This report presents the implementation of a communication interface to bridge the gap between the semantic 3D city models of the Geographical information system (GIS) database and the scenarios creation environment for decision‐making in the conceptual phase of WP4. Section 2 describes the implementation of the interface with the semantic 3D city database through the data access layer (DAL). Section 3 presents an application of the interface to the GIS database of the Vevey test case.