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| Registros recuperados : 15 | |
| 1. |  | BECKER, F. S.; EIFERT, E. da C.; SOARES JUNIOR, M. S.; TAVARES, J. A. S.; CARVALHO, A. V. Mudanças químicas e viscoamilográficas em farinhas de diferentes genótipos de arroz submetidas à extrusão. Ciência Rural, Santa Maria, RS, v. 43, n. 10, p. 1911-1917, out. 2013.| Biblioteca(s): Epagri-Sede. |
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| 2. | | COUTINHO, J. L. B.; TAVARES, J. A.; SANTOS, V. F. dos; SANTOS, R. C. dos; CARVALHO NETO, A. de. Estabilidade e adaptabilidade de genotipos de amendoim (Arachis hypogene L.) na chapada do Araripe, em Pernambuco. Pesquisa Agropecuaria Penambucana, Recife, v. 13, n. especial, p. 17-24, jan./dez. 2002.| Biblioteca(s): Epagri-Sede. |
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| 3. | | COUTINHO, J. L. B>; TAVARES, J. A>; SANTOS, V. F. dos; SANTOS, R. C. dos; CARVALHO NETO, A. de. Estabilidade e adaptabilidade de genotipos de amendoim (Arachis hypogene L.) para a chapada do Araripe, em Pernambuco. I. resultados. Pesquisa Agropecuaria Penambucana, Recife, v. 13, n. especial, p. 25-33, jan./dez. 2002.| Biblioteca(s): Epagri-Sede. |
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| 4. | | FUKUDA, W. M. G.; CALDAS, R. C.; MAGALHAES, J. A.; CAVALCANTI, J.; TAVARES, J. A.; IGLESIAS, C.; ROMERO, L. A. H. Analise de estabilidade de variedades de mandioca selecionadas em provas participativas com produtores do semi-arido do nordeste do Brasil. Revista Brasileira de Mandioca, Cruz das Almas, v. 18, n. 1, p. 13-18, out. 2005.| Biblioteca(s): Epagri-Sede. |
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| 6. | | FUKUDA, W.M.G.; FUKUDA, C.; CALDAS, R.C.; CAVALCANTI, J.; TAVARES, J.A.; MAGALHAES, J.A.; NUNES, L.C. Avaliacao e selecao de variedades de mandioca com a participacao de agricultores do semi-arido do nordeste brasileiro. Cruz das Almas, BA: Embrapa Mandioca e Fruticultura, 2000. 42p. (Embrapa Mandioca e Fruticultura. Boletim de Pesquisa, 18).| Biblioteca(s): Epagri-Sede. |
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| 7. | | FUKUDA, W.M.G.; MAGALHAES, J.A.; CAVALCANTI, J.; PINA, P.R.; TAVARES, J.A.; IGLESIAS, C.; ROMERO, L.A.H.; MONTENEGRO, E.E. Pesquisa participativa em melhoramento de mandioca: uma experiencia no semi-arido do Nordeste do Brasil. Cruz das Almas,BA: EMBRAPA-CNPMF, 1997. 46p. il. (EMBRAPA-CNPMF. Documentos, 73).| Biblioteca(s): Epagri-Sede. |
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| 8. | | GADELHA, F. H. de L.; SILVA, J. A. A. da; FERREIRA, R. L. C.; MELO, I. V. de; JORGE, D. L.; TAVARES, J. A.; SILVA, S. P. R. da. Rendimento volumétrico e energético de clones de híbridos de Eucalyptussp. no polo gesseiro do Araripe, PE.
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FERNANDO HENRIQUE DE LIMA GADELHA, JOSÉ ANTÔNIO ALEIXO DA SILVA, JOSÉ ANTÔNIO ALEIXO DA SILVA, RINALDO LUIZ CARACIOLO FERREIRA, RINALDO LUIZ CARACIOLO FERREIRA, IVAN VIEIRA DE MELO, IVAN VIEIRA DE MELO, DANILLO LOBO JORGE, DANILLO LOBO JORGE, JOSÉ ALVES TAVARES, JOSÉ ALVES TAVARES, SERGIO PERES RAMOS DA SILVA, SERGIO PERES RAMOS DA SILVA Ciência Florestal, Santa Maria, RS, v. 22, n. 2, p. 331-341, abr./jun. 2012.| Biblioteca(s): Epagri-Sede. |
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| 9. | | GOMES, R. V.; TABOSA, J. N.; SIMÕES, A. L.; CAVALCANTI, F. J. de A.; LIRA, M. de A.; REIS, O. V. dos; LIMA, G. S. de; TAVARES, J. A. Utilização do calcário + gesso em solos ácidos da chapa do araripe-pe, na cultura do sorgo granífero. Pesquisa Agropecuária Pernambucana, Recife, PE, v. 11, n. especial, p. 25-37, jan./dez. 1997.| Biblioteca(s): Epagri-Sede. |
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| 10. | | MIRANDA, P.; COSTA, A. F. da C.; TAVARES, J. A.; RAPOSO, J. A de A.; BARROS, E. O. de C.; PIMENTEL, M. de L.; SANTOS, V. F. dos. Avaliação de cultivares de (Vigna unguiculata (L.) walp.), tipos ereto e semi-ereto em diferentes ambientes agroecológicos de Pernambuco. Pesquisa Agropecuária Pernambucana, Recife, PE, v. 11, n. especial, p. 47-51, jan./dez. 1998-1999.| Biblioteca(s): Epagri-Sede. |
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| 11. | | MIRANDA, P.; COSTA, A. F. da; OLIVEIRA, L. R. de; TAVARES, J. A.; PIMENTEL, M. de L. Avaliação de cultivares de Vigna unguiculata (L.) walp., tipo ramador, nos sistemas solteiro e consorciado. Pesquisa Agropecuária Pernambucana, Recife, PE, v. 11, n. especial, p. 45-53, jan./dez. 1997.| Biblioteca(s): Epagri-Sede. |
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| 12. | | MIRANDA, P.; COSTA, A. F. da; OLIVEIRA, L. R. de; TAVARES, J. A.; PIMENTEL, M. de L.; SANTOS, V. F. dos. Competição de cultivares de feijoeiro macassar, tipo ramador e semi-ramador, em Pernambuco. Pesquisa Agropecuária Pernambucana, Recife, PE, v. 11, n. especial, p. 61-67, jan./dez. 1998-1999.| Biblioteca(s): Epagri-Sede. |
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| 13. | | MIRANDA, P.; COSTA, A. F. da; OLIVEIRA, L. R. de; TAVARES,J. A.; PIMENTEL, M. de L.; LINS, G. M. de L. Comportamento de cultivares de vigna unguiculata (L.) walp.; nos sistemas solteiro e consorciado. III - tipo ramador. Pesquisa Agropecuária Pernambucana, Recife, PE, v. 11, n. especial, p. 67-76, jan./dez. 1997.| Biblioteca(s): Epagri-Sede. |
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| 14. | | MIRANDA, P.; COSTA, A. F. da; OLIVEIRA, L. R. de; TAVARES, J. A.; PIMENTEL, M. de L.; LINS, G. M. de L. Comportamento de cultivares de (Vigna unguiculata (L.) walp.), nos sistemas solteiro e consorciado. VI - tipos ereto e semi-ereto. Pesquisa Agropecuária Pernambucana, Recife, PE, v. 11, n. especial, p. 77-83, jan./dez. 1998-1999.| Biblioteca(s): Epagri-Sede. |
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| Registros recuperados : 15 | |
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Registro Completo
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
12/04/2016 |
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Data da última atualização: |
12/04/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - B |
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Autoria: |
EBERHARDT, I. D. R.; SCHULTZ, B.; RIZZI, R.; SANCHES, I. D.; FORMAGGIO, A. R.; ATZBERGER, C.; MELLO, M. P.; IMMITZER, M.; TRABAQUINI, K.; FOSCHIERA, W.; LUIZ, A. J. B. |
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Título: |
Cloud Cover Assessment for Operational Crop Monitoring Systems in Tropical Areas. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Remote Sensing, Suiça, v. 8, n. 3, p. 219-233, 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
The potential of optical remote sensing data to identify, map and monitor croplands is well recognized. However, clouds strongly limit the usefulness of optical imagery for these applications. This paper aims at assessing cloud cover conditions over four states in the tropical and sub-tropical Center-South region of Brazil to guide the development of an appropriate agricultural monitoring system based on Landsat-like imagery. Cloudiness was assessed during overlapping four months periods to match the typical length of crop cycles in the study area. The percentage of clear sky occurrence was computed from the 1 km resolution MODIS Cloud Mask product (MOD35) considering 14 years of data between July 2000 and June 2014. Results showed high seasonality of cloud occurrence within the crop year with strong variations across the study area. The maximum seasonality was observed for the two states in the northern part of the study area (i.e., the ones closer to the Equator line), which also presented the lowest averaged values (15%) of clear sky occurrence during the main (summer) cropping period (November to February). In these locations, optical data faces severe constraints for mapping summer crops. On the other hand, relatively favorable conditions were found in the southern part of the study region. In the South, clear sky values of around 45% were found and no significant clear sky seasonality was observed. Results underpin the challenges to implement an operational crop monitoring system based solely on optical remote sensing imagery in tropical and sub-tropical regions, in particular if short-cycle crops have to be monitored during the cloudy summer months. To cope with cloudiness issues, we recommend the use of new systems with higher repetition rates such as Sentinel-2. For local studies, Unmanned Aircraft Vehicles (UAVs) might be used to augment the observing capability. Multi-sensor approaches combining optical and microwave data can be another option. In cases where wall-to-wall maps are not mandatory, statistical sampling approaches might also be a suitable alternative for obtaining useful crop area information. MenosThe potential of optical remote sensing data to identify, map and monitor croplands is well recognized. However, clouds strongly limit the usefulness of optical imagery for these applications. This paper aims at assessing cloud cover conditions over four states in the tropical and sub-tropical Center-South region of Brazil to guide the development of an appropriate agricultural monitoring system based on Landsat-like imagery. Cloudiness was assessed during overlapping four months periods to match the typical length of crop cycles in the study area. The percentage of clear sky occurrence was computed from the 1 km resolution MODIS Cloud Mask product (MOD35) considering 14 years of data between July 2000 and June 2014. Results showed high seasonality of cloud occurrence within the crop year with strong variations across the study area. The maximum seasonality was observed for the two states in the northern part of the study area (i.e., the ones closer to the Equator line), which also presented the lowest averaged values (15%) of clear sky occurrence during the main (summer) cropping period (November to February). In these locations, optical data faces severe constraints for mapping summer crops. On the other hand, relatively favorable conditions were found in the southern part of the study region. In the South, clear sky values of around 45% were found and no significant clear sky seasonality was observed. Results underpin the challenges to implement an operational crop monito... Mostrar Tudo |
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Palavras-Chave: |
agriculture monitoring; clear sky coverage; crop classification; MODIS. |
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Categoria do assunto: |
Z Localizações Geográficas |
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Marc: |
LEADER 02971naa a2200289 a 4500
001 1124955
005 2016-04-12
008 2016 bl uuuu u00u1 u #d
100 1 $aEBERHARDT, I. D. R.
245 $aCloud Cover Assessment for Operational Crop Monitoring Systems in Tropical Areas.$h[electronic resource]
260 $c2016
520 $aThe potential of optical remote sensing data to identify, map and monitor croplands is well recognized. However, clouds strongly limit the usefulness of optical imagery for these applications. This paper aims at assessing cloud cover conditions over four states in the tropical and sub-tropical Center-South region of Brazil to guide the development of an appropriate agricultural monitoring system based on Landsat-like imagery. Cloudiness was assessed during overlapping four months periods to match the typical length of crop cycles in the study area. The percentage of clear sky occurrence was computed from the 1 km resolution MODIS Cloud Mask product (MOD35) considering 14 years of data between July 2000 and June 2014. Results showed high seasonality of cloud occurrence within the crop year with strong variations across the study area. The maximum seasonality was observed for the two states in the northern part of the study area (i.e., the ones closer to the Equator line), which also presented the lowest averaged values (15%) of clear sky occurrence during the main (summer) cropping period (November to February). In these locations, optical data faces severe constraints for mapping summer crops. On the other hand, relatively favorable conditions were found in the southern part of the study region. In the South, clear sky values of around 45% were found and no significant clear sky seasonality was observed. Results underpin the challenges to implement an operational crop monitoring system based solely on optical remote sensing imagery in tropical and sub-tropical regions, in particular if short-cycle crops have to be monitored during the cloudy summer months. To cope with cloudiness issues, we recommend the use of new systems with higher repetition rates such as Sentinel-2. For local studies, Unmanned Aircraft Vehicles (UAVs) might be used to augment the observing capability. Multi-sensor approaches combining optical and microwave data can be another option. In cases where wall-to-wall maps are not mandatory, statistical sampling approaches might also be a suitable alternative for obtaining useful crop area information.
653 $aagriculture monitoring
653 $aclear sky coverage
653 $acrop classification
653 $aMODIS
700 1 $aSCHULTZ, B.
700 1 $aRIZZI, R.
700 1 $aSANCHES, I. D.
700 1 $aFORMAGGIO, A. R.
700 1 $aATZBERGER, C.
700 1 $aMELLO, M. P.
700 1 $aIMMITZER, M.
700 1 $aTRABAQUINI, K.
700 1 $aFOSCHIERA, W.
700 1 $aLUIZ, A. J. B.
773 $tRemote Sensing, Suiça$gv. 8, n. 3, p. 219-233, 2016.
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