Consulta: creatorFacets:"Galvão,Lênio Soares"
Registros recuperados: 3
Data/hora: 13/06/2024 07:39:20

Caracterização mineralógica de solos tropicais por sensoriamento remoto hiperespectral
Provedor de dados: 86
Autores: Pizarro,Marco Antonio; Epiphanio,José Carlos Neves; Galvão,Lênio Soares.
Dados hiperespectrais coletados no Brasil pelo sensor AVIRIS (Airborne Visible/Infrared Imaging Spectrometer) foram utilizados para a caracterização espectral de uma típica cena agropastoril e para testar o uso da técnica Spectral Feature Fitting (SFF) na identificação de minerais argilosos na imagem. Utilizou-se um modelo linear de mistura espectral, usando como membros de referência a vegetação verde e seca, a água, e os solos Nitossolo Vermelho, Latossolo Vermelho e Neossolo Quartzarênico órtico. Na identificação dos minerais, foram selecionados espectros de referência da biblioteca espectral do JPL/NASA. Os espectros dos pixels e das referências foram normalizados pelo método do contínuo espectral, entre 2.100 e 2.330 nm, e depois comparados quanto à...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sensores; Reflectância; Espectrometria; Recursos minerais; Identificação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001001000010

The combined use of reflectance, emissivity and elevation Aster/Terra data for tropical soil studies
Provedor de dados: 90
Autores: Breunig,Fábio Marcelo; Galvão,Lênio Soares; Formaggio,Antonio Roberto; Couto,Eduardo Guimarães.
Reflectance, emissivity and elevation data of the sensor ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer)/Terra were used to characterize soil composition variations according to the toposequence position. Normalized data of SWIR (shortwave infrared) reflectance and TIR (thermal infrared) emissivity, coupled to a soil-fraction image from a spectral mixture model, were evaluated to separate bare soils from nonphotosynthetic vegetation. Regression relationships of some soil properties with reflectance and emissivity data were then applied on the exposed soil pixels. The resulting estimated values were plotted on the ASTER-derived digital elevation model. Results showed that the SWIR bands 5 and 6 and the TIR bands 10 and 14 measured the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digital elevation model; Soil constituents; Remote sensing; Topography.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600027

Crop area estimate from original and simulated spatial resolution data and landscape metrics
Provedor de dados: 63
Autores: Soares,Dênis de Moura; Galvão,Lênio Soares; Formaggio,Antônio Roberto.
Images acquired at the same day by the ETM+/Landsat-7 (30 m of spatial resolution) and MODIS/Terra (250 m) sensors were used to estimate areas of three major crops (soybean, sugarcane, and corn) with different landscape patterns in Southeastern Brazil. Majority filtering of ETM + classification results was applied to describe the behavior of 15 selected landscape metrics at distinct simulated spatial resolutions (90, 150, 210 and 270 m). By using regression models, the performance of MODIS and derived metrics to predict adequately the crop area, considering ETM+ data as reference, were analyzed. Results showed that the MODIS instrument overestimated the areas of soybean (15%) and sugarcane (1%), and underestimated the area of corn (12%). Multiple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MODIS; Remote sensing; Regression; Soybean; Sugarcane.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500003