1992
DOI: 10.2136/sssaj1992.03615995005600050018x
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Estimation of the Spatial Distribution of Soil Chemicals Using Pseudo-Cross-Variograms

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Cited by 39 publications
(18 citation statements)
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“…IMPROVING MAP ACCURACY OF SOIL VARIABLES where RMSE k and RMSE ck are the root mean square errors of kriging and cokriging, respectively (adapted from Zhang et al, 1992). These findings were comparable to the observations by Yates and Warrick (1987), which found that a reduction in kriging variance is observed as the correlation between the covariate and target variable increased.…”
Section: Quantitative Resultssupporting
confidence: 53%
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“…IMPROVING MAP ACCURACY OF SOIL VARIABLES where RMSE k and RMSE ck are the root mean square errors of kriging and cokriging, respectively (adapted from Zhang et al, 1992). These findings were comparable to the observations by Yates and Warrick (1987), which found that a reduction in kriging variance is observed as the correlation between the covariate and target variable increased.…”
Section: Quantitative Resultssupporting
confidence: 53%
“…It is hypothesized that the benefit of cokriging was not observed because of the random choice of fifteen points or because semivariogram and cross-variogram models were not well defined with such few sample pairs at a low density (n = 15). Absolute values of RMSE were generally higher and correlation between predicted and actual values were generally lower with the lower sampling density, as also shown by Zhang et al (1992) (Table 3).…”
Section: Sampling Density Comparisonsupporting
confidence: 52%
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“…Cokriging (COK) is a multivariate extension of OK to the situations where one or more secondary variables are spatially cross-correlated with the primary variable. In such cases, the readily available secondary information is used to improve the quality of soil properties estimates (Yates & Warrick 1987;Zhang et al 1992Zhang et al , 1997Vaughan et al 1995;Gotway & Hartford 1996;Juang & Lee 1998). For example, Ersahin (2003) compared OK and COK for estimating the infiltration rate.…”
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confidence: 99%
“…Geostatistics, especially kriging, has been used widely in soil nutrient studies (Burrough, 1983;Zhang et al, 1992;Cambardella et al, 1994;Yanai et al, 2003;Gallardo, 2003;Ouyang et al, 2006). Cokriging is an extended technique of kriging.…”
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confidence: 99%