Glacier motion estimation using SAR offset-tracking procedures
Glacier motion estimation using SAR offset-tracking procedures
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DOI：
10.1109/tgrs.2002.805079
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发表时间：
2002-11-01
影响因子：
8.2
通讯作者：
Werner, CL
中科院分区：
文献类型：
--
作者：
Strozzi, T;Luckman, A;Werner, CL
讨论了两种用于估计卫星合成孔径雷达(SAR)图像间特征运动的像-像贴片偏移技术。基于斑块强度互相关优化的强度跟踪和基于斑块相干性优化的相干跟踪被用于估计两幅SAR图像之间冰川表面在倾斜方向和方位方向上的运动。以1992年至1996年斯瓦尔巴群岛北部莫纳科布林涌潮为例，检验了这两种方法的精度和适用范围。当差分干涉法受到相干性损失的限制时，即在两幅SAR图像之间的快速非相干流动和大的采集时间间隔的情况下，SAR图像的偏移跟踪过程是一种替代差分SAR干涉法来估计冰川运动的方法。此外，当只有一种轨道构型的SAR数据可用时，可以将方位方向上的偏移跟踪过程与倾斜方向上的差分SAR干涉测量相结合，以便恢复二维位移图。
Two image-to-image patch offset techniques for estimating feature motion between satellite synthetic aperture radar (SAR) images are discussed. Intensity tracking, based on patch intensity cross-correlation optimization, and coherence tracking, based on patch coherence optimization, are used to estimate the movement of glacier surfaces between two SAR images in both slant-range and azimuth direction. The accuracy and application range of the two methods are examined in the case of the surge of Monacobreen in Northern Svalbard between 1992 and 1996. Offset-tracking procedures of SAR images are an alternative to differential SAR interferometry for the estimation of glacier motion when differential SAR interferometry is limited by loss of coherence, i.e., in the case of rapid and incoherent flow and of large acquisition time intervals between the two SAR images. In addition, an offset-tracking procedure in the azimuth direction may be combined with differential SAR interferometry in the slant-range direction in order to retrieve a two-dimensional displacement map when SAR data of only one orbit configuration are available.