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 am using ArcMap 9.2.

2 Answers 2


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

for five raster files:

( [raster1]+[raster2]+[raster3]+[raster4]+[raster5] )/5
  • 5
    The syntax in the raster calculator in QGIS is also pretty much similar. Dec 27, 2012 at 11:48
  • Thanks so much, I thought I had tried that but must have been typing something wrong! All sorted now :) Jan 4, 2013 at 8:12

I can confirm that the Raster Calculator resulted in the solution I was looking for. I've attached an image of the tool for reference. Thank you![Example of Raster Calculator]1

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