I've converted "Polygons to Raster" so I can perform a spline, but I can't git the raster as in input on "Spline" without Error 000840. Tracking down other solutions, I tried to "Make Feature Layer" from a .lyr file I made for the Raster, and that too has a Error 000840.

Any ideas on what I'm missing to get it all to fit in the Spline tool?


Spline interpolation requires point feature class as an input to do interpolation. You can not use polygon or raster (as mentioned in you question) as an input to the spline tool. You need to have point data with z_field (numeric field).

  • Only calculates from point features to GENERATE a raster. My Bad. – YAtreyu Apr 27 '16 at 6:14

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