In this paper, the diffusion of WNS and GSN into the management of disasters (natural and manmade) is briefly reviewed, since such networks are capable to offer their services to every phase of DRMC. For any kind of disaster, there is a five-phases life-cycle (i.e., response, recovery, mitigation, prevention, preparedness) known as Emergency Management and Disaster (Crisis) Risk Management Cycle (DRMC). WSN or GSN are by some means dedicated instruments which are capable to sample space-time processes and generate lots of real-time data that perfectly satisfies this urgent demand of up-to-date information (even support the frequent update of information for reacting promptly against crisis). The management of disasters demands competent decision support which, in its turn, asks for up-to-date information. densely deployment, dense sensing of the environment, large spatial coverage, robustness, no human intervention etc. In general, disaster monitoring, management and environmental observation are indisputably a wide and fertile field with enormous potential related with the advantages of network features such as e.g. The plethora of possibilities concerning applications of wireless sensor networks (WSN) and/or geosensor networks (GSN), which are a revolution in the physical world observation, forms a disruptive technology very beneficial for many (and different) fields and applications. This established fact, in relation with the axiom that " disasters will always happen ", arguably is producing a numerous and extremely complex set of problems (social, environmental, economic and technical). There is a pretty large variety of all kinds of disasters (either natural or manmade).
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