| |
|
|
|
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
|
|
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.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Solos (CNPS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
|
Data corrente: |
13/12/2007 |
|
Data da última atualização: |
24/08/2011 |
|
Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
|
Autoria: |
OLIVEIRA, M. C. de S.; CHAGAS, A. C. de S.; FORIM, M.; SILVA, M. F.; GIGLIOTI, R.; CARVALHO, C. O. |
|
Afiliação: |
MARCIA CRISTINA DE SENA OLIVEIRA, CPPSE; ANA CAROLINA DE SOUZA CHAGAS, CPPSE; MOACIR FORIM, UFSCar/SÃO CARLOS, SP.; UFSCar/SÃO CARLOS, SP.; RODRIGO GIGLIOTI, UNICEP/SÃO CARLOS, SP.; CAMILA O. CARVALHO, UFSCAR/SÃO CARLOS, SP. |
|
Título: |
Ação de extrato de Neem sobre Rhipicephalus ( Boophilus micropulus) com azadirachtina - A quantificada por HPLC. |
|
Ano de publicação: |
2007 |
|
Fonte/Imprenta: |
In: REUNION ASOCIACION LATINOAMERICANA DE PRODUCCION ANIMAL, 20.; REUNION ASOCIACION PERUANA DE PRODUCCION ANINAL, 30.; CONGRESSO INTERNACIONAL DE GANDEIRA DE DOBLE PROPOSTO, 5., 2007, Cuzco, Perú. Annales... Cuzco: ALPA: APPA, 2007. |
|
Descrição Física: |
1 CD-ROM. |
|
Idioma: |
Português |
|
Notas: |
Resumo na seguinte fonte: Archivos Latinoamericano de Produccion Animal, v. 15, (supl.), p. 489, 2007 |
|
Conteúdo: |
Uso de vermifugações seletivas no controle dos nematódeos gastrintestinais foi testado em 115 ovelhas sem raça definida (SRD) e 124 cordeiros ½ SRD/Dorper (DO), ½ SRD/Santa Inês (SI) e ½ SRD/Suffolk (SF). Amostras de fezes foram obtidas de maio/2006 a maio de /2007, para contagem de ovos de nematódeos por grama de fezes (OPG) e coprocultura. Anti-helmínticos (albendazol) foram administrados individualmente às fêmeas no periparto e cordeiros com o OPG acima de 4000 ovos por grama. Os principais gêneros de nematódeos gastrintestinais encontrados foram Haemonchus spp.(65%) e Trichostrongylus spp.(34%). As médias de OPG das fêmeas adultas foi influenciado principalmente pelo mês da coleta (p<0,0001). As médias de OPG para os cordeiros foram de 3,4, 4,2 e 4,2 para as raças DO, SI e SF, respectivamente. O número de animais tratados foi respectivamente, 17; 3; 0; 1; 0; 6; 5; 22; 9; 8; 11; 1 e 1 para maio de 2006 a maio de 2007. |
|
Palavras-Chave: |
Haemonchus spp; Nematódeos gastrintestinais; Ovinos; Trichostrongylus spp. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPPSE/17370/1/PROCIMCSO2007.00304.pdf
|
|
Marc: |
LEADER 01946nam a2200241 a 4500
001 1048197
005 2011-08-24
008 2007 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA, M. C. de S.
245 $aAção de extrato de Neem sobre Rhipicephalus ( Boophilus micropulus) com azadirachtina - A quantificada por HPLC.
260 $aIn: REUNION ASOCIACION LATINOAMERICANA DE PRODUCCION ANIMAL, 20.; REUNION ASOCIACION PERUANA DE PRODUCCION ANINAL, 30.; CONGRESSO INTERNACIONAL DE GANDEIRA DE DOBLE PROPOSTO, 5., 2007, Cuzco, Perú. Annales... Cuzco: ALPA: APPA$c2007
300 $c1 CD-ROM.
500 $aResumo na seguinte fonte: Archivos Latinoamericano de Produccion Animal, v. 15, (supl.), p. 489, 2007
520 $aUso de vermifugações seletivas no controle dos nematódeos gastrintestinais foi testado em 115 ovelhas sem raça definida (SRD) e 124 cordeiros ½ SRD/Dorper (DO), ½ SRD/Santa Inês (SI) e ½ SRD/Suffolk (SF). Amostras de fezes foram obtidas de maio/2006 a maio de /2007, para contagem de ovos de nematódeos por grama de fezes (OPG) e coprocultura. Anti-helmínticos (albendazol) foram administrados individualmente às fêmeas no periparto e cordeiros com o OPG acima de 4000 ovos por grama. Os principais gêneros de nematódeos gastrintestinais encontrados foram Haemonchus spp.(65%) e Trichostrongylus spp.(34%). As médias de OPG das fêmeas adultas foi influenciado principalmente pelo mês da coleta (p<0,0001). As médias de OPG para os cordeiros foram de 3,4, 4,2 e 4,2 para as raças DO, SI e SF, respectivamente. O número de animais tratados foi respectivamente, 17; 3; 0; 1; 0; 6; 5; 22; 9; 8; 11; 1 e 1 para maio de 2006 a maio de 2007.
653 $aHaemonchus spp
653 $aNematódeos gastrintestinais
653 $aOvinos
653 $aTrichostrongylus spp
700 1 $aCHAGAS, A. C. de S.
700 1 $aFORIM, M.
700 1 $aSILVA, M. F.
700 1 $aGIGLIOTI, R.
700 1 $aCARVALHO, C. O.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
