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How do I average a set of rasters? I have remotely sensed chlorophyll a rasters for several days and I need to get an average of the days represented as one raster layer. I've got QGIS 18.0 with the RasterCalc plugin as well as ArcMap 9.2. Any advice greatly appreciated!

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in ArcMap 9.2 using the Raster calculator (Spatial Analyst).

for five raster files:

( [raster1]+[raster2]+[raster3]+[raster4]+[raster5] )/5
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The syntax in the raster calculator in QGIS is also pretty much similar. –  Devdatta Tengshe Dec 27 '12 at 11:48
    
Thanks so much, I thought I had tried that but must have been typing something wrong! All sorted now :) –  Georgia French Jan 4 '13 at 8:12
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