Different methodologies for calculating crown volumes of Platanus hispanica trees using terrestrial laser scanner and a comparison with classical dendrometric measurements

Fernández-Sarría, Alfonso; Martínez, Laura Marqués; Velázquez‐Martí, Borja; Sajdak, Marcin; Estornell, Javier; Recio, J. A.

doi:10.1016/j.compag.2012.09.017

Cited by 70 publications

(61 citation statements)

References 36 publications

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“…Any method that could advance our understanding of these dynamics has to be applied in complex forest environments. However, studies analyzing crown characteristics of individual trees often used noninteracting trees (no crown overlap) or examples from outside forests (e.g., Fernández‐Sarría et al., 2013; Moorthy et al., 2011). Furthermore, not only the spatial constellation of neighboring trees but also the temporal dynamics of individual tree crown structure and canopy space filling are important aspects in forest research.…”

Section: Discussionmentioning

confidence: 99%

“…By making use of the TLS data for the crown modeling, there is no need to take a geometric shape as a basis (such as cone, paraboloid, and hemisphere; Fernández‐Sarría et al., 2013). To the contrary, the strong crown plasticity of individual trees becomes apparent (Figure 4).…”

Section: Discussionmentioning

confidence: 99%

“…However, similar to the α‐value, the voxel size has to be chosen with care as it can have a significant effect on the measured property, in particular when computing volumes. With respect to tree crowns, voxel grids have been used to compute leaf area index and foliage (Béland, Widlowski, Fournier, Côté, & Verstraete, 2011), crown plasticity (Seidel, Leuschner, Müller, & Krause, 2011), crown competition (Metz et al., 2013), and CVs (Fernández‐Sarría et al., 2013; Metz et al., 2013). Often, α‐shape and voxel grid approaches are used in combination (Fernández‐Sarría et al., 2013; Metz et al., 2013; Seidel et al., 2011), mainly because they enable faster point cloud processing and simplification.…”

Section: Introductionmentioning

confidence: 99%

“…Studies with multitemporal point cloud data from forests are rare and mainly focused on estimating changes in diameter at breast height or aboveground biomass of individual trees (Liang, Hyyppä, Kaartinen, Holopainen, & Melkas, 2012; Srinivasan, Popescu, Eriksson, Sheridan, & Ku, 2014). In addition, some studies used noninteracting trees (no crown overlap) and no real forest examples (e.g., Fernández‐Sarría et al., 2013; Moorthy et al., 2011). However, the interaction of tree crowns and the temporal development and outcome of this competition for canopy space are of particular interest in forest ecology (Pretzsch, 2014).…”

Section: Introductionmentioning

confidence: 99%

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A high‐resolution approach for the spatiotemporal analysis of forest canopy space using terrestrial laser scanning data

Hess

Härdtle

Kunz

et al. 2018

Ecology and Evolution

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Forest canopies and tree crown structures are of high ecological importance. Measuring canopies and crowns by direct inventory methods is time‐consuming and of limited accuracy. High‐resolution inventory tools, in particular terrestrial laser scanning (TLS), is able to overcome these limitations and obtain three‐dimensional (3D) structural information about the canopy with a very high level of detail. The main objective of this study was to introduce a novel method to analyze spatiotemporal dynamics in canopy occupancy at the individual tree and local neighborhood level using high‐resolution 3D TLS data. For the analyses, a voxel grid approach was applied. The tree crowns were modeled through the combination of two approaches: the encasement of all crown points with a 3D α‐shape, which was then converted into a voxel grid, and the direct voxelization of the crown points. We show that canopy occupancy at individual tree level can be quantified as the crown volume occupied only by the respective tree or shared with neighboring trees. At the local neighborhood level, our method enables the precise determination of the extent of canopy space filling, the identification of tree–tree interactions, and the analysis of complementary space use. Using multitemporal TLS data recordings, this method allows the precise detection and quantification of changes in canopy occupancy through time. The method is applicable to a wide range of investigations in forest ecology research, including the study of tree diversity effects on forest productivity or growing space analyses for optimal tree growth. Due to the high accuracy of this novel method, it facilitates the precise analyses even of highly plastic individual tree crowns and, thus, the realistic representation of forest canopies. Moreover, our voxel grid framework is flexible enough to allow for the inclusion of further biotic and abiotic variables relevant to complex analyses of forest canopy dynamics.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A high‐resolution approach for the spatiotemporal analysis of forest canopy space using terrestrial laser scanning data

Hess

Härdtle

Kunz

et al. 2018

Ecology and Evolution

View full text Add to dashboard Cite

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“…However, major part of studies have been focusing on modeling crown variables other than crown volume. Even though several crown volume studies were carried out, most kept estimating crown volume based on cones volume, cylinders, paraboloids, ellipsoids, hemispheres, or spheres (Villacorta et al, 2015;Fernández-Sarría et al, 2013;Leites et al, 2013;Velázquez-Martí et al, 2012;Pérez-Cruzado and Rodríguez-Soalleiro, 2011;Roberts et al, 2003;Montgomery and Chazdon, 2000;Van Pelt and North, 1996;Jack and Long, 1992;McPherson and Rowntree, 1988;Kuuluvainen, 1988).…”

Section: Introductionmentioning

confidence: 99%

Analytical approaches for modeling tree crown volume in black wattle (Acacia mearnsii De Wild.) stands

Guilherme¹,

Carlos²,

Sylvio³

et al. 2016

Afr. J. Agric. Res.

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In this paper, four strategies were proposed for modeling tree crown volume using as independent variable stem variables, crown variables, combination of stem and crown variables, and stem volume. We used a dataset comprised of 170 trees from 12 temporary plots located in forest stands in southern Brazil. Models composed of stem variables presented weaker predictive ability. The best model contained crown variables, which explained 78.95% of observed variability. However, implementation of such model is bounded by its independent variables, which are not often measured in forest inventories. The model composed by diameter at breast height and crown length proved to be an adequate modeling approach. The predictive capability was kept by model , which is composed by most easily measured variable in a forest -diameter at breast height, also by the most easily acquirable crown variable -crown length. In our suggested model, estimates of and are coefficients that convert volume of a regular geometric solid -RGS is dbh² times crown length) -into crown volume, whilst estimate of is an allometric constant.

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Variable rate air‐assisted spray based on real‐time disease spot identification

Zhang

Yin

Zhou

et al. 2022

Pest Management Science

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Background Currently, the variable‐rate application (VA) of agrochemicals on fruit trees is based on canopy volume and biomass. The canopy volume has a significant relationship with disease resistance and degree of disease incidence. Therefore, this study proposes a VA method that uses deep convolutional neural networks for real‐time recognition of disease spots on pear trees. Furthermore, it specifies the limitations and application scenarios of the disease spot recognition. Field performance tests were conducted to verify the performance of the proposed VA system. Results The results showed a mean average precision, precision, and recall of 87.42%, 83.76%, and 87.23%, respectively. The spot recognition rate was 81.3% when the canopy sampling distance, spot diameter, and canopy porosity were 1.2 m, 4–8 mm, and 55.76%, respectively. The results indicate that the proposed VA system saved 51.9% spray volume compared to conventional methods while ensuring quality. Conclusion Compared to the traditional constant rate model, the proposed VA technology based on real‐time disease spot identification can reduce spraying in nondiseased areas, thereby abandoning the previous saturation application practice and significantly reducing pesticide use. © 2022 Society of Chemical Industry.

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Different methodologies for calculating crown volumes of Platanus hispanica trees using terrestrial laser scanner and a comparison with classical dendrometric measurements

Cited by 70 publications

References 36 publications

A high‐resolution approach for the spatiotemporal analysis of forest canopy space using terrestrial laser scanning data

A high‐resolution approach for the spatiotemporal analysis of forest canopy space using terrestrial laser scanning data

Analytical approaches for modeling tree crown volume in black wattle (Acacia mearnsii De Wild.) stands

Variable rate air‐assisted spray based on real‐time disease spot identification

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