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首页> 外文期刊>GIScience & remote sensing >Deriving 3D displacement vectors from multi-temporal airborne laser scanning data for landslide activity analyses
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Deriving 3D displacement vectors from multi-temporal airborne laser scanning data for landslide activity analyses

机译：从多时空机载激光扫描数据导出3D位移矢量以进行滑坡活动分析

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摘要

Information on geometries and kinematics of landslides are necessary to establish geological slope deformation models. We present two complementary geospatial methods to analyze landslide surface changes even in areas affected by strong surface pattern changes, making use of airborne laser scanning (ALS) data. An image correlation method based on shaded relief images with a uniformly diffuse lighting and a feature tracking based on terrain breaklines are applied on a data set of eight ALS flight campaigns analyzing an active deep-seated rockslide in the Eastern Alps (Austria). Both tracking methods are described in detail, including parameter assessment. Additionally, an accuracy assessment of the input data sets has been conducted. 3D vector displacement maps derived from image correlation are well suited for the study of landslides if only slight surface pattern changes occur. The smallest detectable displacements strongly depend on the accuracy of the ALS data and for image correlation results lie within the range of 0.24 and 0.75m for this study. Displacement vectors derived by breakline tracking only allow to detect displacements greater than 2m. However, in comparison to image correlation, breakline tracking is not limited to areas with slight surface pattern changes and allows us to detect displacements even in areas with strong surface pattern changes. For a comprehensive interpretation of landslide activity a combination of both methods, with consideration of additional supportive data such as elevation change images and orthoimages, is recommended.
机译：建立滑坡地质模型需要有关滑坡的几何学和运动学的信息。我们提出两种互补的地理空间方法，以利用机载激光扫描（ALS）数据来分析滑坡的表面变化，即使在受强表面样式变化影响的区域中也是如此。一种基于阴影的浮雕图像的图像相关方法，该阴影图像具有均匀的漫射照明和基于地形断裂线的特征跟踪，被应用于八个ALS飞行运动的数据集，用于分析东阿尔卑斯山（奥地利）的活跃深部岩石滑坡。详细介绍了两种跟踪方法，包括参数评估。另外，已经对输入数据集进行了准确性评估。如果仅发生轻微的表面模式变化，则从图像相关性得出的3D矢量位移图非常适合于滑坡研究。最小的可检测位移在很大程度上取决于ALS数据的准确性，对于本研究，图像相关结果位于0.24到0.75m的范围内。通过折线跟踪导出的位移矢量仅允许检测大于2m的位移。但是，与图像相关性相比，折线跟踪不仅限于表面图案变化较小的区域，而且即使在表面图案变化较大的区域中，我们也可以检测到位移。为了对滑坡活动进行全面的解释，建议将两种方法结合使用，并考虑其他支持性数据，例如高程变化图像和正射影像。

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  • 来源
    《GIScience & remote sensing》 |2015年第4期|437-461|共25页
  • 作者

    Fey Christine; Rutzinger Martin; Wichmann Volker; Prager Christoph; Bremer Magnus; Zangerl Christian;

  • 作者单位

    AlpS Ctr Climate Change Adaptat, A-6020 Innsbruck, Austria|TIWAG Tiroler Wasserkraft AG, A-6020 Innsbruck, Austria;

    Austrian Acad Sci, Inst Interdisciplinary Mt Res, ICT, A-6020 Innsbruck, Austria|Univ Innsbruck, Inst Geog, A-6020 Innsbruck, Austria;

    AlpS Ctr Climate Change Adaptat, A-6020 Innsbruck, Austria|LASERDATA GmbH, A-6020 Innsbruck, Austria;

    AlpS Ctr Climate Change Adaptat, A-6020 Innsbruck, Austria|ILF Consulting Engineers, A-6063 Rum, Austria;

    Univ Innsbruck, Inst Geog, A-6020 Innsbruck, Austria;

    Univ Nat Resources & Life Sci Vienna, Inst Appl Geol, A-1190 Vienna, Austria;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    landslides; airborne laser scanning; feature tracking; image correlation;

    机译：滑坡;机载激光扫描;特征跟踪;图像关联;

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