**Linear interpolation - Wikipedia**
https://en.wikipedia.org/wiki/Linear_interpolation

Accuracy. If a C 0 function is insufficient, for example if the process that has produced the data points is known to be smoother than C 0, it is common to replace linear interpolation with spline interpolation or, in some cases, polynomial interpolation.. Multivariate. Linear interpolation as described here is for data points in one spatial dimension. For two spatial dimensions, the …

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