Underwater photogrammetry in Antarctica: long-term observations in benthic ecosystems and legacy data rescue
Underwater photogrammetry in Antarctica: long-term observations in benthic ecosystems and legacy data rescue
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DOI：
10.1007/s00300-019-02480-w
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发表时间：
2019-06
期刊：
影响因子：
1.7
通讯作者：
Paola Piazza;V. Cummings;Alice Guzzi;I. Hawes;A. Lohrer;S. Marini;P. Marriott;F. Menna;E. Nocerino;A. Peirano;Sanghee Kim;S. Schiaparelli
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作者：
Paola Piazza;V. Cummings;Alice Guzzi;I. Hawes;A. Lohrer;S. Marini;P. Marriott;F. Menna;E. Nocerino;A. Peirano;Sanghee Kim;S. Schiaparelli
需要有关于群落结构和组成的可靠的基线资料，以便根据这些资料来检测和量化变化，这是南极洲公认的优先事项。在这方面，收集此类数据具有挑战性，特别是在海上，因为长期监测通常只有在永久研究站附近才具有后勤可行性。近年来，水下摄影测量作为一种非破坏性、低成本的高分辨率地形重建方法应运而生。我们决定将这种技术应用于2006年和2015年特提斯湾（南极洲罗斯海）南极底栖生物标准SCUBA调查期间记录的视频，最初并不适用于摄影测量。我们的目的是从长期监测的角度评估摄影测量方法描述底栖生物群落的有效性和实用性。为此，2017年重新访问了2015年调查的两个样带。用摄影测量程序处理视频，以获得海底和栖息生物的三维模型。总体而言，共分析了6个20米长的断面，相当于约200平方米的海底总面积。所得到的模型的精度，表示在长度测量误差（LME），平均为1.9毫米。2017年的样带显示了一些物种的显着差异，例如海胆数量增加了25-49% Sterechinus neumayeri（Meissner，1900）和一些海绵的完全消失Mycale（Oxymycale）acerata Kirkpatrick，1907。我们的分析证实了摄影测量监测方案的有效性，包括其对传统视频片段重新分析的价值。
The need for sound baseline information about community structure and composition against which changes can be detected and quantified is a well-recognised priority in Antarctica. Here, the collection of such data is challenging, especially at sea, where long-term monitoring is usually logistically feasible only in the proximity of permanent research stations. In recent years, underwater photogrammetry has emerged as a non-destructive and low-cost method for high-resolution topographic reconstruction. We decided to apply this technique to videos, recorded during standard SCUBA surveys of Antarctic benthos in Tethys Bay (Ross Sea, Antarctica) in 2006 and 2015 and originally not meant for photogrammetry. Our aim was to assess the validity and utility of the photogrammetric method to describe benthic communities from the perspective of long-term monitoring. For this purpose, two of the transects surveyed in 2015 were revisited in 2017. Videos were processed with photogrammetric procedures to obtain 3D models of the seafloor and inhabiting organisms. Overall, a total of six 20 m-long transects, corresponding to a total area of ~ 200 m2of seafloor were analysed. Accuracy of the resulting models, expressed in terms of Length Measurement Error (LME), was 1.9 mm on average. The 2017 transects showed marked differences in some species, such as a 25–49% increase in the number of sea urchinsSterechinus neumayeri(Meissner, 1900) and the complete disappearance of some spongesMycale(Oxymycale)acerataKirkpatrick, 1907. Our analyses confirm the efficacy of photogrammetry for monitoring programmes, including their value for the re-analysis of legacy video footage.