Surface
interpolations are easily influenced by the method used based on the
consistency of sampling and the extremes of the data. Certain methods of interpolation
are more accurate if there is a consistent plane (Spline) while inconsistent
data works best with the IDW interpretation. Data points used in the Thiessen
approach can give more accurate statistics, though the maps produced are not as
helpful as the other interpolation methods. The image above demonstrates the Spline Tension method.
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