— This paper shows how GIS could be used to support decision making in emergency risk management. Paper describes GinisEmergency tool, which is based on existing semantic interoperability platform called GeoNis. The proposed prototype is intended to function as an intelligent, computer-based consultant in assisting diagnostic and decision making processes in potentially hazardous situations. Intelligent integration of heterogeneous data sources based on semantics (represented by ontologies) is important part of this research.