What we do

Physics of measurement and radiometry are based on simulation and modelling of the signal in the atmosphere from low Earth orbit satellites.


The activity consists in correcting the satellite data in order to provide users with products that are not disturbed by the atmosphere (clouds, for example, can disrupt these data). The team monitors the radiometric calibration of the sensors and then modifies these defective sensors to ensure that the measurements are accurate.

We are providing processing chains to achieve more sophisticated products. Finally, we are developing advanced studies of various nature.

sensor and radiometry magellium

We correct the data to make the measurements more accurate.

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Our Expertise

Image satellite analysis

Development of processing chains

Key projects

We take part in many sensor and radiometry projects. Some major ones are listed here :

Image Quality for CNES

Studies of L1 data processing modules for optical sensors (Venµs, Taranis, MicroCarb, MERLIN, etc) are performed in support to CNES  before and during commissioning phase. The activities cover performance studies and validation.


The Earth Observation team is developing the level 2 (L2) processing for the ESA FLEX mission: radiometric and spectral calibration, geometric co-registration, atmospheric , cloud detection, atmospheric correction, fluorescence retrieval, biophysical parameters retrieval, ortho-rectification. The project has setcharacterisation up a European scientific collaboration and will end up with an operational prototype for ESA.

Learn more here.

RadCalNet for ESA

The unit is responsible for the development, maintenance and updates of the RadCalNet portal. Since March 2013, it provides visualisation and download capabilities on the data acquired by the four RadCalNet instrumented reference test sites. There are 287 users who are either representatives of national space agencies (NASA, EUMETSAT, CONIDA (Peru), CSIRO (Australia), SANSA (South Africa), S2 MPC, etc.) or private operators of optical space sensors (Airbus, Leonardo, Planet labs, Surrey Satellite Technology Ltd, etc.)

The 4 test sites provide top-of-atmosphere reflectance in nadir-view at 30 minutes intervals from 9:00 am to 3:00 pm local standard time, from 400 nm to 2500 nm.

Learn more here.

sensor radiometry calibration
esa cnes dga airbus thales earth observation
european space agency esa
direction generale armees dga
french government
ads airbus defense and space
centre nationale etudes spatiales cnes
tas thales aenia space

Learn more about our other offers :

earth observation


The Earth Observation Unit of Magellium  is an expert in optical space missions and geophysical and biophysical applications. The EO unit provides high level of expertise and full capacity on the whole processing chain, enabling it to respond to all projects from the greatest space orders such as ESA and CNES.



+33 5 62 24 70 00

1, rue Ariane
31520 Ramonville Saint-Agne FRANCE

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