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首页> 外文期刊>International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences >UNDERWATER PHOTOGRAMMETRY DIGITAL SURFACE MODEL (DSM) OF THE SUBMERGED SITE OF THE ANCIENT LIGHTHOUSE NEAR QAITBAY FORT IN ALEXANDRIA, EGYPT
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UNDERWATER PHOTOGRAMMETRY DIGITAL SURFACE MODEL (DSM) OF THE SUBMERGED SITE OF THE ANCIENT LIGHTHOUSE NEAR QAITBAY FORT IN ALEXANDRIA, EGYPT

机译：埃及亚历山大港QAITBAY堡垒附近古灯塔水下摄影机的水下照相数字化表面模型（DSM）

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Underwater photogrammetry in archaeology in Egypt is a completely new experience applied for the first time on the submerged archaeological site of the lighthouse of Alexandria situated on the eastern extremity of the ancient island of Pharos at the foot of Qaitbay Fort at a depth of 2 to 9 metres. In 2009/2010, the CEAlex launched a 3D photogrammetry data-gathering programme for the virtual reassembly of broken artefacts. In 2013 and the beginning of 2014, with the support of the Honor Frost Foundation, methods were developed and refined to acquire manual photographic data of the entire underwater site of Qaitbay using a DSLR camera, simple and low cost materials to obtain a digital surface model (DSM) of the submerged site of the lighthouse, and also to create 3D models of the objects themselves, such as statues, bases of statues and architectural elements. In this paper we present the methodology used for underwater data acquisition, data processing and modelling in order to generate a DSM of the submerged site of Alexandria’s ancient lighthouse. Until 2016, only about 7200?msup2/sup of the submerged site, which exceeds more than 13000?msup2/sup, was covered. One of our main objectives in this project is to georeference the site since this would allow for a very precise 3D model and for correcting the orientation of the site as regards the real-world space.
机译：埃及考古学中的水下摄影测量技术是一种全新的体验，它是首次在位于Qaitbay堡脚下，古老的Pharos岛东端的亚历山大灯塔的水下考古现场中，深度2至9英尺。米。在2009/2010年，CEAlex启动了3D摄影测量数据收集程序，用于虚拟重组损坏的文物。在2013年和2014年初，在荣誉弗罗斯特基金会（Honor Frost Foundation）的支持下，开发并改进了方法，以使用DSLR相机，简单和低成本的材料获取Qaitbay整个水下地点的手动摄影数据，从而获得数字表面模型（DSM），然后创建对象本身的3D模型，例如雕像，雕像的底座和建筑元素。在本文中，我们介绍了用于水下数据采集，数据处理和建模的方法，以生成亚历山大古灯塔淹没地点的DSM。直到2016年，仅覆盖了大约7200？m 2 ，超过13000？m 2 。我们在此项目中的主要目标之一是对站点进行地理配准，因为这将允许非常精确的3D模型，并根据实际空间校正站点的方向。

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