When do we need a trend model in kriging? |
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| Authors: | A G Journel and M E Rossi |
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| Institution: | (1) Department of Applied Earth Sciences, Stanford University, 94305 Stanford, California |
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| Abstract: | Under usual estimation practice with local search windows for data and for interpolation situations, universal kriging and ordinary kriging yield the same estimates, using a data set with apparent trend, for both the unknown attribute and its trend component. Modeling the trend matters only in extrapolation situations. Because conditions of the case study presented arise most frequently in practice, the simpler ordinary kriging is the preferred option. |
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| Keywords: | universal kriging ordinary kriging dual kriging trend model interpolation extrapolation |
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