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Communication Dans Un Congrès Année : 2015

A systematic photogrammetric survey in a context of preventive archaeology : the collective burial of "Cavalade - Mas Rouge"

Résumé

The collective burial of “Cavalade – Mas Rouge” was discovered before the construction of the A9 bypass of Montpellier city (Hérault, Languedoc-Roussillon, France). An excavation of this structure took place from August 2013 to January 2014. It is located on the outskirts of a previously excavated Neolithic village and was used around -3300 BC. The burial place occupies a large digging of 6 meters by 4 meters and 2 meters deep. The primary purpose of this cavity was a large domestic cellar. The funeral destination took place in a second time. The context and characteristics of this structure has led us to choose a recording method that permits an exhaustive and rapid acquisition. A specific recording protocol was set before the excavation phase in consultation with the administering authority for archeology (Service Régional de l’Archéologie). The objectives were to record all human remains and artifacts in three dimensions in a reliable and systematic manner. The manual drawing was excluded given the time constraints, the classical image registration could not guarantee the requested accuracy, and the use of a laser-scanner was not appropriate. Consequently, photogrammetric survey has been chosen for its set up comfort and low cost. The process allows, for each stage of digging, to produce an orthophotography and a digital elevation model (DEM). The resolution of these orthophotographies is 0.5 mm. The horizontal and vertical accuracy of the DEM is millimetric. Twenty photogrammetric surveys were conducted during five months : one 20-minute acquisition per week. The computations were performed with the MicMac software suite developed by the French National Institute of Cartography (IGN). It is dedicated to scientific purpose and is distributed under a free and open-source license. Tacheometric surveys were only used to measure ground control points. An overall photogrammetric survey of the cellar was also conducted at the end of the excavation. All produced data can be exploited through the QuatumGIS software. To our knowledge, a photogrammetric survey of such a volume in a context of preventive archeology remains unique. It has led to a significant gain of efficiency, time and accuracy. The interest of this case study also lies in the use of a completely free and open-source professional software suite. In the short term, this method could be used on a regular basis on other similar projects.
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Dates et versions

hal-02072223 , version 1 (19-03-2019)

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  • HAL Id : hal-02072223 , version 1

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Maxime Seguin, Yaramila Tchérémissinoff. A systematic photogrammetric survey in a context of preventive archaeology : the collective burial of "Cavalade - Mas Rouge". CAA2015 - 43rd Computer Applications and Quantitative Methods in Archaeology, Universita di Siena, Apr 2015, Siena, Italy. ⟨hal-02072223⟩
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