[Qgis-user] Raster Calculator Miscalculations - User error or bug?

[yoel flores]

Utilizar la herramienta SCP, dentro de ella, reproyectar bandas raster

El mar, 3 de mar de 2026, 12:02 p. m., Burley, James (ASC/CSA) via
QGIS-User <qgis-user at lists.osgeo.org> escribió:

> NON CLASSIFIÉ / UNCLASSIFIED
>
> Hello to the QGIS user’s community,
>
>
>
> I’m a planetary scientist working for the Canadian Space Agency who is
> working with lunar south pole data. I’m struggling with an issue when
> running a simple multiplication raster calculation that I’ve included below
> (sorry for vague layer names, data is not public):
>
>
>
> “Layer1” * “Layer2” * “Layer3” * “Layer4” * “Layer5” * “Layer6”
>
>
>
> The output raster is set to the spatial resolution of the highest
> resolution layer, as I’m trying to gather contextual data from coarser
> datasets at very specific locations.
>
>
>
> Most cells are calculated correctly, but many cells (<10-20%) are
> miscalculated to the tune of 10-30% of the expected value (sometime values
> are calculated lower than they should be, sometimes higher. Even when the
> highest spatial resolution cell is fully contained within a single cell in
> all other layers (no overlapping cell boundaries that might lead to
> different resampling values under a nearest neighbour protocol), the
> calculated value can still be incorrect.
>
>
>
> I’m running QGIS 3.44.7, my system is using an i7-1265U with 32 gb of ram.
> The rasters are large, 5000x5000 cell 32-bit float Geotiffs. All are using
> the same coordinate system (ESRI:103878 -
> Moon_2000_South_Pole_Stereographic).
>
>
>
> I’ve exported the input layers so I can run the same calculation in
> ArcPro, and the cells are all calculated correctly. Not sure if that helps
> narrow down the issue.
>
>
>
> Cheers,
>
> James
>
>
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