Linear and nonlinear terrain deformation maps from a reduced set of interferometric SAR images
Linear and nonlinear terrain deformation maps from a reduced set of interferometric SAR images
复制标题
DOI：
10.1109/tgrs.2003.814657
复制
发表时间：
2003-10-01
影响因子：
8.2
通讯作者：
Broquetas, A
中科院分区：
文献类型：
--
作者：
Mora, O;Mallorqui, JJ;Broquetas, A
在本文中，一种先进的技术，用于生成的变形图，使用合成孔径雷达（SAR）数据。该算法估计的线性和非线性分量的位移，数字高程模型（DEM）的错误，用于取消地形条款，和大气文物从一组减少的低空间分辨率干涉图。候选像素是从整个干涉图集中表现出良好相干性的像素中选择的，并且所得到的非均匀网格用Delauney三角剖分镶嵌以在它们之间建立连接。移动和DEM误差的线性分量估计调整线性模型的数据只在连接。稍后，这些信息，一旦展开检索的绝对值，被用来计算的运动和大气伪影的非线性分量与交替滤波技术在时间和空间域。该方法在所需的图像数量和基线长度方面具有很高的灵活性。然而，更好的结果与短基线干涉图的大数据集。该技术已经过测试，欧洲遥感SAR数据从加泰罗尼亚（西班牙）的一个地区，并验证了现场精确的水准测量。
In this paper, an advanced technique for the generation of deformation maps using synthetic aperture radar (SAR) data is presented. The algorithm estimates the linear and nonlinear components of the displacement, the error of the digital elevation model (DEM) used to cancel the topographic terms, and the atmospheric artifacts from a reduced set of low spatial resolution interferograms. The pixel candidates are selected from those presenting a good coherence level in the whole set of interferograms and the resulting nonuniform mesh tessellated with the Delauney triangulation to establish connections among them. The linear component of movement and DEM error are estimated adjusting a linear model to the data only on the connections. Later on, this information, once unwrapped to retrieve the absolute values, is used to calculate the nonlinear component of movement and atmospheric artifacts with alternate filtering techniques in both temporal and spatial domains. The method presents high flexibility with respect the required number of images and the baselines length. However, better results are obtained with large datasets of short baseline interferograms. The technique has been tested with European Remote Sensing SAR data from an area of Catalonia (Spain) and validated with on-field precise leveling measurements.