LiDAR: princípios e aplicações florestais

Giongo, Marcos; Koehler, Henrique Soares; Machado, Sebastião do Amaral; Kirchner, Flávio Felipe; Marchetti, Marco

doi:10.4336/2010.pfb.30.63.231

Cited by 15 publications

(16 citation statements)

References 30 publications

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“…Studies involving forest airborne laser scanning (ALS) have increased in recent decades due to their potential to extract information on terrain and biomass (Giongo et al, 2010). However, despite being an advanced technology, errors or bias in estimates are often reported and there is no consensus as to the best methodology to be employed when using ALS data.…”

Section: Introductionmentioning

confidence: 99%

Airborne laser scanning applied to eucalyptus stand inventory at individual tree level

Cosenza

Soares

Leite

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to evaluate the application of airborne laser scanning (ALS) to a large-scale eucalyptus stand inventory by the method of individual trees, as well as to propose a new method to estimate tree diameter as a function of the height obtained from point clouds. The study was carried out in a forest area of 1,681 ha, consisting of eight eucalyptus stands with ages varying from four to seven years. After scanning, tree heights were obtained using the local maxima algorithm, and total wood stock by summing up individual volumes. To determine tree diameters, regressions fit using data measured in the inventory plots were used. The results were compared with the estimates obtained from field sampling. The equation system proposed is adequate to be applied to the tree height data derived from ALS point clouds. The tree individualization approach by local maxima filters is efficient to estimate number of trees and wood stock from ALS data, as long as the results are previously calibrated with field data.

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Section: Introductionmentioning

confidence: 99%

Airborne laser scanning applied to eucalyptus stand inventory at individual tree level

Cosenza

Soares

Leite

et al. 2018

Pesq. agropec. bras.

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“…Atualmente, o LiDAR tem uma gama de aplicações em diversas áreas, como arqueologia (Harmon et al, 2006), planejamento costeiro, avaliação de risco de inundações, telecomunicações, redes de transmissão de energia, florestas, agricultura, petróleo, transportes, planejamento urbano e mineração, entre outras (Giongo et al, 2010). No Brasil, no entanto, a linha de pesquisa com o equipamento ainda é incipiente, com destaque para os trabalhos de Castro & Centeno (2005), Castro (2006), Zandoná et al (2008), Macedo (2009, Zonete (2009) e Zonete et al (2010.…”

Section: Introductionunclassified

Determinação do volume de madeira em povoamento de eucalipto por escâner a laser aerotransportado

Oliveira

Ferreira²,

Carvalho

et al. 2014

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a possibilidade de se estimar o diâmetro à altura do peito (DAP) com os dados de altura e de número de árvores derivados do escâner a laser aerotransportado (LiDAR, "light detection and ranging"), e determinar o volume de madeira de talhão de Eucalyptus sp. a partir dessas variáveis. O número total de árvores detectadas foi obtido com uso da filtragem de máxima local. A altura de plantas estimada pelo LiDAR apresentou tendência não significativa à subestimativa. A estimativa do DAP foi coerente com os valores encontrados no inventário florestal; porém, também mostrou tendência à subestimativa, em razão do comportamento observado quanto à altura. A variável número de fustes apresentou valores próximos aos observados nas parcelas do inventário. O LiDAR subestimou o volume total de madeira do talhão em 11,4%, em comparação ao volume posto na fábrica. A tendência de subestimação da altura das árvores (em média, cerca de 5%) impactou a estimativa do volume individual de árvores e, consequentemente, a do volume do talhão. No entanto, é possível gerar equações de regressão que estimam o DAP com boa precisão, a partir de dados de altura de plantas obtidos pelo LiDAR. O modelo parabólico é o que possibilita as melhores estimativas da produção volumétrica dos talhões de eucalipto.Termos para indexação: Eucalyptus, inventário florestal, LiDAR, modelos biométricos, sensoriamento remoto. Determining timber volume of eucalyptus stands by airborne laser scanningAbstract -The objective of this work was to evaluate the possibility of estimating the diameter at breast height (DBH) with tree height and number data derived from airborne laser scanning (LiDAR, light detection and ranging) dataset, and to determine the timber volume of an Eucalyptus sp. stand from these variables. The total number of detected trees was obtained using a local maxima filtering. Plant height estimated by LiDAR showed a nonsignificant tendency to underestimation. The estimate for DBH was coherent with the results found in the forest inventory; however, it also showed a tendency towards underestimation due to the observed behavior for height. The variable number of stems showed values close to the ones observed in the inventory plots. LiDAR underestimated the total timber volume in the stand in 11.4%, compared to the total volume delivered to the industry. The underestimation tendency of tree height (5% mean value) impacted the individual tree volume estimate and, consequently, the stand volume estimate. However, it is possible to obtain regression equations that estimate DBH with good precision, from the LiDAR plant height derived data. The parabolic model is the one that provides the best estimates for timber volumetric yield of eucalyptus stands.

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“…There are still few studies that approach three-dimensional studies applied to urban vegetation cover, especially using LiDAR (Light Detection and Ranging) associated with the NDVI (Normalized Difference Vegetation Index), in order to support the comparison between built and vegetation volumes to evaluate urban environmental quality [1,22,23].…”

Section: Introductionmentioning

confidence: 99%

ESDA (Exploratory Spatial Data Analysis) of Vegetation Cover in Urban Areas—Recognition of Vulnerabilities for the Management of Resources in Urban Green Infrastructure

Moura

Fonseca

2020

Sustainability

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From the mapping of urban vegetation cover by high-resolution orthoimages, using IR band and NDVI classification (Normalized Difference Vegetation Index), added to three-dimensional representation obtained by LiDAR capture (Light Detection and Ranging), the volumetric values of vegetal cover are obtained as a base to construct spatial analysis in the district of Pampulha, in Belo Horizonte, investigating the role it plays in the neighborhood. The article aims to analyze the relationship between vegetation cover, income distribution and population density, as a support to urban environmental quality management. It applies Exploratory Spatial Data Analysis (ESDA) to identify the presence of clusters and patterns of spatial distribution and to examine spatial autocorrelation. The results confirm the concentration of vegetation cover in areas of high income and lower population density but the main contribution of the study is the use of a method to analyze the spatial behavior of this distribution. Calculating Moran global index and local index (LISA), these spatial combinations are mainly used to identify transformation pressures, which may result in the definition of priorities for public actions and the construction of proposals for parameterization of vegetation cover to support plans related to green infrastructure in urban areas.

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LiDAR: princípios e aplicações florestais

Cited by 15 publications

References 30 publications

Airborne laser scanning applied to eucalyptus stand inventory at individual tree level

Airborne laser scanning applied to eucalyptus stand inventory at individual tree level

Determinação do volume de madeira em povoamento de eucalipto por escâner a laser aerotransportado

ESDA (Exploratory Spatial Data Analysis) of Vegetation Cover in Urban Areas—Recognition of Vulnerabilities for the Management of Resources in Urban Green Infrastructure

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