Application of image cross-correlation to the measurement of glacier velocity using satellite image data
Application of image cross-correlation to the measurement of glacier velocity using satellite image data
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DOI：
10.1016/0034-4257(92)90101-o
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发表时间：
1992-12
影响因子：
13.5
通讯作者：
T. Scambos;M. Dutkiewicz;Jeremy C. Wilson;R. Bindschadler
中科院分区：
文献类型：
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作者：
T. Scambos;M. Dutkiewicz;Jeremy C. Wilson;R. Bindschadler
图像间互相关软件应用于成对的数字卫星图像，以绘制移动冰的速度场。这种技术使用小规模的冰川表面特征，如裂缝疤痕和雪沙丘，作为移动冰表面的标记。通过选择以不同特征为中心的小图像区域，或者通过将大面积的密集特征冰川表面划分为网格区域，并使用互相关算法搜索后续图像以匹配区域，来映射表面特征的位移。峰值相关值的内插允许以亚像素精度测量位移，从而导致非常精确的速度测量。互相关也适用于在没有基岩暴露的地区提供图像配准。在这样的地区，微妙的大规模地形起伏的冰面，相关的基础基岩结构，可以通过使用大的图像区域和低通滤波图像相关。这两种类型的应用程序进行了演示，使用冰流D和冰流E在南极洲西部作为测试区。冰流E的中心部分的速度场的高分辨率地图，所产生的位移测量技术，提出。互相关软件的使用是一个显着的改进，以前的手动为基础的摄影测量方法的速度测量，是远高于在偏远的极地地区的原地方法的成本效益。
Image-to-image cross-correlation software is applied to pairs of digital satellite images to map the velocity field of moving ice. This technique uses small-scale glacial surface features, such as crevasse scars and snow dunes, as markers on the surface of the moving ice. Displacements of the surface features are mapped by selecting small image areas centered on distinct features, or by dividing a large area of densely featured glacial surface into a grid of areas, and searching a subsequent image for matching areas using a cross-correlation algorithm. Interpolation of the peak correlation values allows the displacements to be measured to subpixel accuracy, resulting in very precise velocity measurements. Cross-correlation is also applied to provide image coregistration in areas devoid of bedrock exposures. In such areas, subtle large-scale topographic undulations in the ice surface, related to underlying bedrock structure, may be correlated by using large image areas and low-pass filtered images. Both types of applications are demonstrated, using Ice Stream D and Ice Stream E in West Antarctica as test areas. A high-resolution map of the velocity field of the central portion of Ice Stream E, generated by the displacement-measuring technique, is presented. The use of cross-correlation software is a significant improvement over previous manually-based photogrammetric methods for velocity measurement, and is far more cost-effective than in situ methods in remote polar areas.