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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital. |
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Data corrente: |
25/04/2011 |
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Data da última atualização: |
08/07/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
VIEIRA, S. R.; CARVALHO, J. R. P. de; PAZ GONZÁLEZ, A. |
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Afiliação: |
SIDNEY ROSA VIEIRA, IAC; JOSE RUY PORTO DE CARVALHO, CNPTIA; ANTONIO PAZ GONZÁLEZ, Universidade da Coruña, Espanha. |
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Título: |
Jack knifing for semivariogram validation. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Bragantia, Campinas, v. 69, p. 97-105, 2010 |
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Idioma: |
Inglês |
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Notas: |
Suplemento. |
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Conteúdo: |
The semivariogram function fitting is the most important aspect of geostatistics and because of this the model chosen must be validated. Jack knifing may be one the most efficient ways for this validation purpose. The objective of this study was to show the use of the jack knifing technique to validate geostatistical hypothesis and semivariogram models. For that purpose, topographical heights data obtained from six distinct field scales and sampling densities were analyzed. Because the topographical data showed very strong trend for all fields as it was verified by the absence of a sill in the experimental semivariograms, the trend was removed with a trend surface fitted by minimum square deviation. Semivariogram models were fitted with different techniques and the results of the jack knifing with them were compared. The jack knifing parameters analyzed were the intercept, slope and correlation coefficient between measured and estimated values, and the mean and variance of the errors calculated by the difference between measured and estimated values, divided by the square root of the estimation variances. The ideal numbers of neighbors used in each estimation was also studied using the jack knifing procedure. The jack knifing results were useful in the judgment of the adequate models fitted independent of the scale and sampling densities. It was concluded that the manual fitted semivariogram models produced better jack knifing parameters because the user has the freedom to choose a better fit in distinct regions of the semivariogram. MenosThe semivariogram function fitting is the most important aspect of geostatistics and because of this the model chosen must be validated. Jack knifing may be one the most efficient ways for this validation purpose. The objective of this study was to show the use of the jack knifing technique to validate geostatistical hypothesis and semivariogram models. For that purpose, topographical heights data obtained from six distinct field scales and sampling densities were analyzed. Because the topographical data showed very strong trend for all fields as it was verified by the absence of a sill in the experimental semivariograms, the trend was removed with a trend surface fitted by minimum square deviation. Semivariogram models were fitted with different techniques and the results of the jack knifing with them were compared. The jack knifing parameters analyzed were the intercept, slope and correlation coefficient between measured and estimated values, and the mean and variance of the errors calculated by the difference between measured and estimated values, divided by the square root of the estimation variances. The ideal numbers of neighbors used in each estimation was also studied using the jack knifing procedure. The jack knifing results were useful in the judgment of the adequate models fitted independent of the scale and sampling densities. It was concluded that the manual fitted semivariogram models produced better jack knifing parameters because the user has the freedom to c... Mostrar Tudo |
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Palavras-Chave: |
Erro reduzido; Estacionaridade; Semivariograms; Stationarity. |
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Thesagro: |
Topografia. |
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Thesaurus Nal: |
Topography. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/33101/1/Jack2.pdf
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Marc: |
LEADER 02167naa a2200229 a 4500
001 1886773
005 2011-07-08
008 2010 bl uuuu u00u1 u #d
100 1 $aVIEIRA, S. R.
245 $aJack knifing for semivariogram validation.$h[electronic resource]
260 $c2010
500 $aSuplemento.
520 $aThe semivariogram function fitting is the most important aspect of geostatistics and because of this the model chosen must be validated. Jack knifing may be one the most efficient ways for this validation purpose. The objective of this study was to show the use of the jack knifing technique to validate geostatistical hypothesis and semivariogram models. For that purpose, topographical heights data obtained from six distinct field scales and sampling densities were analyzed. Because the topographical data showed very strong trend for all fields as it was verified by the absence of a sill in the experimental semivariograms, the trend was removed with a trend surface fitted by minimum square deviation. Semivariogram models were fitted with different techniques and the results of the jack knifing with them were compared. The jack knifing parameters analyzed were the intercept, slope and correlation coefficient between measured and estimated values, and the mean and variance of the errors calculated by the difference between measured and estimated values, divided by the square root of the estimation variances. The ideal numbers of neighbors used in each estimation was also studied using the jack knifing procedure. The jack knifing results were useful in the judgment of the adequate models fitted independent of the scale and sampling densities. It was concluded that the manual fitted semivariogram models produced better jack knifing parameters because the user has the freedom to choose a better fit in distinct regions of the semivariogram.
650 $aTopography
650 $aTopografia
653 $aErro reduzido
653 $aEstacionaridade
653 $aSemivariograms
653 $aStationarity
700 1 $aCARVALHO, J. R. P. de
700 1 $aPAZ GONZÁLEZ, A.
773 $tBragantia, Campinas$gv. 69, p. 97-105, 2010
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Registro original: |
Embrapa Agricultura Digital (CNPTIA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
25/02/2011 |
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Data da última atualização: |
23/03/2011 |
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Tipo da produção científica: |
Capítulo em Livro Técnico-Científico |
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Autoria: |
TORRES, E.; DEBIASI, H.; FRANCHINI, J. C.; SARAIVA, O. F.; ALMEIDA, A. M. R. |
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Afiliação: |
ELENO TORRES, Pesquisador aposentado da Embrapa Soja; HENRIQUE DEBIASI, CNPSO; JULIO CEZAR FRANCHINI DOS SANTOS, CNPSO; ODILON FERREIRA SARAIVA, CNPSO; ALVARO MANUEL RODRIGUES ALMEIDA, CNPSO. |
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Título: |
Manejo do solo na prevenção de doenças radiculares. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: ALMEIDA, A. M. R.; SEIXAS, C. D. S. (Ed.). Soja: doenças radiculares e de hastes e inter-relações com o manejo do solo e da cultura. Londrina: Embrapa Soja, 2010. |
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Páginas: |
p. 207-279. |
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Descrição Física: |
il. |
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Idioma: |
Português |
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Conteúdo: |
Importância das propriedades do solo e do seu manejo. Sistemas de manejo do solo no cultivo da soja e doenças radiculares. Sistemas de manejo da cultura: rotação de culturas, cobertura do solo e doenças radiculares. Sistemas de manejo do solo, propriedades físicas do solo e doenças. Sistemas de manejo e as características químicas do solo. Importância da adoção de sistemas conservacionistas. |
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Thesagro: |
Doença de planta; Prática cultural; Soja. |
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Thesaurus NAL: |
Plant cultural practices; Plant diseases and disorders; Soybeans. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01209naa a2200253 a 4500
001 1879030
005 2011-03-23
008 2010 bl uuuu u00u1 u #d
100 1 $aTORRES, E.
245 $aManejo do solo na prevenção de doenças radiculares.
260 $c2010
300 $ap. 207-279.$cil.
520 $aImportância das propriedades do solo e do seu manejo. Sistemas de manejo do solo no cultivo da soja e doenças radiculares. Sistemas de manejo da cultura: rotação de culturas, cobertura do solo e doenças radiculares. Sistemas de manejo do solo, propriedades físicas do solo e doenças. Sistemas de manejo e as características químicas do solo. Importância da adoção de sistemas conservacionistas.
650 $aPlant cultural practices
650 $aPlant diseases and disorders
650 $aSoybeans
650 $aDoença de planta
650 $aPrática cultural
650 $aSoja
700 1 $aDEBIASI, H.
700 1 $aFRANCHINI, J. C.
700 1 $aSARAIVA, O. F.
700 1 $aALMEIDA, A. M. R.
773 $tIn: ALMEIDA, A. M. R.; SEIXAS, C. D. S. (Ed.). Soja: doenças radiculares e de hastes e inter-relações com o manejo do solo e da cultura. Londrina: Embrapa Soja, 2010.
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Registro original: |
Embrapa Soja (CNPSO) |
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Tipo/Formato |
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Registro |
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Registro completo
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Biblioteca(s): |
Catálogo Coletivo de Periódicos Embrapa; Embrapa Soja. |
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Identificador: |
2011 |
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Data corrente: |
09/05/2002 |
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Data da última atualização: |
09/05/2002 |
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Código do título: |
3000104 |
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ISSN: |
0439-3600 |
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Título e Subtítulo: |
BULLETIN OF THE HOKURIKU NATIONAL AGRICULTURAL EXPERIMENT STATION |
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Entidade: |
Hokoriku National Agricultural Experiment Station |
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Local de publicação: |
Niigata-Japao |
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Periodicidade: |
trimestral |
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Coleções da unidade: |
Embrapa Soja
1976 (19); 1977 (20); 1978 (21); 1979 (22); 1981 (23); 1982 (24); 1983 (25); 1984 (26); 1985 (27); 1986 (28); 1987 (29); 1989 (30-31); 1990 (32); 1991 (33); 1992 (34); 1993 (35); 1994 (36); 1995 (37); 1996 (38); 1997 (39-41); 2000 (42-43); 2001 (44) Indice 1960/2001 1-44
Classificação: 630.5 |
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