Abstract: The paper presents the description of work activities which have already been done within the first two stages – WorkPackage 1 and WorkPackage 2 - of the GeoSPAR Project. In such a context the general conceptual design of the GIS system and associate web service was presented and analysed. In addition, the operational and technical requirements for the GeoSPAR system have been specified and discussed; with special emphasis on system applications, including both the detection and monitoring of hazardous events along with their simulation and possible outcomes. In particular, the requirements and specification with reference to various sensors and data sources were formulated, these include: airborne data sources, remote sensing satellite data sources and ground-based data sources.