End to End Digitisation and Analysis of Three-Dimensional Coral Models, from Communities to Corallites.
End to End Digitisation and Analysis of Three-Dimensional Coral Models, from Communities to Corallites.
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DOI：
10.1371/journal.pone.0149641
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Reynaud EG
中科院分区：
文献类型：
--
作者：
Gutierrez-Heredia L;Benzoni F;Murphy E;Reynaud EG
珊瑚礁拥有近25%的海洋物种，为全世界5亿人提供食物来源，而只有很小一部分人被调查过。技术和处理的进步，加上价格合理的水下相机和互联网的可用性，使我们有可能提供工具和软件来调查整个珊瑚礁。珊瑚的整体生态分析不仅需要群落视图（10至100米），还需要单个群落分析和珊瑚鉴定。由于珊瑚是三维的，传统的方法来确定百分比覆盖和结构的复杂性跨越空间尺度是低效的，耗时的，仅限于专家。在这里，我们提出了一种端到端方法，使用低成本设备（GoPro，佳能）和免费软件（123D Catch， Meshmixer和Netfabb）来估计这些参数，允许每个社区参与调查和监测他们的珊瑚生态系统。我们对9种水下群落的大小和形态进行了验证。制作了具有高质量纹理映射和详细地形形态的水下群落、新鲜样本和漂白骨架的3D模型，并计算和分析了表面积和体积测量值（广泛用于生态和珊瑚健康研究的参数）。此外，我们将收集到的样品模型与单个珊瑚的微观摄影测量模型相结合，以帮助鉴定和菌落和息肉尺度分析。
Coral reefs hosts nearly 25% of all marine species and provide food sources for half a billion people worldwide while only a very small percentage have been surveyed. Advances in technology and processing along with affordable underwater cameras and Internet availability gives us the possibility to provide tools and softwares to survey entire coral reefs. Holistic ecological analyses of corals require not only the community view (10s to 100s of meters), but also the single colony analysis as well as corallite identification. As corals are three-dimensional, classical approaches to determine percent cover and structural complexity across spatial scales are inefficient, time-consuming and limited to experts. Here we propose an end-to-end approach to estimate these parameters using low-cost equipment (GoPro, Canon) and freeware (123D Catch, Meshmixer and Netfabb), allowing every community to participate in surveys and monitoring of their coral ecosystem. We demonstrate our approach on 9 species of underwater colonies in ranging size and morphology. 3D models of underwater colonies, fresh samples and bleached skeletons with high quality texture mapping and detailed topographic morphology were produced, and Surface Area and Volume measurements (parameters widely used for ecological and coral health studies) were calculated and analysed. Moreover, we integrated collected sample models with micro-photogrammetry models of individual corallites to aid identification and colony and polyp scale analysis.