Automatic delineation of glacier grounding lines in differential interferometric synthetic-aperture radar data using deep learning.
Automatic delineation of glacier grounding lines in differential interferometric synthetic-aperture radar data using deep learning.
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DOI：
10.1038/s41598-021-84309-3
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发表时间：
2021-03-02
影响因子：
4.6
通讯作者：
Milillo P
中科院分区：
文献类型：
--
作者：
Mohajerani Y;Jeong S;Scheuchl B;Velicogna I;Rignot E;Milillo P
划定海洋终止冰川的接地线——冰开始在海水中漂浮的地方——对于测量和理解冰盖质量平衡、冰川动力学及其对海平面上升的贡献至关重要。这项任务以前是由人工专家完成的，耗时且主要是人工对差分干涉合成孔径雷达干涉图进行数字化处理。随着卫星观测数量的快速增长，以及需要建立具有量化不确定性的整个大陆的时间序列，这种方法已不再可行。我们提出了一个全卷积神经网络，它具有并行的非对称卷积层和非对称编码器/解码器组件，可以大规模、高效地自动描绘接地线，并伴有不确定性估计。我们的程序在100米张贴干涉图中检测232米内的接地线，其性能与人类专家的性能相当。我们也发现了机器学习方法在挑战人类专家的情况下的价值。我们使用这种方法绘制了2018年以来22935张干涉图中南极洲周围接地线位置的潮汐引起的变化。沿着南极洲西部的盖兹冰架，我们证明了接地带比流体静力平衡的预期宽一个数量级（13.3±3.9），这证明了需要重复和全面地绘制接地线以为数值模型提供信息。
Delineating the grounding line of marine-terminating glaciers—where ice starts to become afloat in ocean waters—is crucial for measuring and understanding ice sheet mass balance, glacier dynamics, and their contributions to sea level rise. This task has been previously done using time-consuming, mostly-manual digitizations of differential interferometric synthetic-aperture radar interferograms by human experts. This approach is no longer viable with a fast-growing set of satellite observations and the need to establish time series over entire continents with quantified uncertainties. We present a fully-convolutional neural network with parallel atrous convolutional layers and asymmetric encoder/decoder components that automatically delineates grounding lines at a large scale, efficiently, and accompanied by uncertainty estimates. Our procedure detects grounding lines within 232 m in 100-m posting interferograms, which is comparable to the performance achieved by human experts. We also find value in the machine learning approach in situations that even challenge human experts. We use this approach to map the tidal-induced variability in grounding line position around Antarctica in 22,935 interferograms from year 2018. Along the Getz Ice Shelf, in West Antarctica, we demonstrate that grounding zones are one order magnitude (13.3 ± 3.9) wider than expected from hydrostatic equilibrium, which justifies the need to map grounding lines repeatedly and comprehensively to inform numerical models.
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影响因子：
5.2
作者：
Rignot, E.;Mouginot, J.;Scheuchl, B.
通讯作者：
Scheuchl, B.
影响因子：
5
作者：
Mouginot, Jeremie;Rignot, Eric;Millan, Romain
通讯作者：
Millan, Romain
影响因子：
5.2
作者：
Horgan, H. J.;Anandakrishnan, S.
通讯作者：
Anandakrishnan, S.
影响因子：
5.2
作者：
Rignot, E.;Mouginot, J.
通讯作者：
Mouginot, J.
影响因子：
5.2
作者：
Morlighem M;Williams CN;Rignot E;An L;Arndt JE;Bamber JL;Catania G;Chauché N;Dowdeswell JA;Dorschel B;Fenty I;Hogan K;Howat I;Hubbard A;Jakobsson M;Jordan TM;Kjeldsen KK;Millan R;Mayer L;Mouginot J;Noël BPY;O'Cofaigh C;Palmer S;Rysgaard S;Seroussi H;Siegert MJ;Slabon P;Straneo F;van den Broeke MR;Weinrebe W;Wood M;Zinglersen KB
通讯作者：
Zinglersen KB