Sentinel-3C ocean color satellite entered orbit in September 2026, while EUMETSAT's Collection-4 upgrade replaces a 1990s atmospheric correction algorithm that has long degraded coastal chlorophyll data. The new OC-SAC module uses SWIR bands from Sentinel-3's paired instruments to improve retrievals in turbid coastal waters, where standard near-infrared correction fails.
Sentinel-3C in Orbit: EUMETSAT's New Algorithm Fixes Decades of Coastal Ocean Color Errors
