ACCURACY AND BLOCK DEFORMATION ANALYSIS IN AUTOMATIC UAV AND TERRESTRIAL PHOTOGRAMMETRY – LESSON LEARNT –

International audience; The paper rep orts the results of an integrated Unmanned Aerial Vehicle (UAV) and terrestrial photogrammetric survey realized in the archaeological site of the Roman theatre in Ventimiglia, Italy. The main deliverables were 2D drawings at scale 1:20, which required a Ground Sample Distance (GSD) less than 4 mm and, consequently, accuracy better than 4 mm. The UAV was employed to acquire both vertical and oblique images, while the terrestrial imaging acquisition was realized with the aim of generating separate dense point clouds of some vertical structures, corresponding to the sections required. The variability of results with automatic photogrammetric procedures against different image network configurations, with and without ground control, are analyzed and presented

Computer aided tools for architectural and urban automatic generation

As fórmulas na arquitectura / 4.º Seminário Internacional de Arquitectura e Matemática ; coordenação de Fátima Silva, Elsa Negas, Rui Seco. - Lisboa : Universidade Lusíada, 2020. - P. 31-44.Computer-aided design tools have been used in architecture and design offices for more than 30 years. It must be said that, from the beginning, they have behaved more like over-equipped drawing tools than as true supports for the creative process. In recent years, additional modules (plug-ins or dedicated libraries) make it possible to enrich the software environments already implemented in creative agencies: whether in the field of design, urban planning or architecture, these tools can generate and optimize on demand an infinite number of formal or conceptual solutions whose feasibility or effectiveness in terms of input constraints can be evaluated, for example, by bio-inspired processes. It is in this context that we put to test some generative tools able to quickly process hypothetical architectural or urban digital simulacra for a given historical period. Whether for the restoration of the ancient city of Vienna (France), to show the inhabited slopes of the Fourvière hill during the time of Lugdunum, to illustrate the historic urban fabric of the “Vieux Lyon” district or more recently as part of the exhibition “Claude, un empereur au destin singulier”, these generative tools are based on current knowledge of the architectural, constructive or stylistic constants over time: they thus make it possible to quickly produce plausible 3D images of squares, streets or buildings during the period of interest. Former experiments raised the question of the discontinuity of the generative models used, which will have to be applied differently not only according to the scale (bay, facade, building, block, district...) but also according to the nature of the objects to be represented (vernacular islets, residential or monumental buildings etc.) or the knowledge available about them (knowledge consistency, divergent historical conjectures etc.). The MAP laboratory has developed over time some simple software tools that made it possible to question in depth the structure of generative methods involved in the production of plausible architectural and urban digital reconstructions

Restituer la morphologie des villes portuaires antiques : de l’image 2D à la 3D

Les champs disciplinaires de l’historien et de l’archéologue nous éclairent aujourd’hui de manière extrêmement documentée sur la « réalité » urbaine, architecturale et sociale des mondes disparus. Cependant, la plupart de ces travaux ne prêtent aux outils numériques de modélisation et de représentation de l’espace qu’un rôle « d’artiste éclairé » auquel on demande – au moment où l’on range les outils dévolus au relevé et à la fouille – d’illustrer les hypothèses retenues par ces éminents spécialistes de l’histoire. En effet, le processus de synthèse intervenant lors de la restitution finale de l’espace anthropique – mobilisant souvent des dispositifs techniques complexes et très spécialisés – entre en scène presque toujours en « bout de course » alors que l’harmonisation des apports scientifiques issus des disciplines afférentes au contexte de l’étude ont déjà en quelque sorte « figé » le panorama des hypothèses envisageables, notamment dans la restitution de la morphologie urbaine ou de la représentation de l’architecture vernaculaire. En prenant appui sur un vaste corpus iconographique représentant les espaces portuaires de la période impériale romaine et tirant parti de l’expérience menée autour du port de Portus, ce projet de recherche, financé par le Labex IMU, essaiera tout au long de son existence de briser ce tabou

ACCURACY AND BLOCK DEFORMATION ANALYSIS IN AUTOMATIC UAV AND TERRESTRIAL PHOTOGRAMMETRY-LESSON LEARNT

International audienceThe paper reports the results of an integrated Unmanned Aerial Vehicle (UAV) and terrestrial photogrammetric survey realized in the archaeological site of the Roman theatre in Ventimiglia, Italy. The main deliverables were 2D drawings at scale 1:20, which required a Ground Sample Distance (GSD) less than 4 mm and, consequently, accuracy better than 4 mm. The UAV was employed to acquire both vertical and oblique images, while the terrestrial imaging acquisition was realized with the aim of generating separate dense point clouds of some vertical structures , corresponding to the sections required. The variability of results with automatic photogrammetric procedures against different image network configurations, with and without ground control, are analysed and presented

Numérisation 3D du bâti patrimonial

La numérisation 3D des bâtiments et ouvrages d’art peut servir différents objectifs comme la surveillance ou la restauration et la conservation. Les scientifiques ont recours à des drones, car ils permettent d’acquérir rapidement des images de structures souvent difficiles d’accès, et d’extraire des points caractéristiques afin d’en calculer les coordonnées spatiales et obtenir un modèle tridimensionnel de l’ouvrage ciblé.Cette approche nécessite l’élaboration d’une méthodologie spécifique associant architectes, ingénieurs, historiens et informaticiens. Des directives précises sur les incidences de vue, la distance, la luminosité et l’homogénéité des prises de vues sont nécessaires pour garantir la qualité de la reconstruction 3D de l’ouvrage ciblé

An immersive visualization kit for online 3D objects databases

International audienceThe present challenge to preserve cultural heritage, dealing with the rise of new technological advances in terms of spatial data gathering, led to the massive surge of digital content and more than anything, to 3D models. These models, supporting analysis and valuation in archeology, architecture, cultural heritage and furniture design, are often gathered within huge databases. The core question of this presentation concerns the optimal strategy for its distribution and the specific methods involved to access and navigate through its heterogeneous data system. This paper also describes our KIVI1 hardware and software platform for immersive visualization, defining an original easy-to-use data crawling approach, optimizing its dissemination and exploitation through diverse cultural heritage digital content

TAG 3D : Trajectoires optimales pour l'acquisition de géométries 3D du bâti patrimonial (DÉFI-IMAGIN CNRS)

National audienceLa modélisation 3D de bâtiments par photogrammétrie requiert l’acquisition d’images depuis de multiples points de vue:leur positionnement est primordial car il déterminera l’étendue du relevé et la précision de la mesure. Afin d'obtenir les meilleurs résultats, on fait souvent appel à un “empirisme expérimental“ qui essaye de satisfaire au mieux les spécificités géométriques de l’objet à acquérir

Ec-Co-Gen : An evolutionary simulation assisted design tool for energy rating of buildings in early design stage to optimize the building form

International audienceIn the framework of the present study the software EcCoGen was developed from scratch, in order to assist the architects and engineers during the early design stages. More precisely, the environmental qualities of dynamic composite envelopes have been selected to guide the design through an evolutionary process. The main objective of the research presented here aims to attrack more interest in the initial phases of the design, seeking to specify a tool that facilitates and encourages the creativity in the framework of bioclimatic design. Having under consideration the established and structured knowledge about the design process, the thermal properties of composite dynamic envelopes and evolutionary methods, we propose a tool based on a Interactive Genetic Algorithm (IGA) that is implemented in the original modeller software. At this stage, regarding the energy consumption evaluation in the initial design phase the method that we used is developed based on common energy model simplifications, and original developed regression models; however, at this stage the evaluation is limited to simplified seasonal heat loss model. In addition, it takes into account the solar gains depending on the orientation and inclination of the dynamic envelope’s surfaces. Since this research focus on early design stages, the detailed description of the envelope is not possible. For this reason, the description of the inertia characteristics of the building remains approximate. Finally an original Graphical User Interface (GUI) is conceived