Indicator Kriging Equations
Assuming that there are N effective sample points in a spatial region D, and there are n effective sample points in a range
within the D range,
, we can obtain the indicator function of the samples after setting up a threshold value. The estimator of 
could be presented as:
Given a series of threshold values
, the equation will be modified as:
For obtaining
and calculating the weight coefficient 
under the conditions of satisfying unbais and minimum estimated variance, we need to solve the following Indicator Kriging equations:
The variance 
of the Indicator Kriging is presented as:
The equation of covariance is:
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