“…The latter are conceived as plug-ins into the common infrastructure provided by the mission-generic components. 1 CEOS is the "Committee on Earth Observation Satellites" Nowadays constellation represents an emerging concept for EO, in which sensing capabilities and orbital characteristics of a group of satellite are correlated such to provide global operational performances. Indeed a spacecraft constellation can significantly shorten revisit time of sites and imaging data latencies, providing performance levels not reachable by a single satellite even though large sized and hosting technologically advanced observation sensors, and specially allow a staggered deployment, scaling the reachable performance and a graceful degradation, along with the number of satellites deployed.…”