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The SAGA Raster Calculator within QGIS produces wrong results probably due to interpolation but works corretly withion SAGA itself. The problem has been discussed here before but sofar I have not found any useful solution. see also: Why does SAGA raster calculator interpolate between cell values? Raster calculators in SAGA return incorrect results). Why does interpolation (?) occur and how can it be avoided? I need the raster calculation to be performed within a QGIS python script.

  • You should maybe check on mixed projection issues ? – gisnside Sep 5 '16 at 14:24
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    Not the case. The two rasters are two different bands from the same landsat scene, so even within wrong projections there should not be any projection issue. – Matthias Sep 9 '16 at 14:41

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