This is a technical document describing the step-by-step procedure for pre-tasking of satellites for disaster impact mapping in the frame of the Copernicus Emergency Management Service (CEMS). Pre-tasking is done following alerts for upcoming disasters issued by early warning systems (in this case by the European Flood Awareness System) which are either operated under CEMS or under other frameworks. Disaster impact mapping is performed under Rapid Mapping, the 24/7/365 on-demand service of CEMS. The procedure has been integrated into the standard operating procedures of the Emergency Response Coordination Center of DG ECHO.JRC.E.1-Disaster Risk Managemen