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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
12/01/2000 |
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Data da última atualização: |
12/01/2000 |
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Autoria: |
RANSON, K. J. |
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Título: |
A study of the angular reflectance characteristics of corn and soybean canopies. |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
[West Lafayette]: Purdue University, 1983. |
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Páginas: |
168p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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Conteúdo: |
Understanding the characteristic of vegetation canopy reflectance is important if remotely sensed data is to be fully exploited to monitore the amount and status of agricultural resources. Since vegetation canopies are not simple Lambertian reflectors the affects of ilumination and viewing geometry must be understood to enhance the interpretation of the data. In this study the diurnal and seasonal directional reflectance characteristics of two important agricultural crops: corn (Zea mays L.) and soybean (Glycine max (L.) Merr.) were examined. Spectral reflectance factor (RF), agronomic and biophysical measurements were acquired on three dates during 1980 for soybeans and on five dates in 1982 for corn over a wide range of sun and view angles. A pronounced sun-view angle effect on soybean canopy RF was observed, especially in the 0.6 - 0.7 [micron]m (red) wavelength band for canopies with well defined row structure Near infrared (near-IR) RF and the transformed variable greenness showed a less noticeable dependence for both incomplete and complete canopies. The effect of sun angle was greatest for view directions perpendicular to the canopy rows. Analysis of the data for apparent Lambertian behavior yielded very few off- nadir view angles that approximated straigth down measurements for the red band, while near-IR and greenness had extended off-nadir view angle ranges. A geometric optics model was developed to examine the effect of shadows on the red band RF for incomplete soybean canopies. Comparison of modeled and measured results indicated that for nadir view the model explainde up to 95% of the variation in the data. A solar zenith angle dependence for visible, near-IR and middle-IR RFs was noted for corn canopies with a low leaf area index (LAI). A decrease in teh spectral contrast between vegetation and soil due to shadows was cited as the cause of the dependence. Sun angle dependence was least for canopies with higher LAIs. RFs were maximized for coincident sun and view angles and maximized when the sensor view was towards the sun. Evaluation of three linear transformations (greenness, near-IR/red ratio and normalized difference) suggestes they may be useful for correcting the sun angle dependence for nadir acquired data. A strong dependence with view angle was noted for all three transformations for low LAI canopies. Greenness and near-IR/red ratio varied with view zenith angle, normalized difference did not. The asymptotic nature of normalized difference as LAI increases was cited as the reason for the lack of variation with view angle. MenosUnderstanding the characteristic of vegetation canopy reflectance is important if remotely sensed data is to be fully exploited to monitore the amount and status of agricultural resources. Since vegetation canopies are not simple Lambertian reflectors the affects of ilumination and viewing geometry must be understood to enhance the interpretation of the data. In this study the diurnal and seasonal directional reflectance characteristics of two important agricultural crops: corn (Zea mays L.) and soybean (Glycine max (L.) Merr.) were examined. Spectral reflectance factor (RF), agronomic and biophysical measurements were acquired on three dates during 1980 for soybeans and on five dates in 1982 for corn over a wide range of sun and view angles. A pronounced sun-view angle effect on soybean canopy RF was observed, especially in the 0.6 - 0.7 [micron]m (red) wavelength band for canopies with well defined row structure Near infrared (near-IR) RF and the transformed variable greenness showed a less noticeable dependence for both incomplete and complete canopies. The effect of sun angle was greatest for view directions perpendicular to the canopy rows. Analysis of the data for apparent Lambertian behavior yielded very few off- nadir view angles that approximated straigth down measurements for the red band, while near-IR and greenness had extended off-nadir view angle ranges. A geometric optics model was developed to examine the effect of shadows on the red band RF for incomplete s... Mostrar Tudo |
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Palavras-Chave: |
Copa; Maize; Reflectancia; Spectrometry. |
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Thesagro: |
Espectrometria; Glycine Max; Iluminação; Milho; Sensoriamento Remoto; Soja; Zea Mays. |
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Thesaurus Nal: |
canopy; lighting; reflectance; remote sensing; soybeans. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03395nam a2200325 a 4500
001 1563857
005 2000-01-12
008 1983 bl uuuu m 00u1 u #d
100 1 $aRANSON, K. J.
245 $aA study of the angular reflectance characteristics of corn and soybean canopies.
260 $a[West Lafayette]: Purdue University$c1983
300 $a168p.
500 $aPh.D. Thesis.
520 $aUnderstanding the characteristic of vegetation canopy reflectance is important if remotely sensed data is to be fully exploited to monitore the amount and status of agricultural resources. Since vegetation canopies are not simple Lambertian reflectors the affects of ilumination and viewing geometry must be understood to enhance the interpretation of the data. In this study the diurnal and seasonal directional reflectance characteristics of two important agricultural crops: corn (Zea mays L.) and soybean (Glycine max (L.) Merr.) were examined. Spectral reflectance factor (RF), agronomic and biophysical measurements were acquired on three dates during 1980 for soybeans and on five dates in 1982 for corn over a wide range of sun and view angles. A pronounced sun-view angle effect on soybean canopy RF was observed, especially in the 0.6 - 0.7 [micron]m (red) wavelength band for canopies with well defined row structure Near infrared (near-IR) RF and the transformed variable greenness showed a less noticeable dependence for both incomplete and complete canopies. The effect of sun angle was greatest for view directions perpendicular to the canopy rows. Analysis of the data for apparent Lambertian behavior yielded very few off- nadir view angles that approximated straigth down measurements for the red band, while near-IR and greenness had extended off-nadir view angle ranges. A geometric optics model was developed to examine the effect of shadows on the red band RF for incomplete soybean canopies. Comparison of modeled and measured results indicated that for nadir view the model explainde up to 95% of the variation in the data. A solar zenith angle dependence for visible, near-IR and middle-IR RFs was noted for corn canopies with a low leaf area index (LAI). A decrease in teh spectral contrast between vegetation and soil due to shadows was cited as the cause of the dependence. Sun angle dependence was least for canopies with higher LAIs. RFs were maximized for coincident sun and view angles and maximized when the sensor view was towards the sun. Evaluation of three linear transformations (greenness, near-IR/red ratio and normalized difference) suggestes they may be useful for correcting the sun angle dependence for nadir acquired data. A strong dependence with view angle was noted for all three transformations for low LAI canopies. Greenness and near-IR/red ratio varied with view zenith angle, normalized difference did not. The asymptotic nature of normalized difference as LAI increases was cited as the reason for the lack of variation with view angle.
650 $acanopy
650 $alighting
650 $areflectance
650 $aremote sensing
650 $asoybeans
650 $aEspectrometria
650 $aGlycine Max
650 $aIluminação
650 $aMilho
650 $aSensoriamento Remoto
650 $aSoja
650 $aZea Mays
653 $aCopa
653 $aMaize
653 $aReflectancia
653 $aSpectrometry
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Registro original: |
Embrapa Cerrados (CPAC) |
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Biblioteca |
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Tipo/Formato |
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Registro |
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Status |
URL |
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| Registros recuperados : 9.568 | |
| 221. |  | ALVES, V. B.; GARCIA, T. C. L.; COSTA, A. de A.; SILVA, J. F. da; CECCON, G. Morfologia de híbridos de milho safrinha, solteiro e consorciado com Brachiaria ruziziensis. In: SEMINÁRIO NACIONAL DE MILHO SAFRINHA, 11, 2011, Lucas do Rio Verde. De safrinha a grande safra: anais. Lucas do Rio Verde: Fundação Rio Verde: ABMS, 2011. 151-158| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 223. | | CECCON, G.; NETO NETO, A. L.; SEREIA, R. C.; ALVES, V. B.; SOARES, R. B. Perda de umidade em grãos de híbridos de milho safrinha, em Dourados MS In: SEMINÁRIO NACIONAL DE MILHO SAFRINHA, 11, 2011, Lucas do Rio Verde. De safrinha a grande safra: anais. Lucas do Rio Verde: Fundação Rio Verde: ABMS, 2011. 189-196| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agropecuária Oeste. |
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| 225. | | ANJOS, J. L. dos; CARVALHO, H. W. L. de; OLIVEIRA, I. R. de; GOMES, J. B. V.; SOBRAL, L. F.; OLIVEIRA, V. D. de. Produtividade de híbridos de milho com espaçamentos de 50, 70 e 90 cm entre linhas e três densidades de plantas na Zona Agreste de Sergipe em 2006. Aracaju, SE: Embrapa Tabuleiros Costeiros, 2008. (Embrapa Tabuleiros Costeiros. Cominicado técnico, 84).| Tipo: Comunicado Técnico/Recomendações Técnicas |
| Biblioteca(s): Embrapa Tabuleiros Costeiros. |
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| 227. | | HELLWIG, L; TRECHA, C. O.; MEDINA, L. B.; FIPKE, M.; BARCELOS, H. T.; ROSA, A. P. S. A. da. Reavaliação do nível de dano de Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) em milho convencional. In: REUNIÃO TÉCNICA ANUAL DO MILHO, 58.; REUNIÃO TÉCNICA ANUAL DO SORGO, 41., 2013, Pelotas. Resumos... Brasília, DF: Embrapa, 2014.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 230. | | BATISTA, F.; OLIVEIRA, M.; FERNANDES, T.; RIBEIRO, V.; MARRIEL, I.; GOMES, E. A.; LANA, U.; OLIVEIRA, C. Quantification of siderophores production by endophytic microorganisms in maize. In: CONGRESO LATINOAMERICANO DE MICROBIOLOGIA, 23.; CONGRESO ARGENTINO DE MICROBIOLOGIA, 14., 2016, Rosário. Resúmenes. Buenos Aires: Asociación Argentina de Microbiología, 2016.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 237. | | EMYGDIO, B. M.; KONFLANZ, V.; TEIXEIRA, M. C. C. Rede Embrapa Sul de híbridos experimentais de milho, Santa Catarina, safra 2007/08. In: REUNIÃO TÉCNICA ANUAL DE MILHO, 53., REUNIÃO TÉCNICA ANUAL DE SORGO, 36., 2008. Pelotas. Atas e resumos... Pelotas: Embrapa Clima Temperado, 2008. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Clima Temperado; Embrapa Trigo. |
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| 238. | | EMYGDIO, B. M.; SILVA, S. D. dos A. e; PORTO, M.; TEIXEIRA, M. C. C.; MEIRELLES, W. F.; KONFLANZ, V.; ACOSTA, A. da S.; ÁVILA, T. T.; SILVA, R. P.; SILVA, A. V. Rede Embrapa Sul de híbridos de milho na região de clima temperado - safra 2006/07. In: REUNIÃO TÉCNICA ANUAL DE MILHO, 52.; REUNIÃO TÉCNICA ANUAL DE SORGO, 35., 2007. Pelotas. Atas e resumos... Pelotas: Embrapa Clima Temperado, 2008. 1 CD-ROM. 4 p.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Trigo. |
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| 239. | | EMYGDIO, B. M.; PORTO, M.; TEIXEIRA, M. C.; MEIRELLES, W. F.; KONFLANZ, V.; PEREIRA, F. R.; TRENTIN, R.; ACOSTA, A. da S.; MACHADO, J. R. de A.; RIGO, F.; HESS, J. Rede Embrapa Sul de híbridos de milho na região de clima temperado - safra 2008/09. In: REUNIÃO TÉCNICA ANUAL DO MILHO, 54.; REUNIÃO TÉCNICA ANUAL DO SORGO, 37., 2009, Veranópolis. Resumos... Porto Alegre: EMATER: FEPAGRO, 2009.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Trigo. |
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| 240. | | EMYGDIO, B. M.; MACHADO, J. R. de A.; FACCHI, L.; FACHINELLO, P. H. K.; BARROS, L. Rede Embrapa Sul de híbridos de milho na região de clima temperado - safra 2012/13. In: REUNIÃO TÉCNICA ANUAL DO MILHO, 58.; REUNIÃO TÉCNICA ANUAL DO SORGO, 41., 2013, Pelotas. Resumos... Brasília, DF: Embrapa, 2014.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| Registros recuperados : 9.568 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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