ACRITAS aimed at the research, design, development and validation of space-based integrated applications for surveillance and monitoring through advanced multi-sensor data fusion technologies. Special emphasis is put on the integrated use of space-related technologies (i.e., Earth Observation (GMES), Satellite Communications (SatCom), and Satellite Navigation (GNSS)), and their fusion with available terrestrial in-situ assets for key application domains, such as: Border Surveillance, Critical Energy Infrastructure Monitoring, Coastal Environmental Monitoring, and Agricultural Monitoring.