The fourth dimension in the georeferentiation of the historical iconography. New techniques and methodologies to analyze and document urban transformation: Rome from origins to nowadays

Enormous changes took place in cities over the years determining an evolution of the morphological variations in the territorial setup, in the architectural stratification and in perception and use of urban space. Bibliographical, iconographic and cartographic sources can contribute to providing a diachronic reconstruction of the urban fabric: these representations make it possible to understand the sites even if their accuracy is debatable. The creation of a virtual model based on 3D digital cartography that captures the current structure of the city can be used as a three-dimensional reference grid to visualise the spatial changes: this visualisation will be implemented using a procedure that works backwards in history. The task involves comparing the cartographic and iconographic data found during historical and documentary research with a grid developed using accurate topographic information. This will be achieved using elements of the urban structure (orographical features, empty urban spaces or existing building, etc.) that have not changed their position or morphological characteristics.