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| Registros recuperados : 71 | |
| 4. |  | SILVA, L. O. C. da; TSURUTA, S.; BERTRAND, J. K.; GONDO, A.; JOSAHKIAN, L. A. Performance group in G X E study for genetic evaluation of growth in Brazillian Nellore. In: ADSA-PSA-AMPA-ASAS JOINT ANNUAL MEETING, 2009, Montreal. Abstracts. Montreal: ADSA: ASAS, 2009. Disponível em:< http://adsa.asas.org/meetings/2009/abstracts/toc.htm > Acesso em: 15 dez. 2009. Publicado em: Journal of Animal Science, Champaign, v. 87, E-Supplement 2/J; Journal of Dairy Science, Champaign, v. 92, E-Supplement 1. p. 18. Breeding and Genetics : Poultry Breeding, and Genetics of Disease. 1 p. Trabalho M.48.| Biblioteca(s): Embrapa Gado de Corte. |
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| 6. | | MARTIN NIETO, L.; SILVA, L. O. C. da; ROSA, A. do N.; TORRES JÚNIOR, R. A. de A.; GONDO, A. Análise da curva de crescimento do perímetro escrotal de touros Canchim em diferentes sistemas de criação. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e a segurança alimentar: anais dos simpósios e dos resumos. Campo Grande, MS: Sociedade Brasileira de Zootecnia: Embrapa Gado de Corte, 2004. 4 p. MELH 122. 1 CD-ROM. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 8. | | PAYÁ, S. B.; FERRAZ FILHO, P. B.; SILVA, L. O. C. da; SOUZA, J. L. de; GONDO, A. Análise da variação ambiental e genética dos pesos à desmama de bovinos da raça Nelore mocha, nas mega-regiões Campinas e Ribeirão Preto. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e a segurança alimentar: anais dos simpósios e dos resumos. Campo Grande, MS: Sociedade Brasileira de Zootecnia: Embrapa Gado de Corte, 2004. 5 p. MELH 196. 1 CD-ROM. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 9. | | TORAL, F. L. B.; SILVA, L. O. C. da; MARTINS, E. N.; GONDO, A.; SIMONELLI, S. M. Interação genótipo x ambiente em características de crescimento de bovinos da raça Nelore no Mato Grosso do Sul. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e a segurança alimentar: anais dos simpósios e dos resumos. Campo Grande, MS: Sociedade Brasileira de Zootecnia: Embrapa Gado de Corte, 2004. 5 p. MELH 060. 1 CD-ROM. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 10. | | LIMA, A. P. M.; FERRAZ FILHO, P. B.; SILVA, L. O. C. da; SOUZA, J. C. de; GONDO, A. Influência de fatores de meio sobre peso a desmama e pós-desmama de bovinos da raça Nelore mocha, em três regiões do Nordeste brasileiro. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e a segurança alimentar: anais dos simpósios e dos resumos. Campo Grande, MS: Sociedade Brasileira de Zootecnia: Embrapa Gado de Corte, 2004. 3 p. MELH 009. 1 CD-ROM. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 11. | | CARDOSO, L. A. V.; SILVA, L. O. C. da; GONDO, A.; ROSA, A. do N.; PEREIRA, M. F. Tendências genéticas do rebanho nelore po da embrapa gado de corte. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 1., 2005, Campo Grande, MS: Embrapa Gado de Corte, 2005. 1 p.| Biblioteca(s): Embrapa Gado de Corte. |
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| 15. | | MARICLE, E. A.; SOUZA, J. C.; SILVA, L. O. C; GONDO, A.; WEABER, R. L.; LAMBERSON, W. R. Genotype by environment interactions estimated by using reaction norms in Brazilian Nellore cattle. In: ADSA-PSA-AMPA-ASAS JOINT ANNUAL MEETING, 2007, San Antonio. Abstracts. 2007. Disponível em: Acesso em: 5 mar. 2008. 1 p. Publicado em: Journal of Animal Science, Champaign, v. 85, suppl. 1; Journal of Dairy Science, Champaign, v. 90, supp.1; Poultry Science, Champaign, v. 86, supp. 1, p. 190, 2007. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 16. | | SILVA, L. O. C. da; MARTIN NIETO, L.; GONDO, A.; NOBRE, P. R. C.; ALMEIDA JÚNIOR, R. T. Descrição da curva de crescimento da circunferência escrotal em touros Canchim empregando modelos não lineares. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 40., 2003, Santa Maria, RS. Otimizando a produção animal: anais. Santa Maria, RS: SBZ, 2003. 4 p. 1 CD-ROM. Melhoramento animal. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 17. | | SILVA, L. O. C. da; TSURUTA, S.; TORRES JUNIOR, R. A. de A.; BERTRAND, J. K.; GONDO, A.; NOBRE, P. R. C.; JOSAHKIAN, L. A. Alternativas para manejar dados relacionados à idade ao primeiro parto em Nelore, quando se pretende estimar parâmetros genéticos. In: REUNIÓN BIENAL [DE LA] ASOCIACIÓN LATINOAMERICANA DE PRODUCCIÓN ANIMAL, 21., 2009, San Juan. Producción animal em tiempos de crisis: memórias... San Juan: ALPA, 2009. p. 106-110 (GFR-19C).| Biblioteca(s): Embrapa Gado de Corte. |
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| 18. | | SILVA, L. O. C.; TSURUTA, S.; BERTRAND, J. K.; GONDO, A.; NOBRE, P. R. C.; TORRES JÚNIOR, R. A. A.; MACHADO, C. H. C. An approach for considering genotype x environment interaction in the genetic evaluations of Zebu beef cattle in Brazil. In: ADSA-PSA-AMPA-ASAS JOINT ANNUAL MEETING, 2008, Indianapolis. Abstracts. Indianapolis: ADSA: ASAS, 2008. Disponível em:< http://adsa.asas.org/meetings/2008/abstracts/TOC.htm > Acesso em: 26 mar. 2009. Publicado em: Journal of Animal Science, Champaign, v. 86, E-Supplement 2; Journal of Dairy Science, Champaign, v. 91, E-Supplement 1. p. 207 1 CD-ROM. Breeding and Genetics II. O202. Trabalho W46.| Biblioteca(s): Embrapa Gado de Corte. |
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| 19. | | MENEZES, G. R. de; TORRES, R. A.; TORRES JUNIOR, R. A. de A.; SILVA, L. O. C. da; GONDO, A.; EUCLYDES, R. F. Polinômios segmentados lineares do tipo b na modelagem de dados longitudinais de ponderal em bovinos da raça tabapuã. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 6., 2010, Campo Grande, MS. Ética na pesquisa científica: [Anais da ...]. Campo Grande, MS: Embrapa Gado de Corte, 2010. 1 CD-ROM. Coordenadora: Vanessa Felipe de Souza 1 p.| Biblioteca(s): Embrapa Gado de Corte. |
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| 20. | | SOUZA, J. C.; SILVA, L. O. C. da; GONDO, A.; FERRAZ FILHO, P. B.; FREITAS, J. A.; MALHADO, C. H. M.; WEABER, R. L.; LAMBERSON, W, L. Principal component analysis of traits contributing to genetic evaluation of Brahman bulls in Brazil. In: ADSA-PSA-AMPA-ASAS JOINT ANNUAL MEETING, 2010, Denver. [Abstracts]. Publicado em: Journal of Animal Science, Champaign, v. 88, E-Supplement 2/J; Journal of Dairy Science, Champaign, v. 93, E-Supplement 1.; Journal of Poultry Science, v.89, E- Supplement 1. 1 p. Trabalho M79.| Biblioteca(s): Embrapa Gado de Corte. |
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| Registros recuperados : 71 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
08/09/2020 |
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Data da última atualização: |
08/09/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 4 |
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Autoria: |
RODRIGUES, H. M.; VASQUES, G. de M.; OLIVEIRA, R. P. de; TAVARES, S. R. de L.; CEDDIA, M. B.; HERNANI, L. C. |
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Afiliação: |
HUGO MACHADO RODRIGUES, UFRRJ; GUSTAVO DE MATTOS VASQUES, CNPS; RONALDO PEREIRA DE OLIVEIRA, CNPS; SILVIO ROBERTO DE LUCENA TAVARES, CNPS; MARCOS BACIS CEDDIA, UFRRJ; LUIS CARLOS HERNANI, CNPS. |
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Título: |
Finding suitable transect spacing and sampling designs for accurate soil ECa mapping from EM38-MK2. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Soil Systems, v. 4, n. 3, 56, 2020. |
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DOI: |
https://doi.org/10.3390/soilsystems4030056 |
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Idioma: |
Inglês |
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Conteúdo: |
Finding an ideal sampling design is a crucial stage in detailed soil mapping to assure reasonable accuracy of resulting soil property maps. This study aimed to evaluate the influence of sampling designs and sample sizes on the quality of soil apparent electrical conductivity (ECa) maps from an electromagnetic sensor survey. Twenty-six (26) parallel transects were gathered in a 72-ha plot in Southeastern Brazil. Soil ECa measurements using an on-the-go electromagnetic induction sensor were taken every second using sensor vertical orientation. Two approaches were used to reduce the sample size and simulate kriging interpolations of soil ECa. Firstly, the number of transect lines was reduced by increasing the distance between them; thus, 26 transects with 40 m spacing; 13 with 80 m; 7 with 150 m; and 4 with 300 m. Secondly, random point selection and Douglas-Peucker algorithms were used to derive four reduced datasets by removing 25, 50, 75, and 95% of the points from the ECa survey dataset. Soil ECa was interpolated at 5 m output spatial resolution using ordinary kriging and the four datasets from each simulation (a total of twelve datasets). Map uncertainty was assessed by root mean square error and mean error metrics from 400 random samples previously selected for external map validation. Maps were evaluated on their uncertainty and spatial structure of variation. The transect elimination approach showed that maps produced with transect spacing up to 150 m could preserve the spatial structure of ECa variations. Douglas-Peucker results showed lower nugget values than random point simulations for all selected sample densities, except for a 95% point reduction. The soil ECa maps derived from the 75% reduced dataset (by random sampling or Douglas-Peucker) or from 13 transect lines (80 m spacing) showed reasonable accuracy (RMSE of validation circa 0.7) relative to the map interpolated from all survey points (RMSE of 0.5), suggesting that transect spacing of 80 m and reading intervals greater than one second can be used for improving the efficiency of on-the-go soil ECa surveys. MenosFinding an ideal sampling design is a crucial stage in detailed soil mapping to assure reasonable accuracy of resulting soil property maps. This study aimed to evaluate the influence of sampling designs and sample sizes on the quality of soil apparent electrical conductivity (ECa) maps from an electromagnetic sensor survey. Twenty-six (26) parallel transects were gathered in a 72-ha plot in Southeastern Brazil. Soil ECa measurements using an on-the-go electromagnetic induction sensor were taken every second using sensor vertical orientation. Two approaches were used to reduce the sample size and simulate kriging interpolations of soil ECa. Firstly, the number of transect lines was reduced by increasing the distance between them; thus, 26 transects with 40 m spacing; 13 with 80 m; 7 with 150 m; and 4 with 300 m. Secondly, random point selection and Douglas-Peucker algorithms were used to derive four reduced datasets by removing 25, 50, 75, and 95% of the points from the ECa survey dataset. Soil ECa was interpolated at 5 m output spatial resolution using ordinary kriging and the four datasets from each simulation (a total of twelve datasets). Map uncertainty was assessed by root mean square error and mean error metrics from 400 random samples previously selected for external map validation. Maps were evaluated on their uncertainty and spatial structure of variation. The transect elimination approach showed that maps produced with transect spacing up to 150 m could preserve the... Mostrar Tudo |
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Palavras-Chave: |
Geoestatística; Incerteza; Krigagem; Sensoriamento proximal do solo. |
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Thesagro: |
Sensoriamento Remoto. |
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Thesaurus NAL: |
Geostatistics; Kriging; Remote sensing; Uncertainty. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/215820/1/Finding-suitable-transect-spacing-and-sampling-designs-for-accurate-soil-2020.pdf
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Marc: |
LEADER 03005naa a2200301 a 4500
001 2124782
005 2020-09-08
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.3390/soilsystems4030056$2DOI
100 1 $aRODRIGUES, H. M.
245 $aFinding suitable transect spacing and sampling designs for accurate soil ECa mapping from EM38-MK2.$h[electronic resource]
260 $c2020
520 $aFinding an ideal sampling design is a crucial stage in detailed soil mapping to assure reasonable accuracy of resulting soil property maps. This study aimed to evaluate the influence of sampling designs and sample sizes on the quality of soil apparent electrical conductivity (ECa) maps from an electromagnetic sensor survey. Twenty-six (26) parallel transects were gathered in a 72-ha plot in Southeastern Brazil. Soil ECa measurements using an on-the-go electromagnetic induction sensor were taken every second using sensor vertical orientation. Two approaches were used to reduce the sample size and simulate kriging interpolations of soil ECa. Firstly, the number of transect lines was reduced by increasing the distance between them; thus, 26 transects with 40 m spacing; 13 with 80 m; 7 with 150 m; and 4 with 300 m. Secondly, random point selection and Douglas-Peucker algorithms were used to derive four reduced datasets by removing 25, 50, 75, and 95% of the points from the ECa survey dataset. Soil ECa was interpolated at 5 m output spatial resolution using ordinary kriging and the four datasets from each simulation (a total of twelve datasets). Map uncertainty was assessed by root mean square error and mean error metrics from 400 random samples previously selected for external map validation. Maps were evaluated on their uncertainty and spatial structure of variation. The transect elimination approach showed that maps produced with transect spacing up to 150 m could preserve the spatial structure of ECa variations. Douglas-Peucker results showed lower nugget values than random point simulations for all selected sample densities, except for a 95% point reduction. The soil ECa maps derived from the 75% reduced dataset (by random sampling or Douglas-Peucker) or from 13 transect lines (80 m spacing) showed reasonable accuracy (RMSE of validation circa 0.7) relative to the map interpolated from all survey points (RMSE of 0.5), suggesting that transect spacing of 80 m and reading intervals greater than one second can be used for improving the efficiency of on-the-go soil ECa surveys.
650 $aGeostatistics
650 $aKriging
650 $aRemote sensing
650 $aUncertainty
650 $aSensoriamento Remoto
653 $aGeoestatística
653 $aIncerteza
653 $aKrigagem
653 $aSensoriamento proximal do solo
700 1 $aVASQUES, G. de M.
700 1 $aOLIVEIRA, R. P. de
700 1 $aTAVARES, S. R. de L.
700 1 $aCEDDIA, M. B.
700 1 $aHERNANI, L. C.
773 $tSoil Systems$gv. 4, n. 3, 56, 2020.
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