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I performed the difference between two images, 2010-2000, with the command in Arcmap10: Image Analysis and raster difference,based on the pixel value difference in the two image tables (2010, 2000). The pixel value in each image represents the land cover aggregated class, with 6 class at all, and I need to represent the change value in the table of the output image as a combination of the single values in the two original images, ex: image 2000 pixel value=1; image 2010 pixel value=3, the pixel value of the output image should be: value= 13, which means that the land cover classes changed from 1 in 2000 to 3 in 2010.

How can I remap the pixel value in the output table like that?

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    This is basic raster calculator raster1*10+raster2, but what you really need is Combine tool. Run it and you'll see what it does – FelixIP Sep 21 '16 at 0:18
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If you need to deal with NoData pixels you could use the Raster Calculator Tool and enter the following expression :

Con(IsNull("Raster2000"),0,"Raster2000" * 10) +  
Con(IsNull("Raster2010"),0,"Raster2010")

That would create an output of all possible land use change combinations including the pixels that changed from NoData to a land use and vice versa.

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  • Many thanks, I will try the formula with Raster calculator tool. – daniela mattina Sep 21 '16 at 8:46
  • Glad I could help! – FSimardGIS Sep 21 '16 at 11:56

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