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I have been struggling to extrapolate beyond the extent of the point features input into the IDW tool of ArcGIS Pro.

I believe IDW interpolation is the method for me, i just need the process to extend beyond the input points slightly to fit a bigger area.

Specifying a mask in the environment settings seems only to clip the same extent (that is that of the input points), to the mask.

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It appears you cannot extrapolate using IDW interpolation. Spline was a sufficient substitute and can be extrapolated.

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