The contemporary city, with its components such as buildings, transportation networks, energy, and water systems, is now enriched by urban digital replicas. These digital tools, combining geometric and semantic data, play a crucial role in the in-depth understanding of territories. Thanks to these representations, it becomes possible to explore urban objects from various aspects: physical, functional, and operational.

In this context, this thesis proposes a methodology for dynamic and tangible digital representations of the city to provide interactive tools for territorial mediation and understanding of urban dynamics.

First, we explored the integration of documentary corpora into a 3D geospatial scene. We proposed four methodologies to integrate various multimedia content (images, videos, archival documents) while geolocating them in a digital representation of the city. This content enhances the understanding of the territory by contextualizing specific areas or buildings. Three consumption modes were developed to guide the user in their 3D navigation and structure access to information.

Secondly, we focused on integrating versioning of 3D geospatial data to visualize the temporal evolution of a territory. We proposed four forms of temporal navigation grouped into two main categories. These visualization forms allow navigation between different temporal versions of the same urban object while adapting to specific user needs. A user study helped refine these visualizations and establish a guide for their use.

Finally, we developed a methodology for designing augmented models using 2D and 3D geospatial data. This methodology combines a physical model made of Lego with its 3D digital representation and data projection. The modularity offered by Lego allows for easy modification of the model to represent different territories or urban scenarios. The projection of 2D data onto this model directs analysis towards specific themes (noise pollution, transportation, etc.), while the integration of multimedia content and temporal versions through the urban digital replica further enriches the user experience. This integration creates a comprehensive mediation tool for a territory, facilitating its understanding through the link between digital and tangible replicas.