Abstract
iksim is a fast program for indicator kriging and simulation of continuous or categorical variables in the presence of inequality constraints, hard and soft data. The speed advantage of iksim program results from the FFT spectral simulation of the non-conditional p-field. To maintain the full speed of median IK in the presence of missing indicator values corresponding to constraint intervals or soft data, the missing values can be reconstructed using the marginal z-distribution. The algorithm, program structure, data file formats, parameter file, and some validation checks are presented.
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