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Registros recuperados: 9
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Airborne laser scanning applied to eucalyptus stand inventory at individual tree level PAB
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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Assessing biomass based on canopy height profiles using airborne laser scanning data in eucalypt plantations Scientia Agricola
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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Assessing understory development in forest plantations using laser imaging detection and ranging (LiDAR) RChHN
HERNÁNDEZ,JAIME; ACUÑA,M. PAZ; CORVALÁN,PATRICIO; SIMONETTI,JAVIER A.
Forestry plantations are expected to be managed in ways to conserve biodiversity while producing goods and services. This goal implies a significant challenge as plantations tend to reduce species richness. The presence of well developed understory enhances the value of plantations as habitat for native fauna. Here, we develop a straightforward method to assess the availability of understory in forestry stands using laser imaging detection and ranging (LiDAR) data and aerial RGB high resolution images. Based on field and airborne acquired data for Pinus radiata stands in central Chile, the digital crown model (DCM), derived from the subtraction of the digital terrain model (DTM) from the digital surface model (DSM) is a more reliable predictor of...
Tipo: Journal article Palavras-chave: Forestry plantations; Kriging; LiDAR; Pinus radiata; Understory height.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400005
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Determinação do volume de madeira em povoamento de eucalipto por escâner a laser aerotransportado PAB
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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Estimación de variables dasométricas mediante tecnología LiDAR. Colegio de Postgraduados
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...
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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Evaluating clustering methods on topographic and hidrological features on lidar data at forest environment. Repositório Alice
RODRIGUES, D. A.; VENDRUSCULO, L. G.; ZOLIN, C. A.; LOPES, T. R..
The acquisition of high resolution geographic data through laser technology has recently being expanded due to the development of LiDAR (Light Detection and Ranging) system. This technology?s growth is relying on its great ability to acquire information in large quantity and short time. The geographic data provided from laser scanning is capable of raising information for coast planning, assess flooding risk, power transmission network and telecommunication, forests, agriculture, oil, transportation, urban planning, mining, among others (GIONGO et al., 2010). LiDAR technology follows the same principles as the RADAR system, with the difference of using laser pulses to locate features, instead of radio waves. Not only for its ability to deal with large...
Tipo: Parte de livro Palavras-chave: Raising information; Flooding risk; LiDAR.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1065633
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Monitoring the understory in eucalyptus plantations using airborne laser scanning Scientia Agricola
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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The DIARS toolbox: a spatially explicit approach to monitor alien plant invasions through remote sensing ArchiMer
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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Using airborne laser altimetry to estimate Sabellaria alveolata (Polychaeta: Sabellariidae) reefs volume in tidal flat environments ArchiMer
Noernberg, Mauricio Almeida; Fournier, Jerome; Dubois, Stanislas; Populus, Jacques.
This study has exploited aerial photographs and LiDAR digital elevation model to quantify intertidal complex landforms volume. A first volume estimation of the main sabellariid polychaete reef complex of the Bay of Mont-Saint-Michel - France is presented. The Sabellaria alveolata is an engineering species that heavily modifies its environment. This gregarious tube-building annelid forms dense and solid reefs of bioclastic coarse sand which can reach several km(2). Since 1970 a very strong decline of reefs has been observed. The authorities have curbed fishing activities without any noticeable changes in reef health status. The S. alveolata reef volume is estimated to be 132 048 m(3) (96 301 m(3) for Sainte-Anne reef and 35 747 m(3) for Champeaux reef)....
Tipo: Text Palavras-chave: LiDAR; Volume; Reef-building polychaete; Sabellaria alveolata; Tidal flats; Bay of Mont-Saint-Michel.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12905/9942.pdf
Registros recuperados: 9
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