I tried to interpolate the mean average annual temperature to produce a "realistic" surface. In QGIS I used Raster-Interpolation-Interpolation. Both methods TIN and IDW did not deliver a "realistic" surface (e.g. compared to a good map in an atlas).
IDW (factor 3):
TIN (also showing the interpolation points):
Any hints how to get a "better, more realistic" interpolation?
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