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.

  • In the environment option you can define "processing extent" and then in the "raster analysis" choose your mask too. In this way the IDW will result in what you need. I just tried it and it worked. Aug 25, 2021 at 13:31

1 Answer 1


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

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