The increasing number of mass events poses new challenges for civil safety management. The aim of the project MONITOR is to combine airborne and terrestrial acquisition systems and also multi-sensor networks to construct a comprehensive overview of the situation. The envisioned developments enable near real-time observation of human motion patterns and short term prediction for early detection of critical situations such as excessive human densities, spatial bottlenecks, or starting turbulences on a mass event. This information supports necessary safety or even evacuation actions. In addition all measured and analyzed data is archived in a geospatial database for documentation purposes as well as for debriefing and analysis after the event.