Simple Kriging

There are several forms of kriging, all of them initially formulated for the estimation of a continuous, spatial attribute at an unsampled site, preferably inside the convex hull defined by the location of the data. Figure 2.1 illustrates the case for a two-dimensional point sampling. Although extrapolations outside the convex hull are possible, they are unreliable. This points out a significant difference between kriging and time series analysis wherein the interest lies in predictions beyond the time span containing the data.