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	Provedor de dados Anais da ABC (AABC) (1) REA (1) Autor Breunig,Fábio M. (2) Galvão,Lênio S. (2) Epiphanio,José C. N. (1) Epiphanio,José C.N. (1) Formaggio,Antonio R. (1) Formaggio,Antônio R. (1) Mais... Palavra-chave EVI (2) NDVI (2) Remote sensing (2) Directional effects (1) Leaf area index (1) MODIS (1) NDWI (1) Reflectance (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2013 (1) 2012 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Influence of data acquisition geometry on soybean spectral response simulated by the prosail model REA Breunig,Fábio M.; Galvão,Lênio S.; Formaggio,Antonio R.; Epiphanio,José C. N.. View angle and directional effects significantly affect reflectance and vegetation indices, especially when daily images collected by large field-of-view (FOV) sensors like the Moderate Resolution Imaging Spectroradiometer (MODIS) are used. In this study, the PROSAIL radiative transfer model was chosen to evaluate the impact of the geometry of data acquisition on soybean reflectance and two vegetation indices (Normalized Difference Vegetation Index - NDVI and Enhanced Vegetation Index -EVI) by varying biochemical and biophysical parameters of the crop. Input values for PROSAIL simulation were based on the literature and were adjusted by the comparison between simulated and real satellite soybean spectra acquired by the MODIS/Terra and hyperspectral... Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf area index; NDVI; EVI; Reflectance; MODIS; Remote sensing. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100018 Variation of MODIS reflectance and vegetation indices with viewing geometry and soybean development Anais da ABC (AABC) Breunig,Fábio M.; Galvão,Lênio S.; Formaggio,Antônio R.; Epiphanio,José C.N.. Directional effects introduce a variability in reflectance and vegetation index determination, especially when large field-of-view sensors are used (e.g., Moderate Resolution Imaging Spectroradiometer - MODIS). In this study, we evaluated directional effects on MODIS reflectance and four vegetation indices (Normalized Difference Vegetation Index - NDVI; Enhanced Vegetation Index - EVI; Normalized Difference Water Index - NDWI1640 and NDWI2120) with the soybean development in two growing seasons (2004-2005 and 2005-2006). To keep the reproductive stage for a given cultivar as a constant factor while varying viewing geometry, pairs of images obtained in close dates and opposite view angles were analyzed. By using a non-parametric statistics with... Tipo: Info:eu-repo/semantics/article Palavras-chave: NDWI; EVI; NDVI; Remote sensing; Directional effects. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200004 Registros recuperados: 2 Primeira ... 1 ... Última

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