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This paper is dedicated to the digitization of blocks and virtual anastylosis of an antique façade in Pont-Sainte-Maxence (France). In\ud2014 during the construction of a shopping center, the National Institute for Preventive Archaeological Research (INRAP)\uddiscovered a Gallo-Roman site from the 2<sup>nd</sup> century AD. The most interesting part of the site for the study is a façade of 70 meters\udlong by nearly 10 meters high. The state of the conservation of the blocks of the façade makes them exceptional due to the question\udraised by the collapse. Representative and symbolic blocks of this building have been selected for a virtual anastylosis study. The\udblocks discovered belong to different types: decorated architectural blocks, monumental statuary elements and details of very fine\uddecorations. The digital reproduction of the façade will facilitate the formulation of hypothesis for the collapse of the structure. The\udPhotogrammetry and Geomatics Group from INSA Strasbourg is in charge of the digitization, the anastylosis and the development of\udexploratory methods for understanding the ruin of the façade. To develop the three-dimensional model of the facade, approximately\ud70 blocks of various dimensions were chosen by the archaeologists. The choice of the digitization technique is made according to the\udfollowing pragmatic criterion: the movable objects are acquired with a scan-arm or a hand-held scanner in the laboratory and the\udlargest blocks are recorded by photogrammetry at the repository near Paris. The expected types of deliverables are multiple: very\udaccurate 3D models with the most faithful representation to document the objects in the best way and with optimized size model\udallowing easy handling during anastylosis tests. The visual aspect of the models is also a very important issue. Indeed, textures from\udphotos are an excellent way to bring about the realism of the virtual model, but fine details of the object are sometimes blurred by the\uduniformity of the color of the original material. Acquisition by hand-held scanner does not provide the textures (they must be\udacquired according to a complementary process). The data types are therefore different depending on the acquisition. The type of\udrendering of the models depends therefore on precise choices to be defined optimally. After the acquisition, hypothesis for the\udconstruction of the façade must be validated and / or adapted by the anastylosis of the digitized blocks. Different cases must be taken\udinto account. First, the reconstruction of broken blocks is done by adjusting the recovered fragments. If all the fragments discovered\udare close to the initial shape of the block, the process is assimilated to a puzzle of complex surfaces. If the fragments have no contact\udbut are an integral part of the block, the proportion of hypotheses in relation to the contact pieces is changed. And finally, if the\udblocks are to be assembled together by superposition and thanks to a common plan, as assumed during the construction, the\udrestitution could be based on the positions of discoveries and hypotheses based on the architectural knowledge of this period. Each of\udthese three methods of reconstruction involves different processes. The three-dimensional model will be validated by the positioning\udof the blocks and extended according to the actual dimensions of the façade. Different collapse scenarios will result from this study

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

DIGITIZATION OF BLOCKS AND VIRTUAL ANASTYLOSIS OF AN ANTIQUE FACADE IN PONT-SAINTE-MAXENCE (FRANCE)