Q:

Emulating ArcGIS Highest Position tool in QGIS?

I am familiar with the tool Highest Position (Spatial Analyst) in Arcgis, but I am trying to replicate this tools function is QGIS. Is anyone aware if this tool exist in QGIS (possibly under a different name)? I have tried looking but no luck yet. Below is a description of what the tool does in Arcgis.

So the way the Highest Position Tool works in Arcgis is as follows:

The order that you added your raster is important for the output:
When I add InRas1 to the tool, it is my first input for my stack of rasters. The tool assigns this raster the value of 1
When I add InRas2 to the tool, it is my 2nd input for my stack of rasters. The tool assigns this raster the value of 2
When I add InRas3 to the tool, it is my third input for my stack of rasters. The tool assigns this raster the value of 3.
When the Highest Position tool is run, it is looking at over laying pixels to determine the highest value. In this example I will use the bottom left pixel of inputs InRas1, InRas2 and InRas3. From the illustration, InRas1 has the highest value of 4 and so in the output raster (outRas), the tool assigns that pixel a value of 1 (as this was the first raster in putted into my raster stack. See point 2 above)

A:

You could use the raster Calculator something like
(raster1>raster2>raster3)*1 OR  (raster1>raster3>raster2)*1 OR (raster2>raster3>raster1)*2 OR  (raster2>raster1>raster3)*2 OR (raster3>raster2>raster1)*3 OR (raster3>raster1>raster2)*3

