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首页> 外文期刊>International journal of remote sensing >Adaptive local kriging to retrieve slant-range surface motion maps of the Wenchuan earthquake
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Adaptive local kriging to retrieve slant-range surface motion maps of the Wenchuan earthquake

机译:自适应局部克里金法提取汶川地震斜距地表运动图

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摘要

Kriging is a widely used technique for raster data interpolation from point samples, such as in the generation of digital elevation models and geochemical maps. The quality of the result depends on both spatial distribution of the sampled values and nature of the semivariogram model, which fits an empirical global function to the sample data set to predict values at the unknown locations. However, such a semivariogram model may not be suitable for data sets with complex local trends in spatial distribution, such as those observed in differential interferometric synthetic aperture radar (DInSAR) data of the Wenchuan earthquake. Here we propose a modified kriging method, adaptive local kriging (ALK), for the retrieval of data lost through decoherence in Advanced Land Observing Satellite (ALOS) phased array L-band synthetic aperture radar (PALSAR) DInSAR data, within the intensely deformed fault zone of the 2008 Wenchuan earthquake. In ALK, a series of dynamic linear local semivariogram models is used rather than a global semivariogram for the whole data set. The localized adaptive approach ensures accurate interpolation in the areas of good DInSAR data with small decoherence gaps and avoids drastic errors in the extensive decoherence gaps; the overall value prediction is thus significantly improved, as confirmed by comparison with the original DInSAR data and fidelity verification experiments.
机译:克里格(Kriging)是一种广泛用于从点样本进行栅格数据插值的技术,例如在数字高程模型和地球化学地图的生成中。结果的质量取决于采样值的空间分布和半变异函数模型的性质,这使经验全局函数适合于样本数据集以预测未知位置的值。但是,这种半变异函数模型可能不适用于空间分布中具有复杂局部趋势的数据集,例如在汶川地震的差分干涉式合成孔径雷达(DInSAR)数据中观察到的数据集。在这里,我们提出了一种改进的克里金方法,即自适应局部克里金(ALK),用于在严重变形的断层内,通过高级陆地观测卫星(ALOS)相控阵L波段合成孔径雷达(PALSAR)DInSAR数据的去相干性来恢复丢失的数据。 2008年汶川地震灾区。在ALK中,对于整个数据集,使用了一系列动态线性局部半变异函数模型,而不是全局半变异函数模型。局部自适应方法可确保在具有较小相干间隙的良好DInSAR数据区域内进行精确插值,并避免在较大的相干间隙中出现严重误差;与原始DInSAR数据和保真度验证实验相比,可以确认总体价值预测得到了显着改善。

著录项

  • 来源
    《International journal of remote sensing》 |2013年第22期|7589-7606|共18页
  • 作者单位

    Department of Earth Science and Engineering, Imperial College London, London, UK;

    Department of Earth Science and Engineering, Imperial College London, London, UK;

    Department of Earth Science and Engineering, Imperial College London, London, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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