Calibration enables the calculation of the actual radiance of the Earth target, from the corresponding digital counts produced by the satellite instrument.

Different calibration methods (temperature/radiance tables) have been used for the Meteosat satellite series to convert the radiances into brightness temperatures. Quantitative application of satellite observations requires the calibration of their raw data.

Different methods have been used to calibrate the instruments of the Meteosat satellite series to convert the observed digital counts into radiances.

To convert these radiances to brightness temperature or reflectance requires further information on the instruments' characterisation.

Details on these calibration and conversion processes are given in the pages linked below.

MFG Calibration — information relevant to the Meteosat First Generation programme, including IR/WV channel calibration methods, coefficients and historial calibration details.

MSG Calibration — information relevant to the Meteosat Second Generation programme, including SEVIRI solar channel coefficients, pre- and post-launch calibration details.

Inter-calibration — by using inter-calibration methods a reference instrument, with well-known calibration characteristics, is compared with collocated observations from another instrument, to derive calibration corrections for the latter, helping ensure consistency between the products of the different instruments.