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Geometric and thematic enrichment of frontages in 3D city-models.

Urban space is a three-dimensional space. That is why the 3D is often required when it is a question of representing it. G.I.S. existing applications already propose 3D tools, but actually, these tools are only visualization tools, mainly designed to facilitate the understanding of the urban space. The tools developed within the laboratory MAP-PAGE propose to enrich the urban models generally resulting from aerial photogrammetry by using photographs of the frontages of the buildings. Indeed, these images make it possible to integrate a certain number of data by describing three-dimensional phenomenon pushed aside by the mono-surface representation of the frontages (number of stories, overhanging parts of the building, balconies, etc). Beside contributing to a thematic enrichment of the urban model, the possibility of measuring on the pictures will also allow a geometrical enrichment of the model.