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| Registros recuperados: 16 | |
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| Silva,Elisângela Benedet; Giasson,Élvio; Dotto,André Carnieletto; Caten,Alexandre ten; Demattê,José Alexandre Melo; Bacic,Ivan Luiz Zilli; Veiga,Milton da. |
| ABSTRACT The success of soil prediction by VIS-NIR-SWIR spectroscopy has led to considerable investment in large soil spectral libraries. The aims of this study were 1) to develop a soil VIS-NIR-SWIR spectroscopy approach using legacy soil samples to improve spectral soil information in a regional scale; (2) to compare six spectral preprocessing techniques; and (3) to compare the performance of linear and non-linear multivariate models for prediction of sand and clay content. A total of 1,534 legacy soil samples, stored by Epagri, were collected from agricultural areas in 2009 on a regional scale, covering 260 municipalities of Santa Catarina. Six spectral preprocessing techniques were applied and compared with reflectance spectra (control treatment) in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil spectral library; Multivariate models; Preprocessing techniques; Santa Catarina. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100304 |
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| Campbell,Patrícia Morais da Matta; Fernandes Filho,Elpídio Inácio; Francelino,Márcio Rocha; Demattê,José Alexandre Melo; Pereira,Marcos Gervasio; and,Clécia Cristina Barbosa Guimarães; Pinto,Luiz Alberto da Silva Rodrigues. |
| ABSTRACT Quantification of soil properties is essential for better understanding of the environment and better soil management. The conventional techniques of laboratory analysis are sometimes costly and detrimental to the environment. Thus, development of new techniques for soil analysis that do not generate residues, such as spectroscopy, is increasingly necessary as a viable way to estimate a wide range of soil properties. The objective of this study was to predict the levels of organic carbon (OC), clay, and extractable phosphorus (P), from the spectral responses of soil samples in the visible and near infrared (Vis-NIR), medium infrared (MIR), and Vis-NIR-MIR using different preprocessing methods combined with five prediction models. Soil samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spectral analysis; Reflectance; Chemometrics. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100314 |
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| Sousa Junior,José Geraldo de Abreu; Demattê,José Alexandre Melo; Genú,Aline Marques. |
| Parte da variabilidade dos índices de produção agrícola está associada com as características do solo e da paisagem. Dessa forma, práticas de manejo, como a adubação, devem levar em consideração esta variabilidade. O sensoriamento remoto é uma ferramenta que pode fornecer, de maneira rápida, informações para o manejo do solo, pois relaciona a radiação eletromagnética com os atributos do solo. Assim, este trabalho teve como objetivo avaliar o comportamento espectral, em dois níveis de aquisição de dados (terrestre e orbital), de diferentes classes de solos ao longo de toposseqüências na região de São Carlos e Ibaté, SP. Para isso, amostras de terra georreferenciadas foram coletadas em 319 pontos, em três profundidades. Em seguida, obtiveram-se os dados... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Toposseqüência; Atributos do solo; Reflectância. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200027 |
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| Araújo,Suzana Romeiro; Demattê,José Alexandre Melo; Garbuio,Fernando José. |
| Com a correção da acidez, nutrientes importantes para o cultivo do milho tornam-se mais disponíveis à planta, promovendo o aumento de produtividade. Objetivou-se com este estudo avaliar as alterações químicas ocorrentes em dois solos e na produção de matéria seca de milho pela aplicação de corretivos com diferentes graus de reatividade. Foi realizado um primeiro experimento em casa de vegetação, aplicando-se doses de três calcários comerciais, sendo um com reatividade média, denominado A (RE = 85,7 %; PRNT = 88,3 %), outro com reatividade baixa denominado B (RE = 83,7 %; PRNT = 76,2 %), e outro, denominado C (RE = 99,1 %; PRNT = 105,3 %) altamente reativo, em quatro cultivos sucessivos de milho. Os solos utilizados foram Neossolo Quartzarênico e Latossolo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calagem; Efeito residual; Zea mays. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600024 |
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| Demattê,José Alexandre Melo; Guimarães,Clécia Cristina Barbosa; Fongaro,Caio Troula; Vidoy,Emmily Larissa Felipe; Sayão,Veridiana Maria; Dotto,André Carnieletto; Santos,Natasha Valadares dos. |
| ABSTRACT: The study of soils, including their physical and chemical properties, is essential for agricultural management. Soil quality must be maintained to ensure sustainable production of food and conservation of natural resources. In this context, soil mapping is important to provide spatial information, which can be performed using remote sensing (RS) techniques. Modeling through use of satellite data is uncertain regarding the amplitude of replicability of the models. The aim of this study was to develop a quantification model for soil texture based on reflectance information from a continuum of bare soils, obtained by overlapping multi-temporal satellite images, and apply this model to an unknown region to evaluate its applicability. Spectral data... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil texture; Remote sensing; Bare soil mask; Multiple linear regression; Digital soil mapping. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100310 |
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| Poppiel,Raúl Roberto; Lacerda,Marilusa Pinto Coelho; Oliveira Junior,Manuel Pereira de; Demattê,José Alexandre Melo; Romero,Danilo Jefferson; Sato,Marcus Vinicius; Almeida Júnior,Leonardo Rafael de; Cassol,Luiz Felipe Moreira. |
| ABSTRACT: Traditional method of soil survey is expensive, slow, and must be carried out by experienced researchers. Thus, advances in soil observation technologies and the need to obtain information quickly by modern techniques have intensified the use of proximal sensing. This study characterized surface reflectance spectra (A horizon) and related them to traditional soil classification, based on morphological, physical, and chemical properties of representative pedogenetic profiles, developed in two toposequences of the Distrito Federal, Brazil. In the toposequences, 15 soil profiles were selected for a complete morphological description and sampling for laboratory analyses. Soil-landscape relationships were established, and profiles were classified to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Toposequences; Soil-landscape relationships; Soil spectroscopy; Spectral morphology; Kubelka-Munk. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100300 |
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| Demattê,José Alexandre Melo; Alves,Marcelo Rodrigo; Terra,Fabricio da Silva; Bosquilia,Raoni Wainer Duarte; Fongaro,Caio Troula; Barros,Pedro Paulo da Silva. |
| ABSTRACT It is often difficult for pedologists to “see” topsoils indicating differences in properties such as soil particle size. Satellite images are important for obtaining quick information for large areas. However, mapping extensive areas of bare soil using a single image is difficult since most areas are usually covered by vegetation. Thus, the aim of this study was to develop a strategy to determine bare soil areas by fusing multi-temporal satellite images and classifying them according to soil textures. Three different areas located in two states in Brazil, with a total of 65,000 ha, were evaluated. Landsat images of a specific dry month (September) over five consecutive years were collected, processed, and subjected to atmospheric correction... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bare soils; Satellite images; Spectral sensing; Multi-temporal images; Digital soil mapping; Soil remote sensing. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100311 |
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| Nanni,Marcos Rafael; Demattê,José Alexandre Melo. |
| Com vistas em avaliar o comportamento da linha do solo para diferentes classes de solos, este trabalho foi realizado, utilizando-se dados de reflectância por meio de um espectrorradiômetro em laboratório. Amostras representativas dos horizontes superficiais e subsuperficiais de 18 classes coletadas em uma área piloto no Município de Rafard, sudoeste de São Paulo, foram secas, peneiradas e acondicionadas para leitura espectral. Os dados foram tabulados, para simularem as bandas 3 e 4 do TM-Landsat e construção dos gráficos. Os resultados demonstraram que as linhas de solo obtidas para as amostras de ambas as camadas comportaram-se de maneira semelhante, estando dispostas ortogonalmente aos eixos de um gráfico, com valores de R² próximos a 1,0 para todas as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reflectância; Índice de vegetação; Comportamento espectral. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832006000600012 |
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| Bazaglia Filho,Osmar; Rizzo,Rodnei; Lepsch,Igo Fernando; Prado,Hélio do; Gomes,Felipe Haenel; Mazza,Jairo Antonio; Demattê,José Alexandre Melo. |
| Since different pedologists will draw different soil maps of a same area, it is important to compare the differences between mapping by specialists and mapping techniques, as for example currently intensively discussed Digital Soil Mapping. Four detailed soil maps (scale 1:10.000) of a 182-ha sugarcane farm in the county of Rafard, São Paulo State, Brazil, were compared. The area has a large variation of soil formation factors. The maps were drawn independently by four soil scientists and compared with a fifth map obtained by a digital soil mapping technique. All pedologists were given the same set of information. As many field expeditions and soil pits as required by each surveyor were provided to define the mapping units (MUs). For the Digital Soil Map... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil cartography; Detailed soil survey; Remote sensing; Soil-landscape relationship. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500003 |
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| Fiorio,Peterson Ricardo; Demattê,José Alexandre Melo; Nanni,Marcos Rafael; Genú,Aline Marques; Martins,Juliano Araujo. |
| Soil components, such as organic matter, the levels and form of iron oxides, moisture and texture, influence the interaction of the soil with electromagnetic energy, so that knowledge of the energy reflected by different classes of soil is therefore of help in their discrimination. The aim of this study was to evaluate the possibility of differentiating classes of soils along two transects, by means of the field spectral behaviour of different classes, using both visual and multivariate statistical analysis. Equidistant points were marked along the transects, 100 m apart, where geo-referenced soil samples were collected from the surface layer at a depth of 0 to 0.20 m. In the area under study, ten classes of soil were described by means of laboratory... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Remote sensing; Soil survey; Reflectance; Soil spectroradiometry. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000300002 |
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| Clemente,Celso Augusto; Demattê,José Alexandre Melo; Mafra,Álvaro Luiz; Bentivenha,Sérgio Ricardo Portes. |
| O presente estudo teve por objetivo caracterizar diferentes fases de intemperismo de um solo e relacioná-las com seu comportamento espectral. Um perfil pedológico desenvolvido sobre diabásio da região de Capivari-SP, foi descrito morfologicamente, identificando-se seis fases de alteração. Os atributos analisados foram granulometria, composição química e mineralógica. A reflectância espectral do solo foi avaliada em laboratório através de espectrorradiômetro na faixa de 300 a 2500 nm. O perfil apresentou grau de intemperismo moderado, o que foi evidenciado pela alta relação silte/argila observada abaixo do horizonte Bi. Os horizontes subsuperficiais também apresentaram alto teor de nutrientes, especialmente P, Ca e Mg, que estavam relacionados com a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caulinita; Reflectância espectral; Gibbsita; Rocha básica; Vermiculita-esmectita. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100026 |
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| Nanni,Marcos Rafael; Povh,Fabrício Pinheiro; Demattê,José Alexandre Melo; Oliveira,Roney Berti de; Chicati,Marcelo Luiz; Cezar,Everson. |
| The importance of understanding spatial variability of soils is connected to crop management planning. This understanding makes it possible to treat soil not as a uniform, but a variable entity, and it enables site-specific management to increase production efficiency, which is the target of precision agriculture. Questions remain as the optimum soil sampling interval needed to make site-specific fertilizer recommendations in Brazil. The objectives of this study were: i) to evaluate the spatial variability of the main attributes that influence fertilization recommendations, using georeferenced soil samples arranged in grid patterns of different resolutions; ii) to compare the spatial maps generated with those obtained with the standard sampling of 1 sample... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil attributes; Grid sampling; Kriging; Cross-validation; Kappa statistic. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300017 |
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| Demattê,José Alexandre Melo; Vasques,Gustavo de Mattos; Corrêa,Edvânia Aparecida; Arruda,Gustavo Pais de. |
| O presente trabalho utilizou ferramentas de sensoriamento remoto e sistema de informação geográfica, aliadas às informações espectrais do solo e quantitativas e qualitativas do relevo, para a caracterização e discriminação das classes de solos desenvolvidos do Grupo Barreiras na região do município de Porto Grande, Amapá. Após o mapeamento semidetalhado de solos, realizou-se a caracterização pontual das amostras dos perfis por meio de espectroscopia de visível e infravermelho (400-2500 nm), e a análise espacial das redes de drenagem e relevo a partir de fotos aéreas e imagens de radar. As informações quantitativas do relevo foram mais eficientes na caracterização e discriminação dos solos estudados do que as qualitativas, enquanto as informações espectrais... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fotografia aérea; Espectroscopia de visível e infravermelho; Classificação de solos; Geomorfologia. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000300018 |
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| Demattê,José Alexandre Melo; Terra,Fabrício da Silva; Quartaroli,Carlos Fernando. |
| Remote sensing has a high potential for environmental evaluation. However, a necessity exists for a better understanding of the relations between the soil attributes and spectral data. The objective of this work was to analyze the spectral behavior of some soil profiles from the region of Piracicaba, São Paulo State, using a laboratory spectroradiometer (400 to 2500 nm). The relations between the reflected electromagnetic energy and the soil physical, chemical and mineralogical attributes were analyzed, verifying the spectral variations of soil samples in depth along the profiles with their classification and discrimination. Sandy soil reflected more, presenting a spectral curve with an ascendant form, opposite to clayey soils. The 1900 nm band... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil reflectance; Soil attributes; Soil classification. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000300015 |
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| Registros recuperados: 16 | |
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