SkelTre

Bucksch, Alexander; Lindenbergh, Roderik; Menenti, Massimo

doi:10.1007/s00371-010-0520-4

Cited by 111 publications

(60 citation statements)

References 22 publications

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“…Imperfections of the merged point cloud, caused by remaining registration errors, noise or i.e., moving branches which were influenced by wind, are overcome in most cases because of the digitization method ( Figure 11). This is an advantage compared to voxel methods, which are based on a merged pointcloud e.g., [15,16,18]. One of the big benefits of using single scans and their projections is that the inevitable systematic errors (imperfect registration) and random errors (noise) are an unsolvable problem.…”

Section: Discussionmentioning

confidence: 99%

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A Practical Approach for Extracting Tree Models in Forest Environments Based on Equirectangular Projections of Terrestrial Laser Scans

et al. 2013

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Extracting 3D tree models based on terrestrial laser scanning (TLS) point clouds is a challenging task as trees are complex objects. Current TLS devices acquire high-density data that allow a detailed reconstruction of the tree topology. However, in dense forests a fully automatic reconstruction of trees is often limited by occlusion, wind influences and co-registration issues. In this paper, a semi-automatic method for extracting branching and stem structure based on equirectangular projections (range and intensity maps) is presented. The digitization of branches and stems is based on 2D maps, which enables simple navigation and raster processing. The modeling is performed for each viewpoint individually instead of using a registered point cloud. Previously reconstructed 2D-skeletons are transformed between the maps. Therefore, wind influences, orientation imperfections of scans and data gaps can be overcome. The method is applied to a TLS dataset acquired in a forest in Germany. In total 34 scans were carried out within a managed forest to measure approximately 90 spruce trees with minimal occlusions. The results demonstrate the feasibility of the presented approach to extract tree models with a high completeness and correctness and provide an excellent input for further modeling applications.

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Section: Discussionmentioning

confidence: 99%

“…Based on TLS voxel data, Bucksch [17,18] derives the center of gravity of TLS points within each voxel to finally connect these points to a graph. To ensure that outliers or noise do not alter the graph erroneous voxels are eliminated by applying a robust test.…”

Section: Related Workmentioning

confidence: 99%

A Practical Approach for Extracting Tree Models in Forest Environments Based on Equirectangular Projections of Terrestrial Laser Scans

et al. 2013

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“…A partir da análise de grafos formados pela conectividade das células e de suas principais direções cartesianas, Bucksch et al (2010) propuseram o método SkelTre para reconstrução da árvore em tronco e galhos.…”

Section: Introductionunclassified

Detecção De Árvores Em Nuvens De Pontos De Varredura Laser Terrestre

et al. 2017

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Resumo:A utilização do laser terrestre para levantamentos em povoamentos florestais tem como objetivo prover dados à modelagem tridimensional das árvores, no entanto, para que seja possível aplicar tal modelo, é necessário realizar a detecção dos pontos que fazem parte de árvores na varredura. O presente estudo propõe um método para a detecção de árvores a partir da nuvem de pontos 3D de plantios florestais. Inicialmente, procura-se reconstituir a distribuição espacial das árvores a partir da aplicação de um algoritmo de segmentação em uma seção transversal (1 metro) da nuvem de pontos. Em seguida, é apresentado um algoritmo para detectar a posição das árvores com base no padrão de alinhamento do povoamento. Por fim, os resultados obtidos são apresentados para validação pelo usuário da nuvem de pontos. O método apresentado foi testado em parcelas circulares instaladas em povoamentos de Eucalyptus spp. levantados por varreduras simples e múltiplas. Os resultados apontaram a necessidade de utilização de múltiplas estações de TLS para redução do efeito de sombreamento no levantamento das parcelas circulares. A aplicação do método de detecção de árvores em conjunto com a análise visual resultou na identificação de 100% das árvores a partir das nuvens de pontos das parcelas.Palavras-chave: plantios florestais, varredura simples e múltiplas, parcelas circulares, componentes conectadas, Eucalyptus spp. Abstract:Terrestrial LIDAR measurements in forest stands is often used to gather data for 3D tree models. However, such models require the detection of points representing trees in the scanning field. The present study offers a method for tree detection from a 3D point cloud of forest plantations. Initially the spatial distribution of trees is reconstructed by applying a segmentation algorithm in a transverse slice (1 meter) through the point cloud. This is followed by an algorithm for detecting tree position based on plantation stand row alignment. Finally, the results are presented

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“…Especially, terrestrial laser scanning (TLS) has been demonstrated as a very effective tool in measuring tree/stand properties not directly measurable which are of interest in forest research, such as crown displacement (Seidel et al 2011b), competition among trees (Metz et al 2013), leaf area distributions (Béland et al 2011) or crown volume and surface (Metz et al 2013). Furthermore, a detailed assessment of branch dimensions became possible by means of 3D-TLS (Bucksch et al 2010, Dassot et al 2012). …”

Section: Introductionmentioning

confidence: 99%

Relationship between tree growth and physical dimensions of Fagus sylvatica crowns assessed from terrestrial laser scanning

Seidel¹,

Schall²,

Gille³

et al. 2015

iForest

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, Christian Ammer (2) Measurements of physical tree crown dimensions were of subjective character in the past, even though they can be considered important for the management of many silvicultural operations, such as timing of thinning operations. In our study we investigated if and how measures of physical crown dimensions of trees differed when quantified conventionally versus based on 3D-terrestrial laser scanning and how they are related to basal area increment. Some 24 randomly selected predominant or dominant beech trees between 90 and 110 yrs of age and of varying height were used as study trees. We hypothesized that tree crown dimensions obtained from scans are more closely related to tree radial growth than those obtained from conventional field measurements. It was found that from a variety of compared crown size characteristics the scan-based tree attributes mean crown radius, maximum area of the crown and crown projection area were most closely related to individual tree growth. We conclude that the horizontal extension of a tree crown in general is to be considered one of the most important drivers of tree growth. We also conclude that terrestrial laser scanning is a powerful tool to reliably measure physical crown dimensions and TLS-based measurements are more reliable than conventional ones.

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SkelTre

Cited by 111 publications

References 22 publications

A Practical Approach for Extracting Tree Models in Forest Environments Based on Equirectangular Projections of Terrestrial Laser Scans

A Practical Approach for Extracting Tree Models in Forest Environments Based on Equirectangular Projections of Terrestrial Laser Scans

Detecção De Árvores Em Nuvens De Pontos De Varredura Laser Terrestre

Relationship between tree growth and physical dimensions of Fagus sylvatica crowns assessed from terrestrial laser scanning

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