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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
23/08/2016 |
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Data da última atualização: |
12/08/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CHAGAS, C. da S.; CARVALHO JUNIOR, W. de; BHERING, S. B.; CALDERANO FILHO, B. |
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Afiliação: |
CESAR DA SILVA CHAGAS, CNPS; WALDIR DE CARVALHO JUNIOR, CNPS; SILVIO BARGE BHERING, CNPS; BRAZ CALDERANO FILHO, CNPS. |
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Título: |
Spatial prediction of soil surface texture in a semiarid region using random forest and multiple linear regressions. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Catena, v. 139, p. 232-240, Apr. 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
Soil texture is an essential and extremely variable physical property that strongly influences many other soil properties that are highly relevant for agricultural production, e.g., fertility and water retention capacity. In plain areas, terrain properties derived from a digital elevation model are not effective for digital soil mapping, and the variation in the properties of such areas remains a challenge. In this regard, remote sensing can facilitate the mapping of soil properties. The purpose of this study was to evaluate the efficiency of using of data obtained fromthe ThematicMapper (TM) sensor of Landsat 5 for digital soil mapping in a semi-arid region, based on multiple linear regression (MLR) and a random forest model (RFM). To this end, 399 samples of the soil surface layer (0?20 cm)were used to predict the sand, silt and clay contents, using the bands 1, 2, 3, 4, 5 and 7, the Normalized Difference Vegetation Index (NDVI), the grain size index (GSI), and the relationships between bands 3 and 2, bands 3 and 7, and bands 5 and 7 (clay index) of the Landsat 5 TM sensor as covariates. Among these covariates, only band 1 (b1), the relationship between bands 5 and 7 (b5/b7) for sand, silt and clay, and band 4 (b4) for silt were not significantly correlated according to Pearson's correlation analysis. The validation of the models showed that the properties were best estimated using the RFM, which explained 63% and 56% of the spatial variability of sand and clay, respectively, whereas the MLR explained 30% of the spatial variation of silt. An analysis of the relevance of the variables predicted by the RFMshowed that the covariates b3/b7, b5, NDVI and b2 explained most of the variability of the considered properties. The RFM proved to be more advantageous than the MLR with respect to insensitivity to overfitting and the presence of noise in the data. In addition, the RFMproduced more realistic distribution maps of the soil properties than did the MLR, taking into account that the estimated values of the soil attributes were in the same range as the calibration data, while theMLR model estimates were out of the range of the calibration data. MenosSoil texture is an essential and extremely variable physical property that strongly influences many other soil properties that are highly relevant for agricultural production, e.g., fertility and water retention capacity. In plain areas, terrain properties derived from a digital elevation model are not effective for digital soil mapping, and the variation in the properties of such areas remains a challenge. In this regard, remote sensing can facilitate the mapping of soil properties. The purpose of this study was to evaluate the efficiency of using of data obtained fromthe ThematicMapper (TM) sensor of Landsat 5 for digital soil mapping in a semi-arid region, based on multiple linear regression (MLR) and a random forest model (RFM). To this end, 399 samples of the soil surface layer (0?20 cm)were used to predict the sand, silt and clay contents, using the bands 1, 2, 3, 4, 5 and 7, the Normalized Difference Vegetation Index (NDVI), the grain size index (GSI), and the relationships between bands 3 and 2, bands 3 and 7, and bands 5 and 7 (clay index) of the Landsat 5 TM sensor as covariates. Among these covariates, only band 1 (b1), the relationship between bands 5 and 7 (b5/b7) for sand, silt and clay, and band 4 (b4) for silt were not significantly correlated according to Pearson's correlation analysis. The validation of the models showed that the properties were best estimated using the RFM, which explained 63% and 56% of the spatial variability of sand and clay, respective... Mostrar Tudo |
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Palavras-Chave: |
Composição granulométrica; Conjunto de dados Landsat; Mapeamento digital de solos; Pedometria; Tamanho do grão. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02879naa a2200217 a 4500
001 2051511
005 2020-08-12
008 2016 bl uuuu u00u1 u #d
100 1 $aCHAGAS, C. da S.
245 $aSpatial prediction of soil surface texture in a semiarid region using random forest and multiple linear regressions.$h[electronic resource]
260 $c2016
520 $aSoil texture is an essential and extremely variable physical property that strongly influences many other soil properties that are highly relevant for agricultural production, e.g., fertility and water retention capacity. In plain areas, terrain properties derived from a digital elevation model are not effective for digital soil mapping, and the variation in the properties of such areas remains a challenge. In this regard, remote sensing can facilitate the mapping of soil properties. The purpose of this study was to evaluate the efficiency of using of data obtained fromthe ThematicMapper (TM) sensor of Landsat 5 for digital soil mapping in a semi-arid region, based on multiple linear regression (MLR) and a random forest model (RFM). To this end, 399 samples of the soil surface layer (0?20 cm)were used to predict the sand, silt and clay contents, using the bands 1, 2, 3, 4, 5 and 7, the Normalized Difference Vegetation Index (NDVI), the grain size index (GSI), and the relationships between bands 3 and 2, bands 3 and 7, and bands 5 and 7 (clay index) of the Landsat 5 TM sensor as covariates. Among these covariates, only band 1 (b1), the relationship between bands 5 and 7 (b5/b7) for sand, silt and clay, and band 4 (b4) for silt were not significantly correlated according to Pearson's correlation analysis. The validation of the models showed that the properties were best estimated using the RFM, which explained 63% and 56% of the spatial variability of sand and clay, respectively, whereas the MLR explained 30% of the spatial variation of silt. An analysis of the relevance of the variables predicted by the RFMshowed that the covariates b3/b7, b5, NDVI and b2 explained most of the variability of the considered properties. The RFM proved to be more advantageous than the MLR with respect to insensitivity to overfitting and the presence of noise in the data. In addition, the RFMproduced more realistic distribution maps of the soil properties than did the MLR, taking into account that the estimated values of the soil attributes were in the same range as the calibration data, while theMLR model estimates were out of the range of the calibration data.
653 $aComposição granulométrica
653 $aConjunto de dados Landsat
653 $aMapeamento digital de solos
653 $aPedometria
653 $aTamanho do grão
700 1 $aCARVALHO JUNIOR, W. de
700 1 $aBHERING, S. B.
700 1 $aCALDERANO FILHO, B.
773 $tCatena$gv. 139, p. 232-240, Apr. 2016.
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Registro original: |
Embrapa Solos (CNPS) |
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Registro |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
09/03/2020 |
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Data da última atualização: |
12/12/2023 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SILVA, A. B. S.; FERRY, G. R. A.; MATA, A. C. V.; LOPES, M. T. do R.; PEREIRA, F. de M.; SOUZA, B. de A. |
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Afiliação: |
ANA BEATRIZ SOUSA SILVA, UFPI; GABRIELA RODRIGUES ALENCAR FERRY, UFPI; ALANDERSON CARLOS VIEIRA MATA, UFPI; MARIA TERESA DO REGO LOPES, CPAMN; FABIA DE MELLO PEREIRA, CPAMN; BRUNO DE ALMEIDA SOUZA, CPAMN. |
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Título: |
Efeito do sombreamento sobre a variação de temperatura em colmeias de Melipona fasciculata Smith, 1854, em Teresina, PI. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
In: JORNADA DE INICIAÇÃO CIENTÍFICA DA EMBRAPA MEIO-NORTE, 4., 2018, Teresina, PI. Anais da IV Jornada Científica da Embrapa Meio-Norte. Brasília, DF: Embrapa, 2018. |
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Páginas: |
p. 35. |
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Idioma: |
Português |
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Conteúdo: |
O objetivo principal foi avaliar a temperatura de colmeias instaladas em diferentes condições de sombreamento natural, no início do período seco. Este trabalho foi realizado no meliponário da Embrapa Meio-Norte, em Teresina, PI (5º02'12,9"S e 42º47'55,7"W). |
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Palavras-Chave: |
Abelha-sem-ferrão; Conforto térmico; Tiúba. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/211608/1/Quarta-Jornada-Cientifica-2018-3-00033.pdf
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Marc: |
LEADER 01062nam a2200217 a 4500
001 2121030
005 2023-12-12
008 2018 bl uuuu u00u1 u #d
100 1 $aSILVA, A. B. S.
245 $aEfeito do sombreamento sobre a variação de temperatura em colmeias de Melipona fasciculata Smith, 1854, em Teresina, PI.$h[electronic resource]
260 $aIn: JORNADA DE INICIAÇÃO CIENTÍFICA DA EMBRAPA MEIO-NORTE, 4., 2018, Teresina, PI. Anais da IV Jornada Científica da Embrapa Meio-Norte. Brasília, DF: Embrapa$c2018
300 $ap. 35.
520 $aO objetivo principal foi avaliar a temperatura de colmeias instaladas em diferentes condições de sombreamento natural, no início do período seco. Este trabalho foi realizado no meliponário da Embrapa Meio-Norte, em Teresina, PI (5º02'12,9"S e 42º47'55,7"W).
653 $aAbelha-sem-ferrão
653 $aConforto térmico
653 $aTiúba
700 1 $aFERRY, G. R. A.
700 1 $aMATA, A. C. V.
700 1 $aLOPES, M. T. do R.
700 1 $aPEREIRA, F. de M.
700 1 $aSOUZA, B. de A.
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