Validating satellite data for many missions is an ongoing task to ensure that the satellite data are accurate. This means taking measurements out in the field, either on land, at sea or from the air to compare with data delivered by the satellite in question.
While much work has been done for validating Copernicus Sentinel-3 ocean-colour data in the open ocean, coastal zones present a more complex environment.
Coastal waters are subject to land and river runoff, which leads to suspended sediment and therefore they are more biologically active that waters of the open ocean – and coastal water conditions change all the time.
Sentinel-3 is a two-satellite constellation. Each satellite carries the same suite of instruments to measure Earth’s oceans, land, ice and atmosphere. One of the instruments is the Ocean and Land Colour Instrument which, as its name implies, is used to map changing land cover and to monitor ocean biology and water quality.
Satellite measurements of the water surface are essentially a combination of the solar radiation reflected from the surface and solar radiation, which has been transmitted through the water and then reflected back out. The atmosphere has a large impact on how much of the ...