|
|
|
| Registros recuperados: 27 | |
|
|
| Genú, Aline Marques; Universidade Estadual do Centro-Oeste; Demattê, José Alexandre Melo; Universidade de São Paulo. |
| Soil fertility variability management is one of the pioneering and important areas in which Precision Agriculture has been commercially applied. Consequently, the objective of this work was to predict soil chemical attributes through spectral responses. The 1,000 ha study area used for this report was located in Uberlândia, Minas Gerais State, Brazil. Thirty sampling points were established, at which the soil was collected at 3 different depths. The samples were chemically and physically analyzed and the radiometric data obtained in the 400 – 2500 nm range. Multiple regression equations were generated for sum of bases, cation exchange capacity, base saturation, aluminum saturation, pH, P, K, Ca, Mg, Al, and H, all using 60 soil samples. H, Al, m%, and pH... |
|
Palavras-chave: Agronoma soil chemistry; Reflectance; Laboratory sensor Solos e Nutrição de Plantas soil chemistry; Reflectance; Laboratory sensor. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/7975 |
| |
|
|
| Cabello-Pasini,Alejandro; Macías-Carranza,Víctor. |
| Leaf absorptance (A), transmittance (T) and reflectance (R) of visible solar radiation strongly correlate with chlorophyll concentration in a number of plant species, however, little is known about the optical properties of grapevine leaves. Consequently, the objective of this study was to evaluate the optical properties of intact leaves for estimating chlorophyll concentration in Cabernet Sauvignon, Merlot and Tempranillo vaieties. Leaves from Cabernet Sauvignon, Merlot and Tempranillo vines were collected at San Antonio de las Minas, Baja California, México, in 2009, and A, T and R determined with a spectroradiometer. While leaf age played a significant role on the leaf chlorophyll concentration, the chlorophyll a+b concentration vs. R, T and A... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Absorptance; Chlorophyll; Reflectance; Transmittance; Optical properties. |
| Ano: 2011 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000800007 |
| |
|
| |
|
|
| Cruz Durán, Jairo Aarón de la. |
| El desarrollo de los sensores remotos por los países desarrollados, ha permitido generar imágenes satelitales de alta resolución, e instrumentos que proporcionan información precisa: cámaras digitales, espectrómetros, ceptómetros, sensores quánticos lineales, analizadores de dosel, entre otros; así como también equipo de cómputo de alta capacidad y potencia, programas de cómputo para digitalización y análisis de la información en tiempo real. Por lo tanto, el objetivo de esta investigación fue generar nuevas tecnologías que den mayor certidumbre y competitividad a la comercialización, mayor valor de la producción en los mercados futuros, valor de aseguramiento del cultivo y su producción, a través de generación de conocimiento e información en tiempo real... |
|
Palavras-chave: Biotelemática; Espectroradiómetro; Reflectancia; Capsicum annuum; Fragaria x ananassa; Sensores remotos; Escáner de escritorio; Biotelematic; Spectroradiometer; Reflectance; Remote sensing; Desktop scanner; Doctorado; Edafología. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1902 |
| |
|
|
| Gasga Peña, Rosalino. |
| Con la finalidad de encontrar un procedimiento económico, rápido y confiable que estime el contenido de nitrógeno (N), se estableció un experimento en los invernaderos del Colegio de Postgraduados. La unidad experimental consistió de una planta de chile manzano sembrada en maceta de polietileno negro calibre 600 de 40x45 cm a una distancia de 1.5 m entre hileras y 0.5 m entre macetas. Como sustrato se utilizó tezontle rojo. Se emplearon soluciones nutritivas con cuatro niveles de N: 4, 8, 12 y 16 molc m-3 (en el último tratamiento 2 molc m-3 corresponden a NH4+), a partir de la solución Steiner. El diseño experimental fue completamente al azar con cuatro repeticiones. En plena fructificación, en cada unidad experimental, se seleccionaron seis hojas y se... |
|
Palavras-chave: Reflectancia; Capsicum pubescens R. y P.; Sensores remotos; Escáner de escritorio; Reflectance; Remote sensing; Desktop scanner; Doctorado; Edafología. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/468 |
| |
|
| |
|
| |
|
|
| Gasga Peña, Rosalino. |
| Con la finalidad de encontrar un procedimiento económico, rápido y confiable que estime el contenido de nitrógeno (N), se estableció un experimento en los invernaderos del Colegio de Postgraduados. La unidad experimental consistió de una planta de chile manzano sembrada en maceta de polietileno negro calibre 600 de 40x45 cm a una distancia de 1.5 m entre hileras y 0.5 m entre macetas. Como sustrato se utilizó tezontle rojo. Se emplearon soluciones nutritivas con cuatro niveles de N: 4, 8, 12 y 16 molc m-3 (en el último tratamiento 2 molc m-3 corresponden a NH4+), a partir de la solución Steiner. El diseño experimental fue completamente al azar con cuatro repeticiones. En plena fructificación, en cada unidad experimental, se seleccionaron seis hojas y se... |
|
Palavras-chave: Reflectancia; Capsicum pubescens R. y P.; Sensores remotos; Escáner de escritorio; Reflectance; Remote sensing; Desktop scanner; Doctorado; Edafología. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/468 |
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| MADEIRA NETTO, J. da S.; BAPTISTA, G. M. de M.. |
| Usando as cores para caracterizar as propriedades dos solos ou atraves de fotografias aereas para a discriminacao de pedoformas , os pedologos, ja ha algum tempo, compreenderam a importancia do uso dos recursos oferecidos pela luz refletida como instrumento para compreender a distribuicao dos solos na paisagem ou para a descricao de suas propriedades. A rapida evolucao da espectroscopia de reflectancia, amplamente explorada no sensoriamento remoto multiespectral, permitiu estender esse uso a comprimentos de onda outros que o visivel. Mais recentemente, com o desenvolvimento da espectroscopia de imageamento o interesse pelas propriedades de reflectancia espectral dos solos ganha nova importancia, por causa da possibilidade de identificar e de mapear... |
| Tipo: Livros |
Palavras-chave: Reflectancia; Espectometria; Spectometry; Cerrado; Solo; Reflectance; Soil. |
| Ano: 2000 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/564014 |
| |
|
|
| Dupouy, Cecile; Wattelez, Guillaume; Lefevre, Jerome; Juillot, Farid; Andreoli, Remi; Lille, Didier; Murakami, Hiroshi; Roettgers, Rudiger; Frouin, Robert. |
| Shortly after strong rains or tropical storms, chlorophyll-a concentration (Chla), turbidity, and colored dissolved organic matter (CDOM) in the lagoon of New Caledonia may be tripled. This effect is visible as far as 50 km offshore. The Eastern Coast of New Caledonia is more impacted than the Western Coast because of its geomorphological structure. Higher frequency and intensity of the rains, and the dominance of highly erosive lateritic formations resulted from deep weathering of ultramafic rocks. At the deeper parts of the lagoon (> 20 m), increases of Chla, turbidity, and CDOM absorption can be detected by satellite imagery with their plumes extending off shore as a result of wind-driven circulation in the lagoon. Such -increases agree with the... |
| Tipo: Text |
Palavras-chave: Minerals; Phytoplankton; CDOM; FDOM; Ocean color; Reflectance; New Caledonia; Tropical Pacific Ocean; Lagoons. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00481/59308/62064.pdf |
| |
|
| |
|
|
| 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 |
| |
|
|
| 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 |
| |
|
| |
|
| |
| Registros recuperados: 27 | |
|
|
|
