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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
26/02/1993 |
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Data da última atualização: |
26/02/1993 |
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Autoria: |
YATES, S. R.; WARRICK, A. W.; MATTHIAS, A. D.; MUSIL, S. |
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Título: |
Spatial variability of remotely sensed surface temperatures at field scale. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Soil Science Society American Journal, v.52, p.40-45, 1988. |
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Idioma: |
Inglês |
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Conteúdo: |
Bare soil surface temperatures (BST) and crop canopy temperatures (CCT) were collected from a 1-ha field in central Arizona using an infrared thermometer to determine whether they were spatially correlated. The measurements were taken from a two-dimensional random sampling pattern for selected dates and times to investigate the spatial and temporal distribution. Three measures of the correlation distance including two integral scales were calculated. Kriging, which produces the best linear unbiased estimator, was used to show the spatial pattern of the BST and CCT in the field on selected dates. the results indicate that the BST and CCT are spatially dependent random fumctions with integralscales that varied from 2 to l5 m for wet and dry conditions,respectively. The autocorrelation as the lagged distance approaches zero was greater than 0.4 except under wet soil conditions, where the autocorrelation for the CCT was found to be lower. The results are important because, to date, no geostatistical study has shown that the CCTis a spatially dependent random function. |
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Palavras-Chave: |
Escala integral; Geoestatistica; Integral scales; Semivariogram; Semivariograma. |
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Thesaurus Nal: |
geostatistics; kriging. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01738naa a2200241 a 4500
001 1073039
005 1993-02-26
008 1988 bl --- 0-- u #d
100 1 $aYATES, S. R.
245 $aSpatial variability of remotely sensed surface temperatures at field scale.
260 $c1988
520 $aBare soil surface temperatures (BST) and crop canopy temperatures (CCT) were collected from a 1-ha field in central Arizona using an infrared thermometer to determine whether they were spatially correlated. The measurements were taken from a two-dimensional random sampling pattern for selected dates and times to investigate the spatial and temporal distribution. Three measures of the correlation distance including two integral scales were calculated. Kriging, which produces the best linear unbiased estimator, was used to show the spatial pattern of the BST and CCT in the field on selected dates. the results indicate that the BST and CCT are spatially dependent random fumctions with integralscales that varied from 2 to l5 m for wet and dry conditions,respectively. The autocorrelation as the lagged distance approaches zero was greater than 0.4 except under wet soil conditions, where the autocorrelation for the CCT was found to be lower. The results are important because, to date, no geostatistical study has shown that the CCTis a spatially dependent random function.
650 $ageostatistics
650 $akriging
653 $aEscala integral
653 $aGeoestatistica
653 $aIntegral scales
653 $aSemivariogram
653 $aSemivariograma
700 1 $aWARRICK, A. W.
700 1 $aMATTHIAS, A. D.
700 1 $aMUSIL, S.
773 $tSoil Science Society American Journal$gv.52, p.40-45, 1988.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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