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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Multiscale Geostatistical Estimation of Gravel-Bed Roughness From Terrestrial and Airborne Laser Scanning
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Multiscale Geostatistical Estimation of Gravel-Bed Roughness From Terrestrial and Airborne Laser Scanning

机译：地面和机载激光扫描的砾石层粗糙度多尺度地统计估计

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摘要

The aim of this study is to establish the link between the scaling behavior of gravel-bed roughness of Terrestrial Laser Scanning (TLS) and Airborne Laser Scanning (ALS) data. The fractal dimension calculated from the log-log variogram was used to represent the roughness at two gravel-bed sites with the extent of 6 m $times$ 6 m. In situ digital surface models (DSMs) were generated from TLS. The 3-D point data were collected by ALS, which showed smoothed surfaces of the TLS counterparts. We used the regularization method to derive the variograms of the ALS footprint from the variograms of in situ DSMs and compared it with the variograms of ALS data in the directions of maximum and minimum continuity identified in the 2-D variogram surfaces. Our results confirm that the 2-D variogram surfaces of ALS data show similar anisotropy pattern as their respective TLS-derived DSMs. In addition, we demonstrate that the regularization method is able to establish the scaling relations between TLS-derived DSMs and the ALS data. The results will lead a better understanding of the scaling characteristics of the gravel-bed roughness on the change of measurement scale. To the best of our knowledge, this letter presents the first study of examining the grave-bed roughness of cluster bedforms derived from ALS data.
机译：这项研究的目的是建立地面激光扫描（TLS）和机载激光扫描（ALS）数据在砾石层粗糙度的定标行为之间的联系。由对数-对数变异函数计算出的分形维数用来表示两个砾石床部位的粗糙度，范围为6 m x 6 m。从TLS生成原位数字表面模型（DSM）。通过ALS收集了3-D点数据，该数据显示了TLS对应物的平滑表面。我们使用正则化方法从原位DSM的方差图得出ALS足迹的方差图，并将其与ALS数据的方差图在二维方差图曲面中确定的最大和最小连续性方向上进行比较。我们的结果证实，ALS数据的二维变异函数表面显示出与它们各自的TLS衍生DSM相似的各向异性模式。此外，我们证明了该正则化方法能够建立TLS衍生的DSM与ALS数据之间的比例关系。结果将使人们更好地理解砾石层粗糙度随测量尺度的变化而产生的尺度特征。据我们所知，这封信提出了对检查从ALS数据中得出的簇状床形的坟床粗糙度的第一个研究。

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