The disclosed observation method involves: - a step of calculating first predicted observation data (46) for a first region of interest (50, 51, 64) according to second observation data (18) acquired by a second observation satellite (8), which has a stationary orbit, for the first region of interest (50, 51, 64) and/or according to first observation data (16) acquired by the first observation satellite (6) for first observation regions (10) located near the first region of interest (50, 51, 64), and according to reference observation data previously stored in a database; and/or - a step of calculating second predicted observation data (48) for a second region of interest (55) according to first observation data (16) acquired by the first observation satellite (6), which has a drifting orbit, and according to reference observation data (40).
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