Expérience de relevé par photogrammétrie en archéologie préventive

Mehdi Belarbi, Pascal Raymond, Nicolas Saulière, Régis Touquet

«Archeologia e Calcolatori» 2014, Supplemento 5, 34-46

Abstract

Archaeological surveys apply to remains of various size and complexity. Our daily missions lead us to choose our means of planning with a great variation of scales. Up until now, at the Inrap, hand drawing and topography helped us conduct survey operations by recording brief amounts of information according to simplified geometric shapes. Computer evolution now offers solutions which allow us 3D acquisition by photogrammetry. They come as an additional topographic plan and can even replace our drawing of artifacts with accurate information which is not possible to achieve with traditional methods. 3D use makes representation easier in any type of projection. Free or with parameters, it simplifies the realisation of a global view by registering in the graphic chain as envisaged today. Taking measurements by traditional means requires much time which could be better used for study. Our approach which tends to dissociate the register of geometrics in the interpretation of remains, creates a more accurate frame¬work for the analysis. Archaeological artifacts also benefit from 3D acquisition advantages. Indeed, what generally defines archaeological drawing is the application of graphic standards in descriptive geometry. This review of the artifacts is a difficult exercise and modeling makes it easier. The illustrations obtained therefore constitute a reliable geometrically graphic basis on which observations and analysis results can be reported. We found that 3D acquisition by photogrammetry was a suitable and flexible solution to our activities. The richness and quality of these surveys are an asset for the analysis and storage of information. Moreover, the time invested in these projects is less than that used with traditional planning methods.

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