I'm trying to do an IDW interpolation with QGIS tool.
But i'm really surprised by results. Interpolation values aren't similar as shape values.
I used a power of 0.2 to get a smooth raster.
Somebody have an idea ?
If I understand correctly, The histogram shows correct range of the data. But you have selected cumulative count cut in style manager, that's why by default min 2% and max 2% have been truncated from the range. Choose the min/max option to see the whole range in the legend as well as map.