Abstract:
:This paper discusses and illustrates the use of kriging techniques for estimating the spatial pattern of contaminants in environmental media, particularly soil. The assumptions underlying kriging are reviewed as are some advantages and disadvantages of the method. Lognormal kriging (kriging applied to logarithmic-transformed data) is illustrated using a set of radionuclide soil concentrations at a nuclear testing area on the Nevada Test Site. This example shows how lognormal kriging can be used to estimate average concentrations at points or for blocks of land, concentration contours over space, confidence bands about these contours, and radionuclide inventory in soil. The validity of kriging estimates depends on the accurate estimation and modeling of the spatial correlation structure of the phenomenon. Accuracy is especially important when lognormal kriging is used and estimates of means and their standard deviations are required in the original, untransformed scale. This paper illustrates the bias that can result when a changing correlation structure over space is ignored.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Gilbert RO,Simpson JCdoi
10.1007/BF00395842subject
Has Abstractpub_date
1985-06-01 00:00:00pages
113-35issue
2eissn
0167-6369issn
1573-2959journal_volume
5pub_type
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journal_title:Environmental monitoring and assessment
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