Count values greater equal to sthg from multiple rasters at once pixelwise in QGIS

Question

I have 36 TIFF rasters for the same spot, overlapping 100% and having the same dimension.

My goal is to create a result raster where each pixel represents the number of values where a condition is fullfilled. For example using count, if value >= 5 then the algorithm should check the same pixel in each layer of the 36 rasters; then writes it. min should be 0 if no condition is fullfiled and maximum should be 36 if all layers fullfill the condition at same pixel.

Is there such algorithm or tool to do it in QGIS? I am using QGIS 3.28.

Answer 1

In Raster > Raster calculator, use the following formula:

("Raster1@1">5)  +  ("Raster2@1">5) + ... +  ("Raster36@1">5)

This will return a value between 0 and 36 for each pixel, with a contribution of 1 every time the condition is met on one raster's pixel.

Notes:

• Make sure to select all the raster layers before launching the Raster Calculator if you want them to appear in the Raster Bands
• Parenthesis are important otherwise it returns no result.