Giorgia Gatta

Digital Processing and 3D Modelling of an 18th Century Scenographic Map of Bologna

Metric recovery and digital processing of historical cartography not only allow preserving mapping heritage but also give new possibilities for the use of this information, unachievable using the analogical support. The often poor metric quality of an ancient map is balanced by the value and the richness of its contents and also by the potentialities that the same map can offer in a digital form. In this work some tests of digital elaboration, performed on a perspective map of Bologna (Italy), dating 1702, are reported: georeferencing, analysis of map deformation induced by the adopted transformation technique, three-dimensional modelling and texturization of historical buildings with present images, fusion of data coming from different sources and insertion in Earth-viewer environment.

Integrated Methodologies for the 3D Survey and the Structural Monitoring of Industrial Archaeology: The Case of the Casalecchio di Reno Sluice, Italy

The paper presents an example of integrated surveying and monitoring activities for the control of an ancient structure, the Casalecchio di Reno sluice, located near Bologna, Italy. Several geomatic techniques were applied (classical topography, high-precision spirit levelling, terrestrial laser scanning, digital close-range photogrammetry, and thermal imagery). All these measurements were put together in a unique reference system and used in order to study the stability and the movements of the structure over the period of time observed. Moreover, the metrical investigations allowed the creation of a 3D model of the structure, and the comparison between two situations, before and after the serious damages suffered by the sluice during the winter season 2008-2009. Along with the detailed investigations performed on individual portions of the structure, an analysis of the whole sluice, carried out at a regional scale, was done via the use of aerial photogrammetry, using both recently acquired images and historical photogrammetric coverage. The measurements were carried out as part of a major consolidation and restoration activity, carried out by the “Consorzio della Chiusa di Casalecchio e del Canale di Reno”.

Analysis of Pre-Geodetic Maps in Search of Construction Steps Details

Cartographic Heritage consists in the whole amount of ancient cartographic documents (not only maps, but also atlas, planispheres, globes, ...) the history has brought us, today perceived as a cultural value to be necessarily preserved due to its historical and geographical content as well as its artistic value. It is a great but often poorly known heritage, because usually ancient cartographic documents are kept in places closed to the public, and only occasionally they are proved valuable outside of specific research activities.