The inventive method for monitoring entities (10) moving in a monitored space represented by a first digital model (14) comprising a set of maps (16) divided into geographical zones (18) of a predetermined shape, and having a size defined according to the level of granularity, includes: identifying geographical zones (18) of each map (16), defining operational zones (24a, 24b) and associating each operational zone (24a, 24b) with a predefined level of granularity, configuration, positioning the entity (10), determining a level of granularity to be applied, determining a geographical zone (18) containing the entity (10), detecting a change of zone, and applying a new level of granularity as a function of the operational destination zone (24a, 24b). The determination steps, the detection step, and the application step are carried out within each entity (10), independently.