This computation involves the Level 1 processing algorithm applied to raw Ocean and Land Colour Instrument (OLCI) data. This product consists of the physical measurements from the instrument. These are Top Of Atmosphere (TOA) radiances, calibrated to geophysical units (W.m-2. sr-1 µm-1), georeferenced onto the Earth's surface, spatially resampled onto an evenly spaced grid, and annotated with illumination and observation geometry, environment data (meteorological data) and quality and classification flags.
The product is available at two spatial resolutions: full resolution and reduced resolution.

The processing involves the following steps:

1. Data extraction and quality checks.
2. Radiometric scaling.
3. Stray light correction.
4. Georeferencing.
5. Pixel classification functions.
6. Spatial re-sampling.
7. Product formatting (into the two spatial resolutions)

For more information please see the OLCI user guide in the docs tab.