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• W1515706937 abstract "Estudar e monitorar a cobertura vegetal são importantes para compreender o padrão climático atual em escala regional e global. Os Modelos de Dinâmica de Vegetação (MDV) são ferramentas úteis nos estudos de determinado bioma, pois são baseados em princípios físicos e em condições iniciais e de contorno, podendo então obter indícios dos fatores que influenciam o ambiente modelado, fazer previsões futuras do comportamento da vegetação e, associados a outros modelos, fazer previsões futuras da influência da vegetação no clima, ou da mudança do clima na vegetação. Em particular, os modelos que simulam a reflectância de um dossel fazem parte dos MDV. Alguns estudos têm sido feitos para identificar a influência dos componentes do dossel sobre o albedo da cobertura vegetal, obtendo a melhor configuração dos parâmetros a serem usados. Para a vegetação, importantes parâmetros são estimados a partir da reflectância em faixas espectrais específicas. Nesse aspecto o objetivo desse trabalho foi adicionar no modelo IBIS – Integrated Biosphere Simulator três bandas vermelho, infravermelho próximo e azul, referentes às bandas 1, 2 e 3 do sensor MODIS, a bordo dos satélites TERRA e AQUA, observando a sensibilidade aos parâmetros ópticos (reflectância de folhas) e arquitetônicos (inclinação das folhas) do dossel e calibrando esses parâmetros de acordo com os produtos de reflectância de superfície e índice de vegetação do MODIS para a Reservado Cuieiras (K34). A análise de sensibilidade indicou forte influência dos parâmetros referentes à parte superior do dossel. A combinação dos parâmetros que minimizou o RMSE do EVI – Enhanced Vegetation Index (RMSEmin =0,0245) foi a inclinação das folhas do dossel superior χup =0,92, reflectância das folhas da parte superior do dossel na faixa do azul ρblue−up = 0,0162, vermelho ρred−up = 0,0466 e infravermelho próximo ρnir−up = 0,4427. ABSTRACT: Studying and monitoring vegetation is the key to understand the current climate pattern in both regional and global scales. Dynamical Vegetation Models(DVM) are useful tools in biome studies, since they are based on physical principles as well as on initial and boundary conditions. They are able to obtain evidences of factors that influence the modeled environment, predicting future vegetation behavior and, in association with other models, making future predictions of vegetation influence on climate or the effect of climate change on vegetation it self. In particular, reflectance models are part of DVMs. Some studies have attempted to identify canopy elements influence on the vegetation cover albedo, obtaining the best configuration of parameters to be used. Important parameters are estimated from the reflectance inspecific spectral bands. Thus, the objective of this study was to evaluate the IBIS model - Integrated Biosphere Simulator performance running it at three bands – red, near infrared, and blue, corresponding to the bands 1, 2 and 3 of the MODIS sensor, onboard of the TERRA and AQUA satellites. The sensitivity to optical parameters (leaf reflectance) and architecture (slope of the leaves) of the canopy was also evaluated. These optical and architectural parameters were calibrated according to the surface reflectance and vegetation index from MODIS for the Cuieiras Reserve (K34). The sensitivity analysis indicated a strong influence of the upper canopy parameters.The parameters combination that minimizes the RMSE of EVI – Enhanced Vegetation Index (RMSE = 0.0245) were the slope of the upper canopy leaves χup = 0.92,reflectance from the upper canopy leaves in the blue band ρblue−up = 0.0162, red band ρred−up = 0.0466 and near infrared band ρnir−up = 0.4427.Keywords: reflectance models, tropical rainforest, remote sensing" @default.
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• W1515706937 date "2012-12-01" @default.
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• W1515706937 title "THE INFLUENCE OF ARCHITECTURAL AND SPECTRAL PARAMETERS OF A TROPICAL FOREST CANOPY UNDER ITS REFLECTANCE DESCRIBED BY IBIS MODEL" @default.
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• W1515706937 doi "https://doi.org/10.22564/rbgf.v30i4.236" @default.
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