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Title
New perspectives to save cultural heritage
Author
Altan, M. Orhan

ln:
LASER SCANNING AS A TOOL FOR ARCHEOLOGICAL RECONSTITUTION:
A GALLO-ROMAN TEMPLE IN NAIX-AUX-FORGES, FRANCE
D. Bur* , J-P. Perrin, A.Fuchs, V. Germonprez
bur@crai.archi.fr - perrin@crai.archi.fr - fuchs@crai.archi.fr - guermonprez@crai.archi.fr
MAP-CRAI: Centre de recherche en Architecture et Ingénierie - U.M.R. 694 MAP CNRS
2, rue Bastien Lepage 54001 Nancy Cedex - Tel: 03 83 30 81 46 / Fax: 03 83 30 81 27
WEB SITE : http://www.crai.archi.fr
KEY WORDS: Acquisition, scanner, modelling, close Range Photogrammetry and 3D Scanning, Archaeological Heritage
Conservation, Architectural Heritage Conservation, Measure, reconstruction.
ABSTRACT:
The DRAC** of Lorraine submitted us a project to produce a volumetric reconstitution of a roman temple on which little information
was available, using new technologies. Several archaeologists had prospected the site, gathering a lot of information about it, but
without compiling all this data in a single reconstitution of the building. What was proposed to them was to acquire digital data of
the pieces of the building in an attempt to deduce relevant measures in order to virtually re-build the edifice. First a database was
created to retrieve all the written information, and a set of requests was implemented to generate listings of documents concerning, a
fragment, a sculpture, and so on. A 2D plan of the site was drawn, based on the data available, and a digital photograph was taken of
each of the 2000 pieces found on the site. Secondly, we had to make accurate measurements of the most important architectural
elements of the temple: columns and pediment. We used a laser remote sensing device to scan the only two fragments of columns
remaining and the only dentil. The acquired point clouds were consolidated using reconstruction software. Applying mathematical
entities to sub-sets of points clouds we were able to determine the column diameter, the roof slope that we needed (among other data)
to choose between several volumetric reconstitution shapes. The main contribution of this work was, starting from a sketchy view of
the temple, to discover how imposing this edifice was. Remote sensing has been used to accurately calculate some important
measures, thus permitting its complete volumetric rebuild.
RÉSUMÉ:
La DRAC de Lorraine a soumis à notre laboratoire un projet de restitution volumétrique d’un temple romain basée sur les quelques
éléments d’information disponibles ainsi que l’utilisation de nouvelles technologies. Des archéologues ont collecté une grande
quantité de données sur le site mais sans en regrouper l’ensemble dans une reconstitution globale de l’édifice. Il leur a donc été
proposé une acquisition numérique des éléments du bâtiment afin d’en déduire des mesures suffisamment pertinentes pour une
reconstruction virtuelle de l’édifice. Dans un premier temps une base de données a été constituée afin d’en extraire des informations
écrites, des requêtes furent ensuite définies pour générer des listes de documents concernant un fragment, une sculpture, etc.. Un
plan en 2D du site fut établi en se basant sur les données disponibles puis une photo numérique de chacun des 2000 éléments
trouvés sur le site a été prise. Dans un second temps, nous avons dû réaliser des mesures précises des principaux éléments
architecturaux du temple, à savoir les colonnes et le fronton. Nous avons utilisé un scanner laser afin de mesurer les 2 derniers
fragments de colonne disponibles et l’unique denticule. Les nuages de point ainsi obtenus ont été consolidés à l’aide d’un logiciel de
reconstruction. L’application d’entités mathématiques sur ces nuages de points nous a permis de déterminer le diamètre de la colonne
ainsi que la pente du toit afin de choisir parmi différentes alternatives de reconstitutions volumétriques. L’apport essentiel de ce
travail fut la découverte de la taille importante de l’édifice. Le scanner laser nous a permis de déterminer avec précision quelques
mesures importantes afin d’aboutir à une reconstitution volumétrique complète.
1. INTRODUCTION
Initiative :
The demand of realization of a 3D model of the Gallo-Roman
temple of Nasium came from an association responsible for
promoting the site, under the aegis of David Mai ingrey. The
goal of this project is to promote the archaeological interest of
the site whose soil conceals numerous wealth.
Objectives:
The project consisted in doing a 3D reconstitution in computer
generated images of the temple, in order to establish a scientific
* Corresponding Author
** DRAC : Direction Régionale à l’Action Culturelle (Regional
document to analyze and validate the hypotheses for the virtual
restitution of the archaeological site.
Team :
The reconstitution required a collaborative work between the
MAP-CRAI and the archaeologists who supervised the digging
site, C. Gilquin and L. Legin, as well as an archaeology special
ist of the Gallo-Roman architecture: A. Olivier. A dialogue with
the other actors knowledgeable about the archaeological site
also permitted to deepen this work: G. Diss, curator of the Bar-
Le-Duc museum, R. and R. Hoffmann, in charge of the excava-
Office for Cultural Management)
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