Nowadays people from all over the world want to participate in helping people suffering from floods and other natural disasters. Most of their private organisations are communicated and organised via internet.
Mobile information technology devices play an increasing role in responding to natural hazards and humantitarian emergencies. Platforms like crisis mapper are gathering, display and analyse real-time data during a crisis and therefore volunteers integrate social media, crowd sources and geospatial tools into a working network. For example validated tweets, facebook status messages and picutres about blocked streets are connected to georeferenced places and can be displayed on a map (e.g. google maps) which will help to plan the route for action forces.
For more information please visit:
Big data and crowdsourcing in humanitarian crisis mapping
How crisis mapping saved lives in Haitit (National Geographic)
Example: Flood in Halle (Germany); NSW Bushfires (Australia); 2013 Colorado Floods (USA)