| Rilievo stereofotogrammetrico delle mura romane di Aosta |
Pagina 1 di 2 Company Name/Author: ITABC-CNR, P. Salonia's teamReference url: www.itabc.cnr.it www.arkis.it Project date: 2004-2006 Project place: Aosta, Italy Used product: Stereoview/Cyclop Used camera: Nikon D-100 calibrated Used lens: Nikkor 24mm, Nikkor 35mm Strip number: 2540 circa Baseline: 1200 mm Related Document:  Stereo-photogrammetric survey of the Aosta roman city wallAbstract: The critical process of reading the artefacts has been facilitated by the introduction of Computer Science in the field of documentation and survey of architectural heritage. Indeed, computer-based techniques have strongly modified the acquisition phase as well as subsequent operations such as computation and management of information coming from different fields. For instance, it is possible to add further information, such as qualitative data, morphology, colour information and so on, to photogrammetric acquisition. This paper focuses on experimental results deriving from the application of quick photogrammetric stereoscopic systems to surveying and documenting the Roman city walls in Aosta, a circuit of five kilometres around the town (internal and external sides). The final result is composed of metric raster stereoscopic strips, explorable in a stereoscopic environment, where it is possible to perform three-dimensional measures and to survey conservation status. In this way is possible to avoid the vectorial phase which often represents a subjective abstraction from the truth: the raster strips provide a corpus of information deriving from the geometrically controlled stereoscopic pairs, which are qualitatively and quantitatively richer than a traditional relief. The innovative photogrammetric system tested is a digital mono-camera system which has the advantages of a bi-camera based system and allows stereoscopic acquisition that can be used directly for restitution. This system guarantees the same accuracy of geometric data acquisition as a traditional stereoscopic method, which is fundamental in the process of diagnosing the state of conservation. Although the system does not need topographical support, the latter was nevertheless provided in order to verify the reliability of the test system, the accuracy of the results obtained and to set the stereoscopic models properly in real space. All the photographic stereoscopic pairs were processed using dedicated software that allowed control points to be added (natural and targets deriving from topographic survey) in order to minimize errors in overlapping stereoscopic models. Gallery |
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