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I am trying to use the Grid (Interpolation) tool from Analysis Menu in QGIS 2.18 for a small set of very few, sparsely ditributed points (they are centroids of municipalities and the quantity is population potential). But for the radius parameters of IDW method, I can't define values more than 10000m. I wonder, is it on purpose or is it a bag on the code?

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Strange, using QGIS 2.18.2 (Win7 64-bit), the radius limit for me is 65000. However, you could also try accessing the same tool from the Processing Toolbox and see if the radius limit there lets you go above 10000:

Grid tools

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    You can actually manually edit the GDAL commands. So there is the pen next to the text at the bottom, where you could manually enter another value. – HeikkiVesanto Apr 6 '17 at 10:06
  • @Vesanto - Thanks, good point! I tend to overlook the pencil... :) – Joseph Apr 6 '17 at 10:08
  • @Joseph: I use Win10 64bit (upgraded from Win7). I know about the Processing Toolbox, but I use this for educational purposes and the procedure for this is a bit more complicated. Haven't tried though to check if the restriction is the same there.. – Nikos Tzelepis Apr 7 '17 at 10:41
  • @Vesanto: I tried that but it also doesn't let me put more than 10000! – Nikos Tzelepis Apr 7 '17 at 10:42
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I might be blind, but I cannot see the Grid Interpolation from the analysis menu nor from Raster -> interpolation -> interpolation Plugin:

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Thus, I am not sure what radius parameter of IDW are you talking about.

  • The tool the OP mentioned is part of the GdalTools plugin :). Perhaps it wasn't enabled? – Joseph Apr 6 '17 at 9:37

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