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| Cosenza,Diogo Nepomuceno; Soares,Vicente Paulo; Leite,Helio Garcia; Gleriani,José Marinaldo; Amaral,Cibele Hummel do; Gripp Júnior,Joel; Silva,Antonilmar Araújo Lopes da; Soares,Paula; Tomé,Margarida. |
| Abstract: 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest measurement; Laser scanners; LiDAR. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201373 |
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| Silva,André Gracioso Peres; Görgens,Eric Bastos; Campoe,Otávio Camargo; Alvares,Clayton Alcarde; Stape,José Luiz; Rodriguez,Luiz Carlos Estraviz. |
| This study aimed to map the stem biomass of an even-aged eucalyptus plantation in southeastern Brazil based on canopy height profile (CHPs) statistics using wall-to-wall discrete return airborne laser scanning (ALS), and compare the results with alternative maps generated by ordinary kriging interpolation from field-derived measurements. The assessment of stem biomass with ALS data was carried out using regression analysis methods. Initially, CHPs were determined to express the distribution of laser point heights in the ALS cloud for each sample plot. The probability density function (pdf) used was the Weibull distribution, with two parameters that in a secondary task, were used as explanatory variables to model stem biomass. ALS metrics such as height... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: LiDAR; Basal area; Biometric model; Forest inventory; Fast-growing plantations. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600504 |
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| Oliveira,Luciano Teixeira de; Ferreira,Maria Zélia; Carvalho,Luis Marcelo Tavares de; Ferraz Filho,Antônio Carlos; Oliveira,Thomaz Chaves de Andrade; Silveira,Eduarda Martiniano de Oliveira; Junior,Fausto Weimar Acerbi. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Inventário florestal; LiDAR; Modelos biométricos; Sensoriamento remoto.. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000900692 |
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| Ortíz Reyes, Alma Delia. |
| La técnica más común para estimar variables dasométricas a escalas grandes o pequeñas son los inventarios forestales que se basan en un muestreo en campo. En la actualidad la teledetección ofrece un abanico de posibilidades para contrubuir a esa tarea, tal es el caso de los datos LiDAR (Light Detection And Ranging) que permiten obtener una nube de puntos georreferenciados que dibuja tridimensionalmente el bosque. En este trabajo se estudió la relación entre datos derivados de LiDAR y datos medidos en campo para estimar variables dasométricas como: área basal (AB), biomasa total (BT), cobertura arbórea (COB) y volumen (VOL), mediante cuatro métodos: 1) regresión lineal múltiple, 2) regresión no lineal, 3) estimadores de razón y regresión e 4) inventario... |
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Palavras-chave: Inventario forestal; LiDAR; FUSION; Biomasa total; Volumen; Forest inventory; Total biomass; Volume; Forestal; Maestría. |
| Ano: 2014 |
URL: http://hdl.handle.net/10521/2272 |
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| Melo,Alessandra Morais; Reis,Cristiano Rodrigues; Martins,Bruno Ferraz; Penido,Tamires Mousslech Andrade; Rodriguez,Luiz Carlos Estraviz; Gorgens,Eric Bastos. |
| ABSTRACT In eucalyptus plantations, the presence of understory increases the risk of fires, acts as an obstacle to forest operations, and leads to yield losses due to competition. The objective of this study was to develop an approach to discriminate the presence or absence of understory in eucalyptus plantations based on airborne laser scanning surveys. The bimodal canopy height profile was modeled by two Weibull density functions: one to model the canopy, and other to model the understory. The parameters used as predictor in the logistic model successfully discriminated the presence or absence of understory. The logistic model composed by ℽ canopy, ℽ understory, and ℽ understory showed higher values of accuracy (0.96) and kappa (0.92), which means an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: LiDAR; Remote sensing; Weed control; Understory vegetation. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101001 |
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| Garzon-lopez, Carol X.; Hattab, Tarek; Skowronek, Sandra; Aerts, Raf; Ewald, Michael; Feilhauer, Hannes; Honnay, Olivier; Decocq, Guillaume; Van De Kerchove, Ruben; Somers, Ben; Schmidtlein, Sebastian; Rocchini, Duccio; Lenoir, Jonathan. |
| The synergies between remote sensing technologies and ecological research have opened new avenues for the study of alien plant invasions worldwide. Such scientific advances have greatly improved our capacity to issue warnings, develop early-response systems and assess the impacts of alien plant invasions on biodiversity and ecosystem functioning. Hitherto, practical applications of remote sensing approaches to support nature conservation actions are lagging far behind scientific advances. Yet, for some of these technologies, knowledge transfer is difficult due to the complexity of the different data handling procedures and the huge amounts of data it involves per spatial unit. In this context, the next logical step is to develop clear guidelines for the... |
| Tipo: Text |
Palavras-chave: Biological invasions; Ecosystem impact; Hyperspectral images; LiDAR; Species detection and mapping; Species distribution models. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00435/54645/56071.pdf |
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