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首页> 外文期刊>Journal of African earth sciences >Anza palaeoichnological site, Late Cretaceous, Morocco. Part Ⅲ: Comparison between traditional and photogrammetric records
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Anza palaeoichnological site, Late Cretaceous, Morocco. Part Ⅲ: Comparison between traditional and photogrammetric records

机译：Anza古代本体遗址，晚白垩群，摩洛哥。第三部分：传统和摄影测量之间的比较

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摘要

The present study evaluates a methodological workflow that could identify dinosaur tracks and trackways more comprehensively at outcrop scale. The approach described here is based both on 3D modelling by photogrammetry at different resolutions, and on suitably processed digital elevation models (DEMs). The ichnosite of Anza, Morocco, was chosen to demonstrate the efficiency of the proposed pipeline, because 323 dinosaur and pterosaur tracks discovered there have already been published. One subsector containing 89 tracks, identified in the two companion works that followed a traditional approach, was selected and divided into four subzones. By combining different DEM processes (hill-shade, slope, sky-view factor, and positive openness), almost twice as many tracks (175 vs 89) are now identified in these subzones. However, the improvement is not homogeneous. In the first subzone, the previous works reported 25 tracks vs. 22 with the 3D modelling techniques used here, whereas results for the second and third subzones show considerable improvement with 3D (21 vs 38 tracks and 42 vs 81 tracks, respectively). The enhancement is even more dramatic for the fourth subzone, where 34 new tracks are now identified, whereas with the traditional approach, only one track was previously reported. It is likely that such improvements depend on several factors, i.e. the surface conditions of the rocks (e.g. irregularities, cracking, etc.), and on the preservation state and depth of the tracks. Morphometric measurements of tracks and trackways obtained from 3D models are very similar to those derived from traditional fieldwork methods. The digital approach can be applied rapidly at different resolutions, but the models acquired with the pole-mounted camera provide a good compromise, with a resolution high enough (similar to 2 mm/pix) to spot tracks, while respecting computational constraints. Once treated, DEMs greatly facilitate the reproduction of track outlines, drawn according to criteria defined by the operator.
机译：本研究评估了一种方法论工作流程，可在露出露天度方面识别恐龙轨道和轨道轨道。这里描述的方法是基于不同分辨率的摄影测量的3D建模，以及适当处理的数字高度模型（DEM）。选择Anza，摩洛哥的ICHNITES，以证明拟议的管道的效率，因为已经发表了323个恐龙和翼龙轨迹。选择一个包含89个曲目的一个子级，在遵循传统方法的两个伴随作品中确定并分为四个子区。通过组合不同的DEM过程（山丘阴影，坡度，天空视图因子和正开放），现在在这些子区域中识别出几乎是轨道的两倍（175 VS 89）。然而，改善不是均匀的。在第一个子Zone中，先前的作品报告了这里使用的3D建模技术的25个曲目与22，而第二和第三子区域的结果显示了3D的相当大的改进（分别为21 Vs 38轨道和42Vs 81轨道）。对于第四个子区的增强更加戏剧，现在已经确定了34个新曲目，而以传统的方法，先前只报告了一条赛道。这种改进可能取决于若干因素，即岩石的表面状况（例如，不规则性，开裂等），以及轨道的保存状态和深度。从3D模型获得的曲目和轨道的形态测量与来自传统实地性方法的那些非常相似。数字方法可以在不同的分辨率下迅速施加，但是用杆安装的相机获取的模型提供了良好的折衷，分辨率足够高（类似于2 mm / PIX），同时尊重计算约束。一旦治疗，DEM非常方便轨道轮廓的再现，根据操作员定义的标准绘制。

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  • 来源
    《Journal of African earth sciences》 |2020年第12期|103985.1-103985.11|共11页
  • 作者

    Lkebir Noura; Rolland Tanguy; Monna Fabrice; Masrour Moussa; Bouchaou Lhoussaine; Fara Emmanuel; Navarro Nicolas; Wilczek Josef; Beraaouz El Hassan; Chateau-Smith Carmela; Perez-Lorente Felix;

  • 作者单位

    Ibn Zohr Univ Lab Appl Geol & Geoenvironm Agadir Morocco;

    Univ Bourgogne Franche Comte UMR CNRS 6298 ARTEHIS 6 Blvd Gabriel Bat Gabriel F-21000 Dijon France;

    Univ Bourgogne Franche Comte UMR CNRS 6298 ARTEHIS 6 Blvd Gabriel Bat Gabriel F-21000 Dijon France;

    Ibn Zohr Univ Lab Appl Geol & Geoenvironm Agadir Morocco;

    Ibn Zohr Univ Lab Appl Geol & Geoenvironm Agadir Morocco|Univ Mohamed VI Polytech Int Water Res Inst IWRI UM6P Benguerir Morocco;

    Univ Bourgogne Franche Comte UMR CNRS 6282 Biogeosci 6 Blvd Gabriel Bat Gabriel F-21000 Dijon France;

    Univ Bourgogne Franche Comte UMR CNRS 6282 Biogeosci 6 Blvd Gabriel Bat Gabriel F-21000 Dijon France|PSL Univ EPHE F-75014 Paris France;

    Univ Bourgogne Franche Comte UMR CNRS 6298 ARTEHIS 6 Blvd Gabriel Bat Gabriel F-21000 Dijon France|Univ Hradec Kralove Dept Archaeol Rokitanskeho 62 Hradec Kralove 50003 Czech Republic;

    Ibn Zohr Univ Lab Appl Geol & Geoenvironm Agadir Morocco;

    Univ Bourgogne CPTC EA 4178 4 Blvd Gabriel F-21000 Dijon France;

    Univ La Rioja Edificio CT Madre Dios 51-53 Logrono 26006 Spain;

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  • 正文语种 eng
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  • 关键词

    Dinosaur; Footprint; Documentation; Western high atlas; Ichnology; Recording methods;

    机译：恐龙;足迹;文档;西方高地图集;ICHNOGY;记录方法;

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