Photogrammetric reconstructions of the Aldegondabreen glacier on Svalbard from 17 archival terrestrial oblique photographs taken in 1910 and 1911 reveal a past volume of 1373.7 ± 78.2 · 106 m3; almost five times greater than its volume in 2016. Comparisons to elevation data obtained from aerial and satellite imagery indicate a relatively unchanging volume loss rate of − 10.1 ± 1.6 · 106 m3 a−1 over the entire study period, while the rate of elevation change is increasing. At this rate of volume loss, the glacier may be almost non-existent within 30 years. If the changes of Aldegondabreen are regionally representative, it suggests that there was considerable ice loss over the entire 1900s for the low elevation glaciers of western Svalbard. The 1910/11 reconstruction was made from a few of the tens of thousands of archival terrestrial photographs from the early 1900s that cover most of Svalbard. Further analysis of this material would give insight into the recent history and future prospects of the archipelago's glaciers. Photogrammetric reconstructions of this kind of material require extensive manual processing to produce good results; for more extensive use of these archival imagery, a better processing workflow would be required.

中文翻译：

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Aldegondabreen 冰川自 1910 年以来从存档的陆地和航空照片的运动摄影测量的变化：利用历史档案获得世纪规模的斯瓦尔巴冰川质量损失

根据 1910 年和 1911 年拍摄的 17 张档案地面倾斜照片，对斯瓦尔巴群岛 Aldegondabreen 冰川的摄影测量重建显示过去的体积为 1373.7 ± 78.2 · 106米3; 几乎是 2016 年体积的五倍。与从航空和卫星图像获得的高程数据进行比较表明，体积损失率相对不变，为 − 10.1 ± 1.6 · 106米3一种-1在整个研究期间，海拔变化率正在增加。以这种体积损失的速度，冰川可能在 30 年内几乎不存在。如果 Aldegondabreen 的变化具有区域代表性，这表明在整个 1900 年代，斯瓦尔巴群岛西部的低海拔冰川存在相当大的冰损失。1910/11 年的重建是根据 1900 年代初期覆盖斯瓦尔巴群岛大部分地区的数万张地面档案照片中的几张照片制作的。对这种材料的进一步分析将有助于深入了解群岛冰川的近期历史和未来前景。这种材料的摄影测量重建需要大量的手动处理才能产生良好的结果；为了更广泛地使用这些档案图像，需要更好的处理工作流程。