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Registro Completo |
Biblioteca(s): |
Embrapa Solos. |
Data corrente: |
08/09/2020 |
Data da última atualização: |
08/09/2020 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
RODRIGUES, H. M.; VASQUES, G. de M.; OLIVEIRA, R. P. de; TAVARES, S. R. de L.; CEDDIA, M. B.; HERNANI, L. C. |
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. |
Título: |
Finding suitable transect spacing and sampling designs for accurate soil ECa mapping from EM38-MK2. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Soil Systems, v. 4, n. 3, 56, 2020. |
DOI: |
https://doi.org/10.3390/soilsystems4030056 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Geoestatística; Incerteza; Krigagem; Sensoriamento proximal do solo. |
Thesagro: |
Sensoriamento Remoto. |
Thesaurus Nal: |
Geostatistics; Kriging; Remote sensing; Uncertainty. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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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Embrapa Solos (CNPS) |
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Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
12/12/2013 |
Data da última atualização: |
18/11/2022 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
SANTOS, K. C. L. dos; ARBEX, W. A.; SILVA, M. V. G. B.; MARTINS, M. F.; FONSECA, I.; SANTOS, D. J. de A. dos. |
Afiliação: |
KATIA CRISTINA LAGE DOS SANTOS, CNPGL; WAGNER ANTONIO ARBEX, CNPGL; MARCOS VINICIUS GUALBERTO B SILVA, CNPGL; MARTA FONSECA MARTINS, CNPGL; ISABELA FONSECA, UFV; DANIEL JORDAN DE ABREU DOS SANTOS, UNESP. |
Título: |
Sistema de armazenamento para a organização e o controle do banco de DNA de bovinos de leite. |
Ano de publicação: |
2013 |
Fonte/Imprenta: |
In: CONGRESSO INTERNACIONAL DO LEITE, 12.; WORKSHOP DE POLÍTICAS PÚBLICAS, 12.; SIMPÓSIO DE SUSTENTABILIDADE DA ATIVIDADE LEITEIRA, 13., 2013, Porto Velho. Anais... Brasília, DF: Embrapa, 2013. |
Páginas: |
3 p. |
Descrição Física: |
1 CD-ROM. |
Idioma: |
Português |
Palavras-Chave: |
Confiabilidade; Disponibilidade; Modelo de dados relacional. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/93905/1/819-Arbex.pdf
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Marc: |
LEADER 00808nam a2200205 a 4500 001 1973683 005 2022-11-18 008 2013 bl uuuu u00u1 u #d 100 1 $aSANTOS, K. C. L. dos 245 $aSistema de armazenamento para a organização e o controle do banco de DNA de bovinos de leite.$h[electronic resource] 260 $aIn: CONGRESSO INTERNACIONAL DO LEITE, 12.; WORKSHOP DE POLÍTICAS PÚBLICAS, 12.; SIMPÓSIO DE SUSTENTABILIDADE DA ATIVIDADE LEITEIRA, 13., 2013, Porto Velho. Anais... Brasília, DF: Embrapa$c2013 300 $a3 p.$c1 CD-ROM. 653 $aConfiabilidade 653 $aDisponibilidade 653 $aModelo de dados relacional 700 1 $aARBEX, W. A. 700 1 $aSILVA, M. V. G. B. 700 1 $aMARTINS, M. F. 700 1 $aFONSECA, I. 700 1 $aSANTOS, D. J. de A. dos
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