How do I combine the values of cells for 3 rasters for cells where they overlap. I want the output raster to cover only the area of the overlap for the 3 rasters and the output cell values to be a sum of the values of the 3 original rasters.
I am using arcmap 10.2. If this is possible through raster calculator it will be preferable. Or any of the spatial analyst tools
2 Answers 2
Raster Calculator can do this -- indeed, the example illustration on the help page shows exactly what you want to do. The resulting raster will only cover the overlap area, which I often find problematic for my analyses but sounds like what you need.
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Other options would work but are more complex than you need. The Plus tool only adds two rasters at a time and would involve running the tool twice. The Weighted Sum tool could work if you assign a weight of 1 to all the rasters. I'd just stick with Raster Calculator.
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Thank you all. What about nodata, I hope nodata values are ignored in the calculation?veesilouette– veesilouette2014年12月01日 17:51:17 +00:00Commented Dec 1, 2014 at 17:51
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The tool to do this is called cell statistics
Select the option SUM
In the environments setting (Output Extent) set the output extent to intersect
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Yes, I'd forgotten about Cell Statistics :)Erica– Erica2014年12月01日 18:41:23 +00:00Commented Dec 1, 2014 at 18:41