Official HYGEOS website


Polymer is an algorithm aimed at recovering the radiance scattered and absorbed by the oceanic waters (also called Ocean Colour) from the signal measured by satellite sensors in the visible spectrum. It has been applied to multiple sensors from ESA (MERIS/ENVISAT), NASA (SeaWiFS, MODIS/Aqua, VIIRS), and the Korean Geostationary Ocean Colour Imager (GOCI).

The Polymer algorithm is being used operationally by CLS since 2008 in the CatSat service.

It has been selected to process MERIS and MODIS data in the frame of the Ocean Colour Climate Change Initiative. It has also been used for several projects for the European Space Agency (ESA) and the French Space Agency (CNES).

It is described in the following paper: Atmospheric correction in presence of sun glint: application to MERIS (2011)



 Observation of the ocean from space by MERIS

(Mediterranean Sea, may 1st, 2005)

The right part of the image is affected by sun glint, the bright reflection of the sun by the sea surface.


Chlorophyll concentration in log10(mg/m3)

(after processing by Polymer)

The ocean colour information is retrieved even in the sun glint area.


 One of the strengths of this algorithm is the possibility to recover the Ocean Colour in presence of sun glint. This leads to a much improved spatial coverage compared to previous products.