Concepts and Applications of Spatiotemporal Interoperability in Environmental and Emergency Management Ulrich Raape ResilientDecisions, Magdeburg, Germany Ingo Simonis University of Muenster, Germany Thomas Schulze Otto-von-Guericke-University Magdeburg, Germany Abstract: Interoperability of Systems and Services is gaining importance, but is mostly limited to a specific domain, e.g. the geospatial or modeling & simulation (M&S) domains. Spatiotemporal Interoperability describes an approach to exploit the synergies of coupling OGC-compliant services and HLA-based simulations in a standardized manner. The paper describes the current status of the Distributed spAtiotemporaL Interoperability Architecture (DALI), potential aplications as well as two prototypes in the area of Environmental and Emergency Management. Keywords: Spatial Data Infrastructures, Simulation, Interoperability, High Level Architecture, Critical Infrastructures, DALI 1 Introduction Environmental and Emergency Management (EM) are two application areas where often processes in both the spatial and temporal dimensions need to be modeled, forecasted, analysed for decision support and other tasks. Above that, EM often poses additional requirements regarding flexibility, ad-hoc configuration, or applicability in more than one phase of the EM cycle of Mitigation, Preparedness, Response and Recovery. While the geographic information (GI) and the modeling and simulation (M&S) domain both offer a wealth of systems, tools, services and concepts or architectures for interoperability, the access to services outside the “own domain” still results in proprietary solutions, leaving the need for cross-domain