Combining Photogrammetry and Subsurface Geophysics to Improve Historical Knowledge of Romanesque Churches in Normandy, France: Case Study of the Notre‐Dame‐du‐Val Chapel

IF 2.1 3区 地球科学 0 ARCHAEOLOGY
Cyrille Fauchard, Laure Aillaud, Astrid Legrand, Vincent Guilbert, Cyril Ledun, Bruno Beaucamp, Raphael Antoine
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Abstract

This study presents the results of aerial and geophysical measurements carried out on the Notre‐Dame‐du‐Val chapel in Sotteville‐sur‐Mer (Normandy, France), a former leprosarium dating from the 15th century; the chapel is now deconsecrated and has been showing signs of ageing in recent years. Restoration work is planned, and geophysical investigations of the area around the chapel have been commissioned. In this article, we propose a robust methodology combining aerial and terrestrial measurements in the visible range with surface prospecting methods. Compiling all the measurements within a perfectly georeferenced 3D model allows the joint analysis of the results of different physical measurement methods to provide unexpected architectural and archaeological information. Photos were taken from the ground and using a drone to build photogrammetric models of the interior and exterior of the chapel. Ground‐penetrating radar (GPR) and electrical resistivity tomography (ERT) were the two survey methods deployed in the area surrounding the chapel. The geophysical measurements clearly reveal traces of apses—which have now disappeared—at the crossing of what would have been the building's transept, which match up with the filled‐in openings that are present. The existence of these apses can only be assumed from inside the chapel. The resistivity anomalies are perfectly correlated with the radar anomalies and allow new hypotheses to be formulated about the original structure of the chapel. Finally, mapping the local geology of the surroundings based on a geophysical survey provides crucial information about the history of the church's construction. Bringing this unknown architectural element to light and carrying out precise mapping of the local geology surrounding the chapel constitute a major breakthrough, as this will make it possible to improve our knowledge of the history of the chapel, in particular its origins, through research based on archaeological surveys.
结合摄影测量学和地下地球物理学,增进对法国诺曼底罗马式教堂的历史了解:瓦尔圣母教堂案例研究
本研究介绍了对位于滨海索特维尔(法国诺曼底)的 Notre-Dame-du-Val 小教堂进行航拍和地球物理测量的结果。我们计划对其进行修复,并已委托对小教堂周围区域进行地球物理勘测。在本文中,我们提出了一种稳健的方法,将可见光范围内的空中和地面测量与地表勘探方法相结合。在一个完美的地理参照三维模型中汇集所有测量结果,可以对不同物理测量方法的结果进行联合分析,从而提供意想不到的建筑和考古信息。使用无人机从地面拍摄照片,建立小教堂内部和外部的摄影测量模型。地面穿透雷达(GPR)和电阻率层析成像(ERT)是在小教堂周围地区使用的两种测量方法。地球物理测量清楚地揭示了在建筑横廊交叉处的尖顶痕迹(现已消失),这些痕迹与现存的填充开口相吻合。只能从小礼拜堂内部推测这些尖顶的存在。电阻率异常现象与雷达异常现象完全相关,因此可以对小教堂的原始结构提出新的假设。最后,根据地球物理勘测绘制的周边地质图提供了有关教堂建造历史的重要信息。将这一不为人知的建筑元素公之于众,并对小教堂周围的当地地质进行精确测量,是一项重大突破,因为这将使我们有可能通过基于考古调查的研究,进一步了解小教堂的历史,特别是其起源。
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来源期刊
Archaeological Prospection
Archaeological Prospection 地学-地球科学综合
CiteScore
3.90
自引率
11.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The scope of the Journal will be international, covering urban, rural and marine environments and the full range of underlying geology. The Journal will contain articles relating to the use of a wide range of propecting techniques, including remote sensing (airborne and satellite), geophysical (e.g. resistivity, magnetometry) and geochemical (e.g. organic markers, soil phosphate). Reports and field evaluations of new techniques will be welcomed. Contributions will be encouraged on the application of relevant software, including G.I.S. analysis, to the data derived from prospection techniques and cartographic analysis of early maps. Reports on integrated site evaluations and follow-up site investigations will be particularly encouraged. The Journal will welcome contributions, in the form of short (field) reports, on the application of prospection techniques in support of comprehensive land-use studies. The Journal will, as appropriate, contain book reviews, conference and meeting reviews, and software evaluation. All papers will be subjected to peer review.
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