinel-3) and SAR-C (Sentinel-1), but the 3-h revisit time is not satisfied. The current Copernicus infrastructure delivers about 24–48 h of latency for the corresponding measurements.
