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Aplicacion de sensores remotos en la deteccion y evaluacion de plagas y enfermedades en la vegetacion. Infoteca-e
SA, I. B.; ANTONIO GARCIA, R. de; ALMOROX, J. A..
Mediante la utilizacion de sensores remotos, la deteccion, registro y analisis de las alteraciones ocurridas en el comportamiente espectral de la cobertura vegetal, permitem caracterizar y evaluar el estado nutricional y fitosanitario de las plantas, detectando incidencias de plagas y enfermedades e inferir posibles carencias nutricionales. En el trabajo se comprueba que el estudio de la reflectancia en la region del infrarrojo cercano permite detectar eficazmente el inicio de danos al producirse cambios en el comportamiento espectral de las plantas. Esta aplicacion permite uma deteccion mas temprana de los danos, pues el ataque de enfermedades o plagas puede ser detectado incluso antes de que la planta presente sintomas visuales de deterioro.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Refletancia; Plant; Diseases; Pest; Near infrared; Analysis; Análise; Doença; Planta; Praga; Raio Infravermelho; Sensoriamento Remoto; Vegetação; Reflectance; Remote sensing; Vegetation.
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133846
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Characterization and discrimination of soils by their reflected electromagnetic energy PAB
Demattê,José Alexandre M..
The objective of this work was to verify if reflected energy of soils can characterize and discriminate them. A spectroradiometer (Spectral reflectance between: 400-2,500 nm) was utilized in laboratory. The soils evaluated are located in Bauru region, SP, Brazil, and are classified as Typic Argiudoll (TR), Typic Eutrorthox (LR), Typic Argiudoll (PE), Typic Haplortox (LE), Typic Paleudalf (PV) and Typic Quartzipsamment (AQ). They were characterized by their spectral reflectance as for descriptive conventional methods (Brazilian and International) according to the types of spectral curves. A method for the spectral descriptive evaluation of soils was established. It was possible to characterize and discriminate the soils by their spectral reflectance, with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Remote sensing; Infrared spectrophotometry; Reflectance; Absorbance.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001000013
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Detailed validation of the bidirectional effect in various Case 1 waters for application to ocean color imagery ArchiMer
Voss, K. J.; Morel, A.; Antoine, D..
The radiance viewed from the ocean depends on the illumination and viewing geometry along with the water properties, and this variation is called the bidirectional effect. This bidirectional effect depends on the inherent optical properties of the water, including the volume scattering function, and is important when comparing data from different satellite sensors. The current model of f/Q, which contains the bidirectional effect, by Morel et al. (2002) depends on modeled, not measured, water parameters, thus must be carefully validated. In this paper we combined upwelling radiance distribution data from several cruises, in varied water types and with a wide range of solar zenith angles. We compared modeled and measured L(view)/L(nadir) and found that the...
Tipo: Text Palavras-chave: Radiance distribution; Optical properties; Camera system; Reflectance; Instruments.
Ano: 2007 URL: https://archimer.ifremer.fr/doc/00209/32011/30548.pdf
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Diagnóstico de deficiencias de nitrógeno y maganesio con imágenes digitales. Colegio de Postgraduados
Reyes Flores, Maciel.
La detección oportuna de deficiencias nutrimentales en hojas de plantas cultivadas permite tomar medidas correctivas inmediatas asi como predecir rendimientos. Las características espectrales y de textura de las imágenes se pueden utilizar para obtener información y correlacionarlos con el estado nutrimental de elementos esenciales que generan sintomatología similar en hojas de las plantas. En la presente investigación se estableció un experimento para medir las propiedades espectrales y característica texturales del cultivo de frijol con diferentes concentraciones de nitrógeno y magnesio de imágenes obtenidas con escáner. A partir de los valores de reflectancia se generaron modelos de regresión para asociar la concentración de nitrógeno y magnesio en el...
Palavras-chave: Reflectancia; Discriminación; Espacios de color; Textura; Redes neuronales; Reflectance; Discrimination; Color spaces; Texture; Neural networks; Edafología; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/2077
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Diet authentication in sheep from the composition of animal tissues and products R. Bras. Zootec.
Prache,Sophie.
There is currently an increased consumer demand for information on herbivore production factors, particularly animal diet. To meet these demands, producers and commercial entities develop specifications via quality certifications. There is therefore a need for analytical tools that may guarantee that the specification commitments have been fully met or to help with constructing them. The present paper reviews the current state of knowledge concerning diet authentication in sheep meat and milk, the different approaches that have been investigated, some leading examples concerning the discrimination of contrasting feeding situations, together with the persistence of some diet markers in the event of changes in animals' diet. The nature of the diet strongly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Authentication; Diet tracers; Meat; NIR spectroscopy; Pasture-feeding; Reflectance.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001300036
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Digital Soil Mapping of Soil Properties in the “Mar de Morros” Environment Using Spectral Data Rev. Bras. Ciênc. Solo
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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Espectrometria de infravermelho próximo na predição da textura de solos desenvolvidos de basalto. Repositório Alice
CANIZELLA, B. T.; VENDRAME, P. R. S.; MARQUEZIN, P. P.; FELIX, J. C.; BRITO, O. R.; ABADE, V. S.; MARCHAO, R. L..
A textura dos solos tem sido determinada através de métodos analíticos que muitas vezes são caros e lentos. Ademais, em solos muito argilosos, a dispersão química e mecânica nem sempre é eficiente em separar a fração silte da fração argila, superestimando o conteúdo de silte dos solos. O objetivo do trabalho foi testar a espectroscopia de reflectância de infravermelho próximo (NIRS) na avaliação da textura de solos de basalto. Foram coletadas 214 amostras de terra na região Norte do Estado do Paraná, Brasil, nos municípios de Bela Vista do Paraíso e Londrina, em áreas com predominância de Latossolos, Nitossolos e Neossolos, classificados. As amostras foram coletadas nas profundidades de 0-20 cm e 60-80 cm. Foi realizada análise textural pela dispersão...
Tipo: Separatas Palavras-chave: Reflectância; Solo basáltico; Solo; Espectrometria; Textura do solo; Cerrado; Soil; Spectroscopy; Reflectance; Soil texture; Basaltic soils; Savannas; Brazil.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1014214
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Fluxos radiativos na cultura da mangueira, em Petrolina-PE. Repositório Alice
TEIXEIRA, A. H. de C.; LOPES, P. M. O.; SILVA, B. B. da; AZEVEDO, P. V. de.
Dados de radiacao global solar incidente (Rg) e refletida (Rr ) e do sol da radiacao (Sr), coletados no campo experimental da Embrapa Semi-Arido - Petrolina-PE. Foram utilizados na avaliacao do coeficiente de reflexao e do de radiacao na cultura da mangueira (Tommy .Atkins). com 6 anos idade sensores de radiacao foram instalados em lima torre micrometeorologia a 1 m acima da folhagem. Os dados foram coletados por sistemas de aquisicao programados para fazer leituras a cada 5 segundos e armazenar a media de cada 10 minutos para o periodo de 06/08 a 30/10/98. O coeficiente de reflexao medio variou de 0,21, durante o florescimento a 0.14, no periodo de desenvolvimento dos frutos.. A razao entre Sr e Rg variou de 0,65 no periodo de florescimento a 0,58 no...
Tipo: Parte de livro Palavras-chave: Refletancia; Mango; Manga; Mangifera Indica; Radiação Solar; Mangoes; Reflectance; Solar radiation.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/134384
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Hyperspectral remote sensing as an alternative to estimate soil attributes Rev. Ciênc. Agron.
Demattê,José A. M.; Alves,Marcelo Rodrigo; Gallo,Bruna Cristina; Fongaro,Caio T.; Souza,Arnaldo Barros e; Romero,Danilo Jefferson; Sato,Marcus Vinicius.
Minimizing environmental impacts and increasing crop productivity depend mainly on the knowledge of chemical, physical and mineralogical characteristics of the soil attributes. However, traditional methods are timeconsuming and costly. The objective of this study was to determine and validate a method to quantify soil attributes using UV-Vis-NIR Spectroscopy as an alternative to conventional methods of soil analyses. The work comprised two main phases: (1) creation and calibration of statistical models to determine the soil attributes derived from spectral data extracted from soil samples collected in area 1, (2) validation of statistical models in area 2 and correlations between the estimated and observed values (conventional method) for each soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reflectance; Soil analysis; Remote Sensing.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200223
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HYPERSPECTRAL SPECTROSCOPY TO DETECT DIFFERENT RESPONSES OF TWO SOYBEAN (GLYCINE MAX) CULTIVARS TO CHARCOAL ROT (MACROPHOMINA PHASEOLINA) TOXIN REA
Al-Ahmadi,Ameer; Subedi,Arjun; Choudhary,Ruplal; Fakhoury,Ahmad; Watson,Dennis.
ABSTRACT Previous studies have confirmed the potential of hyperspectral spectroscopy (HS) to detect charcoal rot toxin effect on soybean (Glycine max). However, there is no evidence that it can differentiate among difference responses to that effect. This research tested the potential of HS (900–2400 nm) to differentiate different responses to charcoal rot effect caused by the fungal pathogen Macrophomina phaseolina. Known susceptible ‘Pharaoh’ and resistant ‘Spencer’ cultivars of soybean seedlings at the V1 stage were tested, and HS reflectance was measured in each treatment at 0 h (just before toxin treatment), 24 h, and 36 h after toxin treatment. For both cultivars, reflectance generally decreased up to 10% over time for controls and increased for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hyperspectral spectroscopy; Glycine Max; Charcoal rot; Ratio; Reflectance.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100078
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Identificação de cerrado rupestre por meio de imagens multitemporais do landsat: proposta metodológica. Repositório Alice
NASCIMENTO, E. R. P.; SANO, E. E..
O Cerrado Rupestre corresponde a uma formação savânica do bioma Cerrado, ocorre em relevos acidentados e em meio a afloramentos rochosos, apresenta elevada biodiversidade e várias espécies endêmicas e funciona como barreira para a expansão agrícola. No estado de Goiás, ocorrências expressivas dessa fitofisionomia são encontradas no Parque Nacional da Chapada dos Veadeiros (PNCV). O objetivo deste estudo foi desenvolver uma nova abordagem metodológica para discriminar Cerrado Rupestre do PNCV com base em imagens multitemporais do satélite Landsat. Sete cenas do referido satélite foram convertidas para reflectância de superfície terrestre com suporte do algoritmo de correção atmosférica denominado FLAASH (Fast Line-of-Sight Atmospheric Analysis of Spectral...
Tipo: Separatas Palavras-chave: Correção atmosférica; Reflectância; Segmentação de imagens; Cerrado rupestre; Atmospheric correction; Image segmentation; Savanna.; Cerrado; Satélite; Sensoriamento Remoto.; Reflectance; Remote sensing..
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/860760
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Identificación de la deficiencia de magnesio en pepino mediante espectroradiometría. Colegio de Postgraduados
Aguilar Ramírez, María del Rocío.
La utilización de sensores remotos se describe como una técnica de diagnóstico nutrimental promisoria en diferentes aspectos de la agricultura. En este sentido, el presente trabajo tuvo como objetivo determinar estrés por magnesio en pepino, a través de técnicas de percepción remota. Se determinó la reflectancia de hojas recientemente maduras de pepino mediante el uso de Radiómetro, y de imágenes obtenidas con escáner y con cámara digital; también se estimó la concentración de clorofila utilizando un medidor portátil (SPAD 502) y la concentración de magnesio de referencia fue determinada por espectrofotometría de emisión atómica. A partir de estas mediciones se generaron modelos de tipo polinómico, logarítmico y exponencial para relacionar las propiedades...
Palavras-chave: Sensores remotos; Propiedades ópticas; Firmas espectrales; Magnesio; Reflectancia; Remote sensing; Optical properties; Spectral signatures; Magnesium; Reflectance; Maestría; Edafología.
Ano: 2011 URL: http://hdl.handle.net/10521/401
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Impact assesment of Cyclone Sally on the almost atoll of Aitutaki (cook Islands) by remote sensing ArchiMer
Loubersac, Lionel; Dahl, Arthur; Collote, Pascal; Lemaire, Olivier; D'Ozouville, Laurent.
Damage from tropical cyclones can have major consequences for coral reef structure and ecology, as well as for human communities and human uses of coral reef resources. Remote sensing with high resolution multispectral satellite images can be used to asses large scale cyclone damages on coral reef areas. SPOT images of the almost atoll of AITUTAKI (Cook Islands) taken in june 1986 and february 1987 after the passage of Cyclone Sally near the island in january, were transformed and subjected to a textural analysis, and then compared to asses damage on the reefs and lagoon.New shallow sand and rubble deposits showed increased reflectance, while lower reflectance seemed associated with damage to reef structure, scouring in the lagoon, deposits of terrestrial...
Tipo: Text Palavras-chave: ICRS 6; Remote sensing; Reflectance; Stresses; Cyclones; Extreme events; Coral reef; Lagoon; Natural System; External Threats & Opportunities.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00143/25380/23518.pdf
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In situ separation of soil types along transects employing Vis-NIR sensors: a new view of soil evaluation Rev. Ciênc. Agron.
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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In-flight absolute calibration of the CBERS-2 CCD sensor data Anais da ABC (AABC)
Ponzoni,Flávio J.; Zullo Junior,Jurandir; Lamparelli,Rubens A.C..
Since the first images of the sensors on board of CBERS-2 (China-Brazil Earth Resources Satellite) satellite were made available by the National Institute for Space Research (INPE), users have asked information about the conversion of image digital numbers to physical data (radiance or reflectance). This paper describes the main steps that were carried out to calculate the in-flight absolute calibration coefficients for CBERS-2 CCD level 2 (radiometric and geometric correction) images considering the reflectance-based method. Remarks about the preliminary evaluation of these coefficients application are also presented.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Absolute calibration; CBERS-2; CCD; Reflectance.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200015
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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
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Leaf optical properties of two liana species Canavalia parviflora Benth. and Gouania virgata Reissk in different light conditions Rev. Bras. Bot.
Sanches,Maria Cristina; Válio,Ivany Ferraz Marques.
Lianas are plants that depend on support to reach some appreciable height, and they represent an important structural component of tropical forests. Although they predominate in clearings and gaps, some species survive in the understory. Changes in irradiance between these environments can affect leaf morphology and absorption of photosynthetic active radiation (PAR). We had examined the effects of different light regimes on leaf optical properties, chlorophyll content, specific leaf area, and leaf surface morphology in young seedlings of Canavalia parviflora Benth. (Fabaceae) and Gouania virgata Reissk (Rhamnaceae). The seedlings were distributed on workbenches covered by different layers of neutral shade netting, thus creating three levels of light...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf absorptance; Lianas; Light conditions; Reflectance; Specific leaf area.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000200013
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Metodologias de procesamiento de imagenes NOAA-AVHRR y su utilizacion en aplicaciones oceanograficas y biologico-pesqueras en el Atlantico sudoccidental. OceanDocs
Bava, J..
The objective was to use the synoptic capability of NOAA-AVHRR images, and the physical variables inferred from them, in order to achieve spatial and temporal analysis that may allow correlating the satellite variables with oceanographic processes and biological or fishing data. Methodologies of image processing were developed to make possible the use of AVHRR information for the standardized and reliable generation of Sea Surface Temperature (SST) images (using bands 3 to 5 in the thermal infrared), and water reflectance images (using optic bands 1 and 2) as an index of surface turbidity in coastal zones. A methodology was also generated in order to obtain gradients images derived from SST images, which allows the identification of oceanographic fronts....
Tipo: Theses and Dissertations Palavras-chave: Image processing; Satellite sensing; Surface temperature; Turbidity; Reflectance; Fishery resources; Oceanic fronts; Image processing; Turbidity; Fishery resources; Reflectance; Http://aims.fao.org/aos/agrovoc/c_37359; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_28538.
Ano: 2004 URL: http://hdl.handle.net/1834/1467
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Metodologias de procesamiento de imagenes NOAA-AVHRR y su utilizacion en aplicaciones oceanograficas y biologico-pesqueras en el Atlantico sudoccidental. OceanDocs
Bava, J..
The objective was to use the synoptic capability of NOAA-AVHRR images, and the physical variables inferred from them, in order to achieve spatial and temporal analysis that may allow correlating the satellite variables with oceanographic processes and biological or fishing data. Methodologies of image processing were developed to make possible the use of AVHRR information for the standardized and reliable generation of Sea Surface Temperature (SST) images (using bands 3 to 5 in the thermal infrared), and water reflectance images (using optic bands 1 and 2) as an index of surface turbidity in coastal zones. A methodology was also generated in order to obtain gradients images derived from SST images, which allows the identification of oceanographic fronts....
Tipo: Theses and Dissertations Palavras-chave: Image processing; Satellite sensing; Surface temperature; Turbidity; Reflectance; Fishery resources; Oceanic fronts; Image processing; Turbidity; Fishery resources; Reflectance.
Ano: 2004 URL: http://hdl.handle.net/1834/1467
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Monitoramento da umidade do solo por meio da reflectância hiperespectral de folhas de soja. Repositório Alice
CRUSIOL, L. G. T.; NANNI, M. R.; SIBALDELLI, R. N. R.; FURLANETTO, R. H.; GONCALVES, S. L.; FOLONI, J. S. S.; MERTZ-HENNING, L. M.; NEPOMUCENO, A. L.; NEUMAIER, N.; FARIAS, J. R. B..
Tipo: Parte de livro Palavras-chave: Soja; Umidade do Solo; Análise Física; Soybeans; Soil analysis; Soil water characteristic; Reflectance.
Ano: 2022 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1148235
Registros recuperados: 38
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