Variogram Tutorial - Golden Software

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Variogram Tutorial Golden Software , Inc. 1 Variogram Tutorial Randal Barnes Golden Software , Inc. Variogram Tutorial Golden Software , Inc. 2 Table of Contents 1 Introduction 3 2 What does a Variogram represent? 4 3 What is a Variogram ? 6 4 The Variogram grid 7 5 Modeling the omni-directional Variogram 9 6 Modeling the Variogram anisotropy 12 7 Rules of thumb 15 8 Frequently asked questions 16 9 Some geostatistical references 21 Variogram Tutorial Golden Software , Inc. 3 1 Introduction The Variogram characterizes the spatial continuity or roughness of a data set. Ordinary one-dimensional statistics for two data sets may be nearly identical, but the spatial continuity may be quite different. Refer to Section 2 for a partial justification of the Variogram . Variogram analysis consists of the experimental Variogram calculated from the data and the Variogram model fitted to the data.

Variogram Tutorial Golden Software, Inc. 6 3 What is a variogram? The mathematical definition of the variogram is (3.1) where Z(x,y) is the value of the variable of interest at location (x, y), and e [ ] is the statistical expectation operator.

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