The subject of the invention is computer systems (100) for acquiring satellite images. The invention also comprises devices (120) for computing satellite mission plans, and Earth-observation satellites (110). The general principle of the invention is based on the observation that uncertainty related to meteorological conditions may lead to the generation of satellite mission plans the performance of which is poor. Thus, the invention proposes to characterize this uncertainty and to use it to improve the generation of satellite mission plans. In the invention, a model of the uncertainties is constructed on the basis of past meteorological observations and/or predictions. Next, when the plan is generated, the model is exploited, current observations and/or predictions being input into the model to this end. In this way, it is possible to identify acquisition regions in which it is more probable that acceptable images will be acquired at the desired acquisition date.
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