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The Sentinel-3 satellites carry five main instruments particularly suitable for water monitoring: The Ocean and Land Colour Instrument (OLCI), Sea and Land Surface Temperature Radiometer (SLSTR), SAR Radar Altimeter (SRAL), MicroWave Radiometer (MWR) and Precise Orbit Determination (POD) instruments.

Data from the Sentinel-3 mission is applied in the fields of climate change analysis, ocean forecasting and pollution monitoring.