Fechar
Metadados

@MastersThesis{Macedo:2009:LaAe,
               author = "Macedo, Rodrigo de Campos",
                title = "Estimativa volum{\'e}trica de povoamento clonal de Eucalyptus sp. 
                         atrav{\'e}s de laserscanner aerotransportado",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2009",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2009-02-27",
             keywords = "Invent{\'a}rio florestalk, LiDAR, laserscanner, modelo digital de 
                         eleva{\c{c}}{\~a}o, estrutura florestal, forest inventor, LiDAR, 
                         laserscanner, digital elevation model, forest structure.",
             abstract = "O gerenciamento florestal requer dados dendrom{\'e}tricos e 
                         topogr{\'a}ficos como subs{\'{\i}}dio aos processos de tomada 
                         de decis{\~a}o. Os meios mais utilizados para isto s{\~a}o os 
                         invent{\'a}rios e levantamentos de campo. Com o aprimoramento dos 
                         SIGīs (Sistemas de Informa{\c{c}}{\~o}es Geogr{\'a}ficas) e o 
                         aumento das op{\c{c}}{\~o}es de sensoriamento remoto, tais como 
                         sensores ativos e passivos de alta resolu{\c{c}}{\~a}o espacial, 
                         a demanda pela aquisi{\c{c}}{\~a}o e pelo processamento de dados 
                         dendrom{\'e}tricos e topogr{\'a}ficos, se acentuou. Em meados de 
                         1993, sensores opticamente ativos, conhecidos como laserscanners 
                         come{\c{c}}aram a ser utilizados especificamente no meio 
                         florestal, visando modelar o terreno e estimar vari{\'a}veis 
                         dendrom{\'e}tricas, como a altura dos povoamentos e, mais 
                         recentemente, a quantidade de indiv{\'{\i}}duos arb{\'o}reos, a 
                         {\'a}rea de copa e o volume madeireiro, principalmente 
                         atrav{\'e}s da segmenta{\c{c}}{\~a}o do dossel florestal. A 
                         hip{\'o}tese {\'e} que a estimativa volum{\'e}trica realizada 
                         com dados obtidos via laserscanner aerotransportado {\'e} 
                         compat{\'{\i}}vel com a estimativa proveniente do 
                         invent{\'a}rio florestal tradicional. O objetivo principal {\'e} 
                         avaliar o potencial da utiliza{\c{c}}{\~a}o de laserscanner 
                         aerotransportado para estimativa volum{\'e}trica de povoamentos 
                         clonais de Eucalyptus sp., em fazendas localizadas em relevo 
                         ondulado. Foram sobrevoados 1.554,7 ha em 6 fazendas utilizadas 
                         para plantio de Eucaliptos. Dentre as fazendas sobrevoadas, 
                         elegeu-se uma F154-Rosa Helena para registrar neste documento e 
                         realizar as valida{\c{c}}{\~o}es necess{\'a}rias. Localiza-se 
                         no munic{\'{\i}}pio de Igarat{\'a}/SP e possui 145,46ha de 
                         plantio efetivo com 4 anos de idade. Como sensor, foi utilizado o 
                         Optech ALTM 2050, com v{\^o}o de 1.000m de altura, footprint de 
                         0,25m. A precis{\~a}o posicional final de 0,12m nas coordenadas X 
                         e Y e 0,21m em Z, compat{\'{\i}}veis com as 
                         caracter{\'{\i}}sticas dos produtos validados. A 
                         diferen{\c{c}}a entre as cotas registradas no Modelo Digital de 
                         Terreno e mensuradas em campo foi de 0,44m. O erro 
                         altim{\'e}trico nominal de um aerolevantamento LiDAR de 1.000m de 
                         altura {\'e} de 0,15m para locais sem cobertura vegetal. 
                         Considerando que n{\~a}o houve presen{\c{c}}a de 
                         vegeta{\c{c}}{\~a}o herb{\'a}cea e n{\~a}o houve 
                         diferencia{\c{c}}{\~a}o entre os RMSīs obtidos nos perfis com e 
                         sem cobertura, em n{\'{\i}}vel ou em desn{\'{\i}}vel, o 
                         detalhamento presente no micro-relevo ocasiona o erro posicional 
                         planim{\'e}trico, que por sua vez, influencia na medida 
                         altim{\'e}trica. De acordo com as compara{\c{c}}{\~o}es 
                         realizadas, os modelos gerados podem ser utilizados para a 
                         obten{\c{c}}{\~a}o de vari{\'a}veis dendrom{\'e}tricas, 
                         requisitos para a modelagem volum{\'e}trica. Implementou-se um 
                         algoritmo de extra{\c{c}}{\~a}o de vari{\'a}veis 
                         dendrom{\'e}tricas e, considerando todas as parcelas medidas em 
                         campo, atingiu-se um percentual de erro de -3,52% para quantidade 
                         de {\'a}rvores, -2,26% para altura, 19,36% para {\'a}rea de 
                         copa, 5,33% para DAP e -1,8% para volume. A partir da an{\'a}lise 
                         dos dados foi poss{\'{\i}}vel verificar que apesar do algoritmo 
                         subestimar a quantidade de {\'a}rvores e a altura, e superestimar 
                         a {\'a}rea de copa e o DAP, a estimativa volum{\'e}trica 
                         manteve-se dentro de um intervalo aceit{\'a}vel, tanto em termos 
                         de intervalo de confian{\c{c}}a, quanto em erro amostral. Diante 
                         dos resultados obtidos, aceita-se a hip{\'o}tese inicial, ou 
                         seja, a estimativa volum{\'e}trica realizada com dados obtidos 
                         via laserscanner aerotransportado {\'e} compat{\'{\i}}vel com a 
                         estimativa proveniente do invent{\'a}rio florestal tradicional. 
                         ABSTRACT: Forest management activities usually rely on 
                         dendrometric and topographic data as a means to support their 
                         decision making processes. For this end, forest inventory and 
                         topographic survey are commonly used. The recent advances in GIS 
                         and the improvements in the spatial resolution of remote sensing 
                         systems, both passive and active ones, largely increased the 
                         demand for the acquisition and processing of dendrometric and 
                         topographic data. Since 1993, optical active sensors \− 
                         known as laserscanners \− started to be specifically used 
                         in forest applications for ground modeling and dendrometric 
                         parameters estimates, e.g. tree height, and more recently, 
                         quantity of trees, crown area, and wood volume, mainly in the 
                         segmentation process of the forest canopy. The core hypothesis of 
                         this research is that the volumetric estimate carried out with 
                         LiDAR data is compatible with estimates of traditional forest 
                         inventory techniques (based on ground data). The main objective is 
                         then to evaluate the potential of using airborne laserscanner for 
                         volumetric estimate of clonal plantation of Eucalyptus sp., found 
                         in steep slope regions. Six farms were select for this study, of 
                         which a total area of 1,554.7 ha was sampled. One farm F154-Rosa 
                         Helena was chosen for detailed records and validation. Such farm 
                         is located in the municipality of Igarat{\'a} (Sao Paulo State) 
                         and owns a four-year old plantation, distributed over an effective 
                         area of 145.46 ha. The Optech ALTM 2050 has been employed, with a 
                         0.25 m footprint, acquired by an average flight height of 1,000 m. 
                         Its planimetric positional accuracy was 0.12 m (X, Y) and the 
                         elevation positional accuracy was 0.21 m (Z). The difference 
                         between the elevations of the Digital Terrain Model and the ones 
                         obtained by field measurements was of 0.44 m. The nominal 
                         elevation error of an airborne LiDAR (with a flight height of 
                         1,000m) is 0.15 m in the case of areas with no vegetation cover. 
                         Considering that the study area did not present herbaceous 
                         vegetation and that no meaningful difference was observed between 
                         the root mean square errors of profiles with and without 
                         vegetation cover (both on flat and uneven terrains), it can be 
                         stated that the details found in the micro-relief of the study 
                         area are to a large extent responsible for the impact of the 
                         planimetric errors in the elevation measurements. In general, the 
                         maximum height values of the Digital Height Model were smaller 
                         than those of the ground data. The generated models can be used 
                         for the extraction of dendrometric parameters, necessary for 
                         volumetric modeling. A special algorithm for the extraction of 
                         dendrometric parameters was implemented using the IDL environment. 
                         Considering all plots regarded in this analysis, the error share 
                         was 3.52% for the total number of trees; 2.26% for tree height; 
                         19.36% for crown area; 5.33% for Diameter Breast Height (DBH), and 
                         98.2% for volume. The algorithm underestimated the number of trees 
                         and their height and overestimated the crown area and DBH. The 
                         volumetric estimate is though acceptable. The core hypothesis of 
                         this research is thus accepted; since the volumetric estimate 
                         executed with airborne laserscanner data is compatible with 
                         estimates derived from the use of traditional forest inventory 
                         techniques.",
            committee = "Soares, Jo{\~a}o Vianei (presidente/orientador) and Santos, 
                         Jo{\~a}o Roberto dos (orientador) and Ponzoni, Fl{\'a}vio Jorge 
                         and Mitishita, Edson Aparecido",
           copyholder = "SID/SCD",
         englishtitle = "Volumetric estimate of Eucalyptus sp. clonal plantation using 
                         airborne laserscanner",
             language = "pt",
                pages = "143",
                  ibi = "8JMKD3MGP8W/34NUA58",
                  url = "http://urlib.net/rep/8JMKD3MGP8W/34NUA58",
           targetfile = "publicacao.pdf",
        urlaccessdate = "04 ago. 2020"
}


Fechar