Here's a sample of my dataset (one cell) with 28 different raster values, representing 28 individual Float32 rasters with identical parameters.

0.0000264434,   0.0049953502,   0.0007529828,   0.0002075955,   0.0000516699972,    0.0000000000,   0.0053563155,   0.0000000000,   0.0000000000,   0.0073998945,   0.0000804775,   0.0000000000,   0.0000387653,   0.0000000000,   0.0000000000,   0.0000000000,   0.0000000000,   0.0000000000,   0.0007369027,   0.0000519922,   0.0053393530,   0.0000000000000,    0.0000000000000,    0.0000000000000,    0.0000808992875,    0.0000000000000,    0.0000000000000,    0.0000000000000,

Due to system overload when I run the algorithm in a modeler, I've split the process into 4 groups of 7 layers by order of appearence. Each subgroup does the summary correct in all the calculation algorithms, including both SAGA ones: Raster Calculator and Grids Sum. However, when I do the final summarization of the 4 rasters, It appears that the SAGA algorithms return a different result

  • Excel: 0.0251186417
  • GDAL_CALC: 0.0251186417
  • SAGA Raster Calculator: 0.060915395617485046
  • SAGA Grids Sum:0.0012134892167523503

It's worth noting that if if I run both SAGA algorithms in a standalone way on all 28 rasters, I get the correct result like excel, gdal.

I tried to look if the SAGA algorithms truncate the data somehow but it doesn't seem to be the problem.

Any ideas why this is happening?

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