Glacier Image Velocimetry: an open-source toolbox for easy and rapid calculation of high-resolution glacier velocity fields
Glacier Image Velocimetry: an open-source toolbox for easy and rapid calculation of high-resolution glacier velocity fields
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DOI：
10.5194/tc-15-2115-2021
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发表时间：
2021-04-28
期刊：
影响因子：
5.2
通讯作者：
Wickert, Andrew D.
中科院分区：
文献类型：
--
作者：
de Vries, Maximillian Van Wyk;Wickert, Andrew D.
我们提出了冰川图像测速（GIV），一个开源和易于使用的软件工具包，用于快速计算高空间分辨率的冰川速度场。冰川冰速度场揭示了流动动力学、冰通量变化和（通过额外的数据和建模）冰厚度。用实地技术在广大地区获得冰川速度测量值是一项劳动密集型工作，而且往往存在安全风险。最近增加的高分辨率，短重复时间的光学图像的可用性，使我们能够获得冰位移场使用“功能跟踪”的基础上匹配持续的不规则性的图像之间的冰面上，因此，随着时间的推移，表面速度。GIV是完全并行化的，可以自动检测，过滤和提取大型图像数据集的速度。通过这个耦合的工具链和易于使用的GUI，GIV可以在笔记本电脑或台式电脑上快速分析数百到数千个图像对。我们提出了四个例子的GIV工具包中，我们补充了冰川学领域的运动（冰川佩里托莫雷诺，阿根廷）和计算速度场的小中纬度（冰川d'Albertiere，法国）和热带冰川（火山钦博拉索，厄瓜多尔），以及非常大的冰川（瓦维洛夫冰帽，俄罗斯）。完整注释的MATLAB代码和GIV的独立应用程序可从GitHub和Zenodo获得（参见https：//doi.org/10.5281/zenodo.4624831，货车Wyk de弗里斯，2021 a）。
We present Glacier Image Velocimetry (GIV), an open-source and easy-to-use software toolkit for rapidly calculating high-spatial-resolution glacier velocity fields. Glacier ice velocity fields reveal flow dynamics, ice-flux changes, and (with additional data and modelling) ice thickness. Obtaining glacier velocity measurements over wide areas with field techniques is labour intensive and often associated with safety risks. The recent increased availability of high-resolution, short-repeat-time optical imagery allows us to obtain ice displacement fields using "feature tracking" based on matching persistent irregularities on the ice surface between images and hence, surface velocity over time. GIV is fully parallelized and automatically detects, filters, and extracts velocities from large datasets of images. Through this coupled toolchain and an easy-to-use GUI, GIV can rapidly analyse hundreds to thousands of image pairs on a laptop or desktop computer. We present four example applications of the GIV toolkit in which we complement a glaciology field campaign (Glaciar Perito Moreno, Argentina) and calculate the velocity fields of small mid-latitude (Glacier d'Argentiere, France) and tropical glaciers (Volcan Chimborazo, Ecuador), as well as very large glaciers (Vavilov Ice Cap, Russia). Fully commented MATLAB code and a standalone app for GIV are available from GitHub and Zenodo (see https://doi.org/10.5281/zenodo.4624831, Van Wyk de Vries, 2021a).