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FAQ: Can the confidence error of an IDW interpolated raster be calculated?

Question

Can the confidence error of an IDW interpolated raster be calculated?

Answer

No; IDW is a deterministic interpolation. Deterministic approaches do not have any way of calculating a confidence surface. These techniques analyze the neighbors and predict a value.

Compare this to Kriging, a geostatistical approach based on probability. From probability, a confidence surface can be created.