Abstract
Abstract. In the last years the image-based pipeline for 3D reconstruction purposes has received large interest leading to fully automated methodologies able to process large image datasets and deliver 3D products with a level of detail and precision variable according to the applications. Different open issues still exist, in particular when dealing with the 3D surveying and modeling of large and complex scenarios, like historical porticoes. The paper presents an evaluation of various surveying methods for the geometric documentation of ca 40km of historical porticoes in Bologna (Italy). Finally, terrestrial photogrammetry was chosen as the most flexible and productive technique in order to deliver 3D results in form of colored point clouds or textured 3D meshes accessible on the web. The presented digital products are a complementary material for the final candidature of the porticoes as UNESCO WHS.
Highlights
In the last years, 3D reconstruction methods became very popular with a large proliferation of 3D geometric models, often accessible on the web via dedicated portals and viewers
Automation is undoubtedly very important, different open issues still exist, in particular when dealing with the 3D surveying and modeling of large and complex scenarios, like historical porticoes
The paper presents an investigation on various 3D surveying techniques for the digital reconstruction of ca 43 km of historical porticoes in Bologna, Italy (Fig. 1), that contribute to classify the historical center of Bologna as one of the most unique and best preserved in Europe, but with fragmentary knowledge
Summary
3D reconstruction methods became very popular with a large proliferation of 3D geometric models, often accessible on the web via dedicated portals and viewers. Such models are often created with fully automated methodologies or low-cost sensors and feature a level of detail and precision variable according to the applications and needs. The 3D surveying results are the base for new studies and new management and planning techniques For these latter aims, such complex scenario needs new approaches and IT solutions, e.g. for an accurate management of facades conservation (planning and single unit design), surfaces and pavements cleaning, unified lighting systems, etc
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