通过地面激光扫描估算树枝体积的局限性

IF 2.6 2区 农林科学 Q1 FORESTRY European Journal of Forest Research Pub Date : 2024-01-14 DOI:10.1007/s10342-023-01651-z
Christopher Morhart, Zoe Schindler, Julian Frey, Jonathan P. Sheppard, Kim Calders, Mathias Disney, Felix Morsdorf, Pasi Raumonen, Thomas Seifert
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引用次数: 0

摘要

定量结构模型(QSM)常用于简化地面激光扫描(TLS)获得的单棵树木点云。QSM 使用几何基元来推导树木的拓扑和体积信息。以往的研究表明,TLS 和 QSM 对整棵树的总体积估算与实地测量数据具有很高的一致性。虽然 TLS 和 QSM 模型已经得到广泛应用,但两者结合的不确定性在很大程度上仍未得到探讨。在我们的研究中,我们调查了从 TLS 数据推导 QSM 时扫描距离对枝条长度和体积估计值的影响。我们扫描了十根平均长度为 2.6 米的欧洲山毛榉(Fagus sylvatica L.)树枝。作为基准,进行了 12 次近距离扫描。对每个距离和树枝都得出了 QSM。我们发现,随着距离的增加,点云密度和重建分支的累积长度减少,而单个体积增加。根据 QSM 超参数的不同,在扫描距离为 45 米时,树枝累积长度平均被低估了 - 75%,而树枝体积则被高估了 + 539%。我们认为高偏差与点云质量有关。随着扫描距离的增加,单个激光足迹的大小和它们之间的距离也会增加,这就更难完全捕捉到小树枝并调整合适的 QSM。
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Limitations of estimating branch volume from terrestrial laser scanning

Quantitative structural models (QSMs) are frequently used to simplify single tree point clouds obtained by terrestrial laser scanning (TLS). QSMs use geometric primitives to derive topological and volumetric information about trees. Previous studies have shown a high agreement between TLS and QSM total volume estimates alongside field measured data for whole trees. Although already broadly applied, the uncertainties of the combination of TLS and QSM modelling are still largely unexplored. In our study, we investigated the effect of scanning distance on length and volume estimates of branches when deriving QSMs from TLS data. We scanned ten European beech (Fagus sylvatica L.) branches with an average length of 2.6 m. The branches were scanned from distances ranging from 5 to 45 m at step intervals of 5 m from three scan positions each. Twelve close-range scans were performed as a benchmark. For each distance and branch, QSMs were derived. We found that with increasing distance, the point cloud density and the cumulative length of the reconstructed branches decreased, whereas individual volumes increased. Dependent on the QSM hyperparameters, at a scanning distance of 45 m, cumulative branch length was on average underestimated by − 75%, while branch volume was overestimated by up to + 539%. We assume that the high deviations are related to point cloud quality. As the scanning distance increases, the size of the individual laser footprints and the distances between them increase, making it more difficult to fully capture small branches and to adjust suitable QSMs.

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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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