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https://issues.apache.org/jira/browse/MATH-1202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320055#comment-14320055
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Gilles commented on MATH-1202:
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In order to extrapolate, you need additional information that is not part of
the _definition_ of the interpolation algorithm.
If you can provide the information, you can thus extend the interpolation
domain with it, and then perform the interpolation.
> PiecewiseBicubicSplineInterpolatingFunction - allow to extrapolate
> ------------------------------------------------------------------
>
> Key: MATH-1202
> URL: https://issues.apache.org/jira/browse/MATH-1202
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.4.1
> Reporter: dmitry dementiev
> Labels: interpolation
>
> PiecewiseBicubicSplineInterpolatingFunction is not able to interpolate if the
> value we want to calculate is out of the points/values. Other libs provide
> functionality to make some extrapolation.
> In geospatial analysis, for example it is a must have feature, because the
> locations of points and values are almost always not at the border of the
> shape that we want to interpolate.
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