Crevasse and rift detection in Antarctica from TerraSAR-X satellite imagery
Crevasse and rift detection in Antarctica from TerraSAR-X satellite imagery
复制标题
利用 TerraSAR-X 卫星图像检测南极洲的裂缝和裂谷
DOI：
10.1016/j.coldregions.2021.103284
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发表时间：
2021
影响因子：
4.1
通讯作者：
D. Floricioiu
中科院分区：
文献类型：
--
作者：
O. Marsh;Daniel J. Price;Z. Courville;D. Floricioiu
使用有源微波合成孔径雷达，可以远程绘制冰盖和冰川上被雪桥覆盖的表面裂缝的地图。由于雪桥侧壁和底部的散布增加，它们在周围积雪的衬托下突出显示，通常表现为线状特征。裂缝和无裂缝区域的对比度取决于传感器的设计、图像采集参数和雪的性质。在这里，我们量化了裂缝区域如何在X波段表示不同的极化、注视方向和入射角度，并讨论了是否可以从它们的雷达特征中获得关于它们的物理特性的额外信息。雪桥厚度和裂缝宽度是通过探地雷达和挖掘在麦克默多剪切区和布伦特冰架的地面上测量的。TerraSAR-X被证明能够可靠地区分裂缝的位置，平衡对雪的穿透和水平分辨率。我们提供了雷达成像参数的建议，以优化单个裂缝和裂缝区域的识别。
Surface crevasses covered by snow bridges can be mapped remotely on ice sheets and glaciers using active microwave synthetic aperture radar. They are highlighted against the surrounding snow due to increased scattering from the side-walls and base of snow bridges and usually appear as linear features. The contrast between crevasses and crevasse-free regions depends on the design of the sensor, the image acquisition parameters and the properties of the snow. Here we quantify how crevassed regions are represented at X-band for different polarizations, look directions and incidence angles, and discuss whether additional information about their physical properties can be gained from their radar signature. Snow bridge thicknesses and crevasse widths are measured on the ground in the McMurdo Shear Zone and Brunt Ice Shelf by ground-penetrating radar and excavation. TerraSAR-X is shown to reliably distinguish crevasse location, balancing penetration into the snow and horizontal resolution. We provide recommendations for radar imaging parameters that optimize the identification of individual crevasses and crevassed regions.