Individual tree biomass estimation using terrestrial laser scanning
Individual tree biomass estimation using terrestrial laser scanning
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DOI：
10.1016/j.isprsjprs.2012.10.003
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发表时间：
2013-01-01
影响因子：
12.7
通讯作者：
Alho, Petteri
中科院分区：
文献类型：
--
作者：
Kankare, Ville;Holopainen, Markus;Alho, Petteri
茎和树冠生物量的测定需要对单个树的茎、树皮、树枝和针叶进行精确的测量。这些测量非常耗时，特别是对于成熟的树木。精确的野外测量只能用破坏性的方法来完成。地面激光扫描（TLS）测量是测量所需参考信息的可行选择。TLS测量提供密集的点云，其中描述生物量的特征可以提取为茎形和冠层尺寸。现有的生物量模型没有利用冠层大小信息，因此基于tls的估算方法可以提高生物量估算的准确性。本研究的主要目的是基于利用TLS数据建立的模型估算单树水平地上生物量（AGB）。建模数据集包括64棵实验室测量的树木。建立了总AGB、树干生物量、活枝生物量和死枝生物量模型。将模拟结果与现有的单树水平生物量模型进行了比较，结果表明，与现有模型相比，AGB估算精度有所提高。然而，目前基于胸径高度（DBH）、树高和物种的生物量模型对茎和总生物量的计算效果相当好。基于tls的模型提高了估算精度，特别是对树枝生物量的估算。我们建议使用来自TLS数据的茎曲线和树冠大小几何测量作为异速生物量模型的基础，而不是统计三维点度量，因为TLS统计度量依赖于各种扫描参数和树木邻近特征。(c) 2012 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS) by Elsevier B.V.版权所有。
Determination of stem and crown biomass requires accurate measurements of individual tree stem, bark, branch and needles. These measurements are time-consuming especially for mature trees. Accurate field measurements can be done only in a destructive manner. Terrestrial laser scanning (TLS) measurements are a viable option for measuring the reference information needed. TLS measurements provide dense point clouds in which features describing biomass can be extracted for stem form and canopy dimensions. Existing biomass models do not utilise canopy size information and therefore TLS-based estimation methods should improve the accuracy of biomass estimation. The main objective of this study was to estimate single-tree-level aboveground biomass (AGB), based on models developed using TLS data. The modelling dataset included 64 laboratory-measured trees. Models were developed for total AGB, tree stem-, living branch- and dead branch biomass. Modelling results were also compared with existing individual tree-level biomass models and showed that AGB estimation accuracies were improved, compared with those of existing models. However, current biomass models based on diameter-at-breast height (DBH), tree height and species worked rather well for stem- and total biomass. TLS-based models improved estimation accuracies, especially estimation of branch biomass. We suggest the use of stem curve and crown size geometric measurements from TLS data as a basis for allometric biomass models rather than statistical three-dimensional point metrics, since TLS statistical metrics are dependent on various scanning parameters and tree neighbourhood characteristics. (c) 2012 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS) Published by Elsevier B.V. All rights reserved.