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The virtual reconstruction of subterranean structures is a suitable scenario for the integration of different geomatics techniquesalthough narrow passages, lack of light and irregular surface can arise various problems in the data acquisition as well as processingprocedures. Generally the final product is a dense and detailed 3D model, whose number of triangles increases quickly according tothe complexity of the object. This complexity reduces the efficient use and dissemination of the produced information thereforeinnovative solutions are sought. The article presents the 3D surveying and modelling of underground passages of World War I(WWI) fortifications. After the acquisition of dense point clouds by means of terrestrial scanning (TLS), a simplification andoptimization workflow is performed with the aim of generating a lightweight product that keeps the maximum amount of significantinformation. A continuous scene representation with a 87% triangle reduction is generated, while the final precision is preservedaccording to a tolerance predefined by the final user. Such 3D product can be employed as basis for reconstruction, consolidation,preservation and valorisation of the WWI tunnels

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

3D SURVEYING & MODELING OF UNDERGROUND PASSAGES IN WWI FORTIFICATIONS