Abstract
The digitization of Cultural Heritage paves the way for new approaches to surveying and restitution of historical sites. With a view to the management of integrated programs of documentation and conservation, the research is now focusing on the creation of information systems where to link the digital representation of a building to semantic knowledge. With reference to the emblematic case study of the Calci Charterhouse, also known as Pisa Charterhouse, this contribution illustrates an approach to be followed in the transition from 3D survey information, derived from laser scanner and photogrammetric techniques, to the creation of semantically enriched 3D models. The proposed approach is based on the recognition -segmentation and classification- of elements on the original raw point cloud, and on the manual mapping of NURBS elements on it. For this shape recognition process, reference to architectural treatises and vocabularies of classical architecture is a key step. The created building components are finally imported in a H-BIM environment, where they are enriched with semantic information related to historical knowledge, documentary sources and restoration activities.
Highlights
Three-dimensional models are increasingly being used for the graphic representation of cultural heritage items
The created building components are imported into a heritage building information modelling environment, where they are enriched with semantic information related to historical knowledge, documentary sources and restoration activities
It is possible to identify the following phases in the process that leads to the attainment of structured models from raw data (Figure 1): I) acquisition of survey data through laser scanning, photogrammetry or a combination of both techniques; II) first data processing, including point cloud registration, subsampling and noise removal; III) segmentation and classification of architectural elements; IV) construction of the 3D model and semantic enrichment
Summary
Three-dimensional models are increasingly being used for the graphic representation of cultural heritage items. It is possible to identify the following phases in the process that leads to the attainment of structured models from raw data (Figure 1): I) acquisition of survey data through laser scanning, photogrammetry or a combination of both techniques; II) first data processing, including point cloud registration, subsampling and noise removal; III) segmentation and classification of architectural elements; IV) construction of the 3D model and semantic enrichment The aim of this contribution is to show how these different phases of the process develop and support one another based on an examination of studies involving the recovery and conservation of cultural heritage objects.
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